diff --git a/wp-admin/css/install.css b/wp-admin/css/install.css
index c033ea5..86ec9f1 100644
--- a/wp-admin/css/install.css
+++ b/wp-admin/css/install.css
@@ -211,20 +211,16 @@ submit {
 	font-size: 18px;
 }
 
-#error-page {
+body.error-page {
 	margin-top: 50px;
 }
 
-#error-page p {
+body.error-page p {
 	font-size: 14px;
 	line-height: 18px;
 	margin: 25px 0 20px;
 }
 
-#error-page code, .code {
-	font-family: Consolas, Monaco, monospace;
-}
-
 .wp-hide-pw > .dashicons {
 	line-height: inherit;
 }
diff --git a/wp-admin/setup-config.php b/wp-admin/setup-config.php
index fd8d32b..04f060e 100644
--- a/wp-admin/setup-config.php
+++ b/wp-admin/setup-config.php
@@ -141,16 +141,24 @@ function setup_config_display_header( $body_classes = array() ) {
 			$step_1 .= '&language=' . $loaded_language;
 		}
 ?>
-<h1 class="screen-reader-text"><?php _e( 'Before getting started' ) ?></h1>
-<p><?php _e( 'Welcome to WordPress. Before getting started, we need some information on the database. You will need to know the following items before proceeding.' ) ?></p>
+<h1 class="screen-reader-text"><?php _e( 'Before getting started' ); ?></h1>
+<p><?php _e( "OK! We need some information about your database." ); ?></p>
+<p><?php _e( "This information is available through your web host. If you don't have it, you'll need to get in touch with them. Here's what you need:" ); ?></p>
 <ol>
 	<li><?php _e( 'Database name' ); ?></li>
 	<li><?php _e( 'Database username' ); ?></li>
 	<li><?php _e( 'Database password' ); ?></li>
 	<li><?php _e( 'Database host' ); ?></li>
-	<li><?php _e( 'Table prefix (if you want to run more than one WordPress in a single database)' ); ?></li>
 </ol>
 <p><?php
+	/* translators: 1: wp-config.php, 2: Codex URL */
+	printf( __( "Once you fill in this information, WordPress will create a configuration file called %1$s. This connects WordPress with your database, where your content and settings will be stored. Need more help? Check out our <a href='%2$s'>documentation</a>." ),
+		'<code>wp-config.php</code>',
+		__( 'https://codex.wordpress.org/Editing_wp-config.php' )
+	);
+?></p>
+<p><?php _e( "If you&#8217;re all ready&hellip;" ); ?></p>
+<p><?php
 	/* translators: %s: wp-config.php */
 	printf( __( 'We&#8217;re going to use this information to create a %s file.' ),
 		'<code>wp-config.php</code>'
@@ -171,7 +179,7 @@ function setup_config_display_header( $body_classes = array() ) {
 ?></p>
 <p><?php _e( 'In all likelihood, these items were supplied to you by your Web Host. If you don&#8217;t have this information, then you will need to contact them before you can continue. If you&#8217;re all ready&hellip;' ); ?></p>
 
-<p class="step"><a href="<?php echo $step_1; ?>" class="button button-large"><?php _e( 'Let&#8217;s go!' ); ?></a></p>
+<p class="step"><a href="setup-config.php?step=1<?php if ( isset( $_GET['noapi'] ) ) echo '&amp;noapi'; ?>" class="button button-large"><?php _e( 'Let&#8217;s Go!' ); ?></a></p>
 <?php
 	break;
 
@@ -244,14 +252,31 @@ function setup_config_display_header( $body_classes = array() ) {
 		$install .= '?language=en_US';
 	}
 
-	$tryagain_link = '</p><p class="step"><a href="' . $step_1 . '" onclick="javascript:history.go(-1);return false;" class="button button-large">' . __( 'Try again' ) . '</a>';
-
-	if ( empty( $prefix ) )
-		wp_die( __( '<strong>ERROR</strong>: "Table Prefix" must not be empty.' . $tryagain_link ) );
+	$tryagain_link = '</p><p class="step"><a href="setup-config.php?step=1" onclick="javascript:history.go(-1);return false;" class="button button-large">' . __( 'Try Again' ) . '</a>';
+
+	// Validate $prefix: it must not be empty
+	if ( empty( $prefix ) ) {
+		$die .= '<p style="text-align: center;">' . __( "Oops, the Table Prefix field can't be empty. Please go back and try again." ) . '</p>';
+		$die .= '<p style="text-align: center;">' . sprintf(
+			/* translators: %s: Codex URL */
+			__( "Need more help? Check out our <a href='%s'>documentation</a>." ),
+			__( 'https://codex.wordpress.org/Editing_wp-config.php#table_prefix' )
+		) . '</p>';
+		$die .= ( __( $tryagain_link ) );
+		wp_die( $die );
+	}
 
 	// Validate $prefix: it can only contain letters, numbers and underscores.
-	if ( preg_match( '|[^a-z0-9_]|i', $prefix ) )
-		wp_die( __( '<strong>ERROR</strong>: "Table Prefix" can only contain numbers, letters, and underscores.' . $tryagain_link ) );
+	if ( preg_match( '|[^a-z0-9_]|i', $prefix ) ) {
+		$die .= '<p style="text-align: center;">' . __( "Oops, the Table Prefix field can only contain numbers, letters, and underscores. Please go back and try again. ") . '</p>';
+		$die .= '<p style="text-align: center;">' . sprintf(
+			/* translators: %s: Codex URL */
+			__( "Need more help? Check out our <a href='%s'>documentation</a>." ),
+			__( 'https://codex.wordpress.org/Editing_wp-config.php#table_prefix' )
+		) . '</p>';
+		$die .= ( __( $tryagain_link ) );
+		wp_die( $die );
+	}
 
 	// Test the db connection.
 	/**#@+
@@ -343,7 +368,7 @@ function setup_config_display_header( $body_classes = array() ) {
 ?></p>
 <p><?php
 	/* translators: %s: wp-config.php */
-	printf( __( 'You can create the %s manually and paste the following text into it.' ), '<code>wp-config.php</code>' );
+	printf( __( 'To continue, manually create a file named %s in the root directory where the rest of your WordPress files are located and copy and paste the following text into the file:'), '<code>wp-config.php</code>' );
 ?></p>
 <textarea id="wp-config" cols="98" rows="15" class="code" readonly="readonly"><?php
 		foreach ( $config_file as $line ) {
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index bcd56f7..7be8371 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -2613,7 +2613,7 @@ function _default_wp_die_handler( $message, $title = '', $args = array() ) {
 			$message = "<ul>\n\t\t<li>" . join( "</li>\n\t\t<li>", $errors ) . "</li>\n\t</ul>";
 			break;
 		}
-	} elseif ( is_string( $message ) ) {
+	} elseif ( is_string( $message ) && empty( $r['raw'] ) ) {
 		$message = "<p>$message</p>";
 	}
 
@@ -2637,6 +2637,16 @@ function _default_wp_die_handler( $message, $title = '', $args = array() ) {
 			$text_direction = 'rtl';
 		elseif ( function_exists( 'is_rtl' ) && is_rtl() )
 			$text_direction = 'rtl';
+
+		$site_url = wp_guess_url();
+
+		$classes = 'wp-core-ui';
+		if ( ! empty( $r['error'] ) ) {
+			$classes .= ' error-page';
+		}
+		if ( 'rtl' === $text_direction ) {
+			$classes .= ' rtl';
+		}
 ?>
 <!DOCTYPE html>
 <!-- Ticket #11289, IE bug fix: always pad the error page with enough characters such that it is greater than 512 bytes, even after gzip compression abcdefghijklmnopqrstuvwxyz1234567890aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz11223344556677889900abacbcbdcdcededfefegfgfhghgihihjijikjkjlklkmlmlnmnmononpopoqpqprqrqsrsrtstsubcbcdcdedefefgfabcadefbghicjkldmnoepqrfstugvwxhyz1i234j567k890laabmbccnddeoeffpgghqhiirjjksklltmmnunoovppqwqrrxsstytuuzvvw0wxx1yyz2z113223434455666777889890091abc2def3ghi4jkl5mno6pqr7stu8vwx9yz11aab2bcc3dd4ee5ff6gg7hh8ii9j0jk1kl2lmm3nnoo4p5pq6qrr7ss8tt9uuvv0wwx1x2yyzz13aba4cbcb5dcdc6dedfef8egf9gfh0ghg1ihi2hji3jik4jkj5lkl6kml7mln8mnm9ono
@@ -2646,124 +2656,10 @@ function _default_wp_die_handler( $message, $title = '', $args = array() ) {
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 	<meta name="viewport" content="width=device-width">
 	<title><?php echo $title ?></title>
-	<style type="text/css">
-		html {
-			background: #f1f1f1;
-		}
-		body {
-			background: #fff;
-			color: #444;
-			font-family: "Open Sans", sans-serif;
-			margin: 2em auto;
-			padding: 1em 2em;
-			max-width: 700px;
-			-webkit-box-shadow: 0 1px 3px rgba(0,0,0,0.13);
-			box-shadow: 0 1px 3px rgba(0,0,0,0.13);
-		}
-		h1 {
-			border-bottom: 1px solid #dadada;
-			clear: both;
-			color: #666;
-			font: 24px "Open Sans", sans-serif;
-			margin: 30px 0 0 0;
-			padding: 0;
-			padding-bottom: 7px;
-		}
-		#error-page {
-			margin-top: 50px;
-		}
-		#error-page p {
-			font-size: 14px;
-			line-height: 1.5;
-			margin: 25px 0 20px;
-		}
-		#error-page code {
-			font-family: Consolas, Monaco, monospace;
-		}
-		ul li {
-			margin-bottom: 10px;
-			font-size: 14px ;
-		}
-		a {
-			color: #0073aa;
-		}
-		a:hover,
-		a:active {
-			color: #00a0d2;
-		}
-		a:focus {
-			color: #124964;
-		    -webkit-box-shadow:
-		    	0 0 0 1px #5b9dd9,
-				0 0 2px 1px rgba(30, 140, 190, .8);
-		    box-shadow:
-		    	0 0 0 1px #5b9dd9,
-				0 0 2px 1px rgba(30, 140, 190, .8);
-			outline: none;
-		}
-		.button {
-			background: #f7f7f7;
-			border: 1px solid #ccc;
-			color: #555;
-			display: inline-block;
-			text-decoration: none;
-			font-size: 13px;
-			line-height: 26px;
-			height: 28px;
-			margin: 0;
-			padding: 0 10px 1px;
-			cursor: pointer;
-			-webkit-border-radius: 3px;
-			-webkit-appearance: none;
-			border-radius: 3px;
-			white-space: nowrap;
-			-webkit-box-sizing: border-box;
-			-moz-box-sizing:    border-box;
-			box-sizing:         border-box;
-
-			-webkit-box-shadow: 0 1px 0 #ccc;
-			box-shadow: 0 1px 0 #ccc;
-		 	vertical-align: top;
-		}
-
-		.button.button-large {
-			height: 30px;
-			line-height: 28px;
-			padding: 0 12px 2px;
-		}
-
-		.button:hover,
-		.button:focus {
-			background: #fafafa;
-			border-color: #999;
-			color: #23282d;
-		}
-
-		.button:focus  {
-			border-color: #5b9dd9;
-			-webkit-box-shadow: 0 0 3px rgba( 0, 115, 170, .8 );
-			box-shadow: 0 0 3px rgba( 0, 115, 170, .8 );
-			outline: none;
-		}
-
-		.button:active {
-			background: #eee;
-			border-color: #999;
-		 	-webkit-box-shadow: inset 0 2px 5px -3px rgba( 0, 0, 0, 0.5 );
-		 	box-shadow: inset 0 2px 5px -3px rgba( 0, 0, 0, 0.5 );
-		 	-webkit-transform: translateY(1px);
-		 	-ms-transform: translateY(1px);
-		 	transform: translateY(1px);
-		}
-
-		<?php
-		if ( 'rtl' == $text_direction ) {
-			echo 'body { font-family: Tahoma, Arial; }';
-		}
-		?>
-	</style>
+	<link rel="stylesheet" type="text/css" href="<?php echo $site_url; ?>/wp-admin/css/install.css" />
+	<link rel="stylesheet" type="text/css" href="<?php echo $site_url; ?>/wp-includes/css/buttons.css" />
 </head>
-<body id="error-page">
+<body class="<?php echo $classes; ?>">
 <?php endif; // ! did_action( 'admin_head' ) ?>
 	<?php echo $message; ?>
 </body>
diff --git a/wp-includes/functions.php.orig b/wp-includes/functions.php.orig
new file mode 100644
index 0000000..bcd56f7
--- /dev/null
+++ b/wp-includes/functions.php.orig
@@ -0,0 +1,5277 @@
+<?php
+/**
+ * Main WordPress API
+ *
+ * @package WordPress
+ */
+
+require( ABSPATH . WPINC . '/option.php' );
+
+/**
+ * Convert given date string into a different format.
+ *
+ * $format should be either a PHP date format string, e.g. 'U' for a Unix
+ * timestamp, or 'G' for a Unix timestamp assuming that $date is GMT.
+ *
+ * If $translate is true then the given date and format string will
+ * be passed to date_i18n() for translation.
+ *
+ * @since 0.71
+ *
+ * @param string $format    Format of the date to return.
+ * @param string $date      Date string to convert.
+ * @param bool   $translate Whether the return date should be translated. Default true.
+ * @return string|int|bool Formatted date string or Unix timestamp. False if $date is empty.
+ */
+function mysql2date( $format, $date, $translate = true ) {
+	if ( empty( $date ) )
+		return false;
+
+	if ( 'G' == $format )
+		return strtotime( $date . ' +0000' );
+
+	$i = strtotime( $date );
+
+	if ( 'U' == $format )
+		return $i;
+
+	if ( $translate )
+		return date_i18n( $format, $i );
+	else
+		return date( $format, $i );
+}
+
+/**
+ * Retrieve the current time based on specified type.
+ *
+ * The 'mysql' type will return the time in the format for MySQL DATETIME field.
+ * The 'timestamp' type will return the current timestamp.
+ * Other strings will be interpreted as PHP date formats (e.g. 'Y-m-d').
+ *
+ * If $gmt is set to either '1' or 'true', then both types will use GMT time.
+ * if $gmt is false, the output is adjusted with the GMT offset in the WordPress option.
+ *
+ * @since 1.0.0
+ *
+ * @param string   $type Type of time to retrieve. Accepts 'mysql', 'timestamp', or PHP date
+ *                       format string (e.g. 'Y-m-d').
+ * @param int|bool $gmt  Optional. Whether to use GMT timezone. Default false.
+ * @return int|string Integer if $type is 'timestamp', string otherwise.
+ */
+function current_time( $type, $gmt = 0 ) {
+	switch ( $type ) {
+		case 'mysql':
+			return ( $gmt ) ? gmdate( 'Y-m-d H:i:s' ) : gmdate( 'Y-m-d H:i:s', ( time() + ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ) ) );
+		case 'timestamp':
+			return ( $gmt ) ? time() : time() + ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
+		default:
+			return ( $gmt ) ? date( $type ) : date( $type, time() + ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ) );
+	}
+}
+
+/**
+ * Retrieve the date in localized format, based on timestamp.
+ *
+ * If the locale specifies the locale month and weekday, then the locale will
+ * take over the format for the date. If it isn't, then the date format string
+ * will be used instead.
+ *
+ * @since 0.71
+ *
+ * @global WP_Locale $wp_locale
+ *
+ * @param string   $dateformatstring Format to display the date.
+ * @param bool|int $unixtimestamp    Optional. Unix timestamp. Default false.
+ * @param bool     $gmt              Optional. Whether to use GMT timezone. Default false.
+ *
+ * @return string The date, translated if locale specifies it.
+ */
+function date_i18n( $dateformatstring, $unixtimestamp = false, $gmt = false ) {
+	global $wp_locale;
+	$i = $unixtimestamp;
+
+	if ( false === $i ) {
+		if ( ! $gmt )
+			$i = current_time( 'timestamp' );
+		else
+			$i = time();
+		// we should not let date() interfere with our
+		// specially computed timestamp
+		$gmt = true;
+	}
+
+	/*
+	 * Store original value for language with untypical grammars.
+	 * See https://core.trac.wordpress.org/ticket/9396
+	 */
+	$req_format = $dateformatstring;
+
+	$datefunc = $gmt? 'gmdate' : 'date';
+
+	if ( ( !empty( $wp_locale->month ) ) && ( !empty( $wp_locale->weekday ) ) ) {
+		$datemonth = $wp_locale->get_month( $datefunc( 'm', $i ) );
+		$datemonth_abbrev = $wp_locale->get_month_abbrev( $datemonth );
+		$dateweekday = $wp_locale->get_weekday( $datefunc( 'w', $i ) );
+		$dateweekday_abbrev = $wp_locale->get_weekday_abbrev( $dateweekday );
+		$datemeridiem = $wp_locale->get_meridiem( $datefunc( 'a', $i ) );
+		$datemeridiem_capital = $wp_locale->get_meridiem( $datefunc( 'A', $i ) );
+		$dateformatstring = ' '.$dateformatstring;
+		$dateformatstring = preg_replace( "/([^\\\])D/", "\\1" . backslashit( $dateweekday_abbrev ), $dateformatstring );
+		$dateformatstring = preg_replace( "/([^\\\])F/", "\\1" . backslashit( $datemonth ), $dateformatstring );
+		$dateformatstring = preg_replace( "/([^\\\])l/", "\\1" . backslashit( $dateweekday ), $dateformatstring );
+		$dateformatstring = preg_replace( "/([^\\\])M/", "\\1" . backslashit( $datemonth_abbrev ), $dateformatstring );
+		$dateformatstring = preg_replace( "/([^\\\])a/", "\\1" . backslashit( $datemeridiem ), $dateformatstring );
+		$dateformatstring = preg_replace( "/([^\\\])A/", "\\1" . backslashit( $datemeridiem_capital ), $dateformatstring );
+
+		$dateformatstring = substr( $dateformatstring, 1, strlen( $dateformatstring ) -1 );
+	}
+	$timezone_formats = array( 'P', 'I', 'O', 'T', 'Z', 'e' );
+	$timezone_formats_re = implode( '|', $timezone_formats );
+	if ( preg_match( "/$timezone_formats_re/", $dateformatstring ) ) {
+		$timezone_string = get_option( 'timezone_string' );
+		if ( $timezone_string ) {
+			$timezone_object = timezone_open( $timezone_string );
+			$date_object = date_create( null, $timezone_object );
+			foreach ( $timezone_formats as $timezone_format ) {
+				if ( false !== strpos( $dateformatstring, $timezone_format ) ) {
+					$formatted = date_format( $date_object, $timezone_format );
+					$dateformatstring = ' '.$dateformatstring;
+					$dateformatstring = preg_replace( "/([^\\\])$timezone_format/", "\\1" . backslashit( $formatted ), $dateformatstring );
+					$dateformatstring = substr( $dateformatstring, 1, strlen( $dateformatstring ) -1 );
+				}
+			}
+		}
+	}
+	$j = @$datefunc( $dateformatstring, $i );
+
+	/**
+	 * Filter the date formatted based on the locale.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param string $j          Formatted date string.
+	 * @param string $req_format Format to display the date.
+	 * @param int    $i          Unix timestamp.
+	 * @param bool   $gmt        Whether to convert to GMT for time. Default false.
+	 */
+	$j = apply_filters( 'date_i18n', $j, $req_format, $i, $gmt );
+	return $j;
+}
+
+/**
+ * Determines if the date should be declined.
+ *
+ * If the locale specifies that month names require a genitive case in certain
+ * formats (like 'j F Y'), the month name will be replaced with a correct form.
+ *
+ * @since 4.4.0
+ *
+ * @param string $date Formatted date string.
+ * @return string The date, declined if locale specifies it.
+ */
+function wp_maybe_decline_date( $date ) {
+	global $wp_locale;
+
+	// i18n functions are not available in SHORTINIT mode
+	if ( ! function_exists( '_x' ) ) {
+		return $date;
+	}
+
+	/* translators: If months in your language require a genitive case,
+	 * translate this to 'on'. Do not translate into your own language.
+	 */
+	if ( 'on' === _x( 'off', 'decline months names: on or off' ) ) {
+		// Match a format like 'j F Y' or 'j. F'
+		if ( @preg_match( '#^\d{1,2}\.? \w+#u', $date ) ) {
+			$months = $wp_locale->month;
+
+			foreach ( $months as $key => $month ) {
+				$months[ $key ] = '#' . $month . '#';
+			}
+
+			$date = preg_replace( $months, $wp_locale->month_genitive, $date );
+		}
+	}
+
+	// Used for locale-specific rules
+	$locale = get_locale();
+
+	if ( 'ca' === $locale ) {
+		// " de abril| de agost| de octubre..." -> " d'abril| d'agost| d'octubre..."
+		$date = preg_replace( '# de ([ao])#i', " d'\\1", $date );
+	}
+
+	return $date;
+}
+
+/**
+ * Convert float number to format based on the locale.
+ *
+ * @since 2.3.0
+ *
+ * @global WP_Locale $wp_locale
+ *
+ * @param float $number   The number to convert based on locale.
+ * @param int   $decimals Optional. Precision of the number of decimal places. Default 0.
+ * @return string Converted number in string format.
+ */
+function number_format_i18n( $number, $decimals = 0 ) {
+	global $wp_locale;
+
+	if ( isset( $wp_locale ) ) {
+		$formatted = number_format( $number, absint( $decimals ), $wp_locale->number_format['decimal_point'], $wp_locale->number_format['thousands_sep'] );
+	} else {
+		$formatted = number_format( $number, absint( $decimals ) );
+	}
+
+	/**
+	 * Filter the number formatted based on the locale.
+	 *
+	 * @since  2.8.0
+	 *
+	 * @param string $formatted Converted number in string format.
+	 */
+	return apply_filters( 'number_format_i18n', $formatted );
+}
+
+/**
+ * Convert number of bytes largest unit bytes will fit into.
+ *
+ * It is easier to read 1 kB than 1024 bytes and 1 MB than 1048576 bytes. Converts
+ * number of bytes to human readable number by taking the number of that unit
+ * that the bytes will go into it. Supports TB value.
+ *
+ * Please note that integers in PHP are limited to 32 bits, unless they are on
+ * 64 bit architecture, then they have 64 bit size. If you need to place the
+ * larger size then what PHP integer type will hold, then use a string. It will
+ * be converted to a double, which should always have 64 bit length.
+ *
+ * Technically the correct unit names for powers of 1024 are KiB, MiB etc.
+ *
+ * @since 2.3.0
+ *
+ * @param int|string $bytes    Number of bytes. Note max integer size for integers.
+ * @param int        $decimals Optional. Precision of number of decimal places. Default 0.
+ * @return string|false False on failure. Number string on success.
+ */
+function size_format( $bytes, $decimals = 0 ) {
+	$quant = array(
+		'TB' => TB_IN_BYTES,
+		'GB' => GB_IN_BYTES,
+		'MB' => MB_IN_BYTES,
+		'kB' => KB_IN_BYTES,
+		'B'  => 1,
+	);
+
+	foreach ( $quant as $unit => $mag ) {
+		if ( doubleval( $bytes ) >= $mag ) {
+			return number_format_i18n( $bytes / $mag, $decimals ) . ' ' . $unit;
+		}
+	}
+
+	return false;
+}
+
+/**
+ * Get the week start and end from the datetime or date string from MySQL.
+ *
+ * @since 0.71
+ *
+ * @param string     $mysqlstring   Date or datetime field type from MySQL.
+ * @param int|string $start_of_week Optional. Start of the week as an integer. Default empty string.
+ * @return array Keys are 'start' and 'end'.
+ */
+function get_weekstartend( $mysqlstring, $start_of_week = '' ) {
+	// MySQL string year.
+	$my = substr( $mysqlstring, 0, 4 );
+
+	// MySQL string month.
+	$mm = substr( $mysqlstring, 8, 2 );
+
+	// MySQL string day.
+	$md = substr( $mysqlstring, 5, 2 );
+
+	// The timestamp for MySQL string day.
+	$day = mktime( 0, 0, 0, $md, $mm, $my );
+
+	// The day of the week from the timestamp.
+	$weekday = date( 'w', $day );
+
+	if ( !is_numeric($start_of_week) )
+		$start_of_week = get_option( 'start_of_week' );
+
+	if ( $weekday < $start_of_week )
+		$weekday += 7;
+
+	// The most recent week start day on or before $day.
+	$start = $day - DAY_IN_SECONDS * ( $weekday - $start_of_week );
+
+	// $start + 1 week - 1 second.
+	$end = $start + WEEK_IN_SECONDS - 1;
+	return compact( 'start', 'end' );
+}
+
+/**
+ * Unserialize value only if it was serialized.
+ *
+ * @since 2.0.0
+ *
+ * @param string $original Maybe unserialized original, if is needed.
+ * @return mixed Unserialized data can be any type.
+ */
+function maybe_unserialize( $original ) {
+	if ( is_serialized( $original ) ) // don't attempt to unserialize data that wasn't serialized going in
+		return @unserialize( $original );
+	return $original;
+}
+
+/**
+ * Check value to find if it was serialized.
+ *
+ * If $data is not an string, then returned value will always be false.
+ * Serialized data is always a string.
+ *
+ * @since 2.0.5
+ *
+ * @param string $data   Value to check to see if was serialized.
+ * @param bool   $strict Optional. Whether to be strict about the end of the string. Default true.
+ * @return bool False if not serialized and true if it was.
+ */
+function is_serialized( $data, $strict = true ) {
+	// if it isn't a string, it isn't serialized.
+	if ( ! is_string( $data ) ) {
+		return false;
+	}
+	$data = trim( $data );
+ 	if ( 'N;' == $data ) {
+		return true;
+	}
+	if ( strlen( $data ) < 4 ) {
+		return false;
+	}
+	if ( ':' !== $data[1] ) {
+		return false;
+	}
+	if ( $strict ) {
+		$lastc = substr( $data, -1 );
+		if ( ';' !== $lastc && '}' !== $lastc ) {
+			return false;
+		}
+	} else {
+		$semicolon = strpos( $data, ';' );
+		$brace     = strpos( $data, '}' );
+		// Either ; or } must exist.
+		if ( false === $semicolon && false === $brace )
+			return false;
+		// But neither must be in the first X characters.
+		if ( false !== $semicolon && $semicolon < 3 )
+			return false;
+		if ( false !== $brace && $brace < 4 )
+			return false;
+	}
+	$token = $data[0];
+	switch ( $token ) {
+		case 's' :
+			if ( $strict ) {
+				if ( '"' !== substr( $data, -2, 1 ) ) {
+					return false;
+				}
+			} elseif ( false === strpos( $data, '"' ) ) {
+				return false;
+			}
+			// or else fall through
+		case 'a' :
+		case 'O' :
+			return (bool) preg_match( "/^{$token}:[0-9]+:/s", $data );
+		case 'b' :
+		case 'i' :
+		case 'd' :
+			$end = $strict ? '$' : '';
+			return (bool) preg_match( "/^{$token}:[0-9.E-]+;$end/", $data );
+	}
+	return false;
+}
+
+/**
+ * Check whether serialized data is of string type.
+ *
+ * @since 2.0.5
+ *
+ * @param string $data Serialized data.
+ * @return bool False if not a serialized string, true if it is.
+ */
+function is_serialized_string( $data ) {
+	// if it isn't a string, it isn't a serialized string.
+	if ( ! is_string( $data ) ) {
+		return false;
+	}
+	$data = trim( $data );
+	if ( strlen( $data ) < 4 ) {
+		return false;
+	} elseif ( ':' !== $data[1] ) {
+		return false;
+	} elseif ( ';' !== substr( $data, -1 ) ) {
+		return false;
+	} elseif ( $data[0] !== 's' ) {
+		return false;
+	} elseif ( '"' !== substr( $data, -2, 1 ) ) {
+		return false;
+	} else {
+		return true;
+	}
+}
+
+/**
+ * Serialize data, if needed.
+ *
+ * @since 2.0.5
+ *
+ * @param string|array|object $data Data that might be serialized.
+ * @return mixed A scalar data
+ */
+function maybe_serialize( $data ) {
+	if ( is_array( $data ) || is_object( $data ) )
+		return serialize( $data );
+
+	// Double serialization is required for backward compatibility.
+	// See https://core.trac.wordpress.org/ticket/12930
+	// Also the world will end. See WP 3.6.1.
+	if ( is_serialized( $data, false ) )
+		return serialize( $data );
+
+	return $data;
+}
+
+/**
+ * Retrieve post title from XMLRPC XML.
+ *
+ * If the title element is not part of the XML, then the default post title from
+ * the $post_default_title will be used instead.
+ *
+ * @since 0.71
+ *
+ * @global string $post_default_title Default XML-RPC post title.
+ *
+ * @param string $content XMLRPC XML Request content
+ * @return string Post title
+ */
+function xmlrpc_getposttitle( $content ) {
+	global $post_default_title;
+	if ( preg_match( '/<title>(.+?)<\/title>/is', $content, $matchtitle ) ) {
+		$post_title = $matchtitle[1];
+	} else {
+		$post_title = $post_default_title;
+	}
+	return $post_title;
+}
+
+/**
+ * Retrieve the post category or categories from XMLRPC XML.
+ *
+ * If the category element is not found, then the default post category will be
+ * used. The return type then would be what $post_default_category. If the
+ * category is found, then it will always be an array.
+ *
+ * @since 0.71
+ *
+ * @global string $post_default_category Default XML-RPC post category.
+ *
+ * @param string $content XMLRPC XML Request content
+ * @return string|array List of categories or category name.
+ */
+function xmlrpc_getpostcategory( $content ) {
+	global $post_default_category;
+	if ( preg_match( '/<category>(.+?)<\/category>/is', $content, $matchcat ) ) {
+		$post_category = trim( $matchcat[1], ',' );
+		$post_category = explode( ',', $post_category );
+	} else {
+		$post_category = $post_default_category;
+	}
+	return $post_category;
+}
+
+/**
+ * XMLRPC XML content without title and category elements.
+ *
+ * @since 0.71
+ *
+ * @param string $content XML-RPC XML Request content.
+ * @return string XMLRPC XML Request content without title and category elements.
+ */
+function xmlrpc_removepostdata( $content ) {
+	$content = preg_replace( '/<title>(.+?)<\/title>/si', '', $content );
+	$content = preg_replace( '/<category>(.+?)<\/category>/si', '', $content );
+	$content = trim( $content );
+	return $content;
+}
+
+/**
+ * Use RegEx to extract URLs from arbitrary content.
+ *
+ * @since 3.7.0
+ *
+ * @param string $content Content to extract URLs from.
+ * @return array URLs found in passed string.
+ */
+function wp_extract_urls( $content ) {
+	preg_match_all(
+		"#([\"']?)("
+			. "(?:([\w-]+:)?//?)"
+			. "[^\s()<>]+"
+			. "[.]"
+			. "(?:"
+				. "\([\w\d]+\)|"
+				. "(?:"
+					. "[^`!()\[\]{};:'\".,<>«»“”‘’\s]|"
+					. "(?:[:]\d+)?/?"
+				. ")+"
+			. ")"
+		. ")\\1#",
+		$content,
+		$post_links
+	);
+
+	$post_links = array_unique( array_map( 'html_entity_decode', $post_links[2] ) );
+
+	return array_values( $post_links );
+}
+
+/**
+ * Check content for video and audio links to add as enclosures.
+ *
+ * Will not add enclosures that have already been added and will
+ * remove enclosures that are no longer in the post. This is called as
+ * pingbacks and trackbacks.
+ *
+ * @since 1.5.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $content Post Content.
+ * @param int    $post_ID Post ID.
+ */
+function do_enclose( $content, $post_ID ) {
+	global $wpdb;
+
+	//TODO: Tidy this ghetto code up and make the debug code optional
+	include_once( ABSPATH . WPINC . '/class-IXR.php' );
+
+	$post_links = array();
+
+	$pung = get_enclosed( $post_ID );
+
+	$post_links_temp = wp_extract_urls( $content );
+
+	foreach ( $pung as $link_test ) {
+		if ( ! in_array( $link_test, $post_links_temp ) ) { // link no longer in post
+			$mids = $wpdb->get_col( $wpdb->prepare("SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = 'enclosure' AND meta_value LIKE %s", $post_ID, $wpdb->esc_like( $link_test ) . '%') );
+			foreach ( $mids as $mid )
+				delete_metadata_by_mid( 'post', $mid );
+		}
+	}
+
+	foreach ( (array) $post_links_temp as $link_test ) {
+		if ( !in_array( $link_test, $pung ) ) { // If we haven't pung it already
+			$test = @parse_url( $link_test );
+			if ( false === $test )
+				continue;
+			if ( isset( $test['query'] ) )
+				$post_links[] = $link_test;
+			elseif ( isset($test['path']) && ( $test['path'] != '/' ) &&  ($test['path'] != '' ) )
+				$post_links[] = $link_test;
+		}
+	}
+
+	/**
+	 * Filter the list of enclosure links before querying the database.
+	 *
+	 * Allows for the addition and/or removal of potential enclosures to save
+	 * to postmeta before checking the database for existing enclosures.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param array $post_links An array of enclosure links.
+	 * @param int   $post_ID    Post ID.
+	 */
+	$post_links = apply_filters( 'enclosure_links', $post_links, $post_ID );
+
+	foreach ( (array) $post_links as $url ) {
+		if ( $url != '' && !$wpdb->get_var( $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = 'enclosure' AND meta_value LIKE %s", $post_ID, $wpdb->esc_like( $url ) . '%' ) ) ) {
+
+			if ( $headers = wp_get_http_headers( $url) ) {
+				$len = isset( $headers['content-length'] ) ? (int) $headers['content-length'] : 0;
+				$type = isset( $headers['content-type'] ) ? $headers['content-type'] : '';
+				$allowed_types = array( 'video', 'audio' );
+
+				// Check to see if we can figure out the mime type from
+				// the extension
+				$url_parts = @parse_url( $url );
+				if ( false !== $url_parts ) {
+					$extension = pathinfo( $url_parts['path'], PATHINFO_EXTENSION );
+					if ( !empty( $extension ) ) {
+						foreach ( wp_get_mime_types() as $exts => $mime ) {
+							if ( preg_match( '!^(' . $exts . ')$!i', $extension ) ) {
+								$type = $mime;
+								break;
+							}
+						}
+					}
+				}
+
+				if ( in_array( substr( $type, 0, strpos( $type, "/" ) ), $allowed_types ) ) {
+					add_post_meta( $post_ID, 'enclosure', "$url\n$len\n$mime\n" );
+				}
+			}
+		}
+	}
+}
+
+/**
+ * Retrieve HTTP Headers from URL.
+ *
+ * @since 1.5.1
+ *
+ * @param string $url        URL to retrieve HTTP headers from.
+ * @param bool   $deprecated Not Used.
+ * @return bool|string False on failure, headers on success.
+ */
+function wp_get_http_headers( $url, $deprecated = false ) {
+	if ( !empty( $deprecated ) )
+		_deprecated_argument( __FUNCTION__, '2.7' );
+
+	$response = wp_safe_remote_head( $url );
+
+	if ( is_wp_error( $response ) )
+		return false;
+
+	return wp_remote_retrieve_headers( $response );
+}
+
+/**
+ * Whether the publish date of the current post in the loop is different from the
+ * publish date of the previous post in the loop.
+ *
+ * @since 0.71
+ *
+ * @global string $currentday  The day of the current post in the loop.
+ * @global string $previousday The day of the previous post in the loop.
+ *
+ * @return int 1 when new day, 0 if not a new day.
+ */
+function is_new_day() {
+	global $currentday, $previousday;
+	if ( $currentday != $previousday )
+		return 1;
+	else
+		return 0;
+}
+
+/**
+ * Build URL query based on an associative and, or indexed array.
+ *
+ * This is a convenient function for easily building url queries. It sets the
+ * separator to '&' and uses _http_build_query() function.
+ *
+ * @since 2.3.0
+ *
+ * @see _http_build_query() Used to build the query
+ * @link http://us2.php.net/manual/en/function.http-build-query.php for more on what
+ *		 http_build_query() does.
+ *
+ * @param array $data URL-encode key/value pairs.
+ * @return string URL-encoded string.
+ */
+function build_query( $data ) {
+	return _http_build_query( $data, null, '&', '', false );
+}
+
+/**
+ * From php.net (modified by Mark Jaquith to behave like the native PHP5 function).
+ *
+ * @since 3.2.0
+ * @access private
+ *
+ * @see http://us1.php.net/manual/en/function.http-build-query.php
+ *
+ * @param array|object  $data       An array or object of data. Converted to array.
+ * @param string        $prefix     Optional. Numeric index. If set, start parameter numbering with it.
+ *                                  Default null.
+ * @param string        $sep        Optional. Argument separator; defaults to 'arg_separator.output'.
+ *                                  Default null.
+ * @param string        $key        Optional. Used to prefix key name. Default empty.
+ * @param bool          $urlencode  Optional. Whether to use urlencode() in the result. Default true.
+ *
+ * @return string The query string.
+ */
+function _http_build_query( $data, $prefix = null, $sep = null, $key = '', $urlencode = true ) {
+	$ret = array();
+
+	foreach ( (array) $data as $k => $v ) {
+		if ( $urlencode)
+			$k = urlencode($k);
+		if ( is_int($k) && $prefix != null )
+			$k = $prefix.$k;
+		if ( !empty($key) )
+			$k = $key . '%5B' . $k . '%5D';
+		if ( $v === null )
+			continue;
+		elseif ( $v === false )
+			$v = '0';
+
+		if ( is_array($v) || is_object($v) )
+			array_push($ret,_http_build_query($v, '', $sep, $k, $urlencode));
+		elseif ( $urlencode )
+			array_push($ret, $k.'='.urlencode($v));
+		else
+			array_push($ret, $k.'='.$v);
+	}
+
+	if ( null === $sep )
+		$sep = ini_get('arg_separator.output');
+
+	return implode($sep, $ret);
+}
+
+/**
+ * Retrieves a modified URL query string.
+ *
+ * You can rebuild the URL and append query variables to the URL query by using this function.
+ * There are two ways to use this function; either a single key and value, or an associative array.
+ *
+ * Using a single key and value:
+ *
+ *     add_query_arg( 'key', 'value', 'http://example.com' );
+ *
+ * Using an associative array:
+ *
+ *     add_query_arg( array(
+ *         'key1' => 'value1',
+ *         'key2' => 'value2',
+ *     ), 'http://example.com' );
+ *
+ * Omitting the URL from either use results in the current URL being used
+ * (the value of `$_SERVER['REQUEST_URI']`).
+ *
+ * Values are expected to be encoded appropriately with urlencode() or rawurlencode().
+ *
+ * Setting any query variable's value to boolean false removes the key (see remove_query_arg()).
+ *
+ * Important: The return value of add_query_arg() is not escaped by default. Output should be
+ * late-escaped with esc_url() or similar to help prevent vulnerability to cross-site scripting
+ * (XSS) attacks.
+ *
+ * @since 1.5.0
+ *
+ * @param string|array $key   Either a query variable key, or an associative array of query variables.
+ * @param string       $value Optional. Either a query variable value, or a URL to act upon.
+ * @param string       $url   Optional. A URL to act upon.
+ * @return string New URL query string (unescaped).
+ */
+function add_query_arg() {
+	$args = func_get_args();
+	if ( is_array( $args[0] ) ) {
+		if ( count( $args ) < 2 || false === $args[1] )
+			$uri = $_SERVER['REQUEST_URI'];
+		else
+			$uri = $args[1];
+	} else {
+		if ( count( $args ) < 3 || false === $args[2] )
+			$uri = $_SERVER['REQUEST_URI'];
+		else
+			$uri = $args[2];
+	}
+
+	if ( $frag = strstr( $uri, '#' ) )
+		$uri = substr( $uri, 0, -strlen( $frag ) );
+	else
+		$frag = '';
+
+	if ( 0 === stripos( $uri, 'http://' ) ) {
+		$protocol = 'http://';
+		$uri = substr( $uri, 7 );
+	} elseif ( 0 === stripos( $uri, 'https://' ) ) {
+		$protocol = 'https://';
+		$uri = substr( $uri, 8 );
+	} else {
+		$protocol = '';
+	}
+
+	if ( strpos( $uri, '?' ) !== false ) {
+		list( $base, $query ) = explode( '?', $uri, 2 );
+		$base .= '?';
+	} elseif ( $protocol || strpos( $uri, '=' ) === false ) {
+		$base = $uri . '?';
+		$query = '';
+	} else {
+		$base = '';
+		$query = $uri;
+	}
+
+	wp_parse_str( $query, $qs );
+	$qs = urlencode_deep( $qs ); // this re-URL-encodes things that were already in the query string
+	if ( is_array( $args[0] ) ) {
+		foreach ( $args[0] as $k => $v ) {
+			$qs[ $k ] = $v;
+		}
+	} else {
+		$qs[ $args[0] ] = $args[1];
+	}
+
+	foreach ( $qs as $k => $v ) {
+		if ( $v === false )
+			unset( $qs[$k] );
+	}
+
+	$ret = build_query( $qs );
+	$ret = trim( $ret, '?' );
+	$ret = preg_replace( '#=(&|$)#', '$1', $ret );
+	$ret = $protocol . $base . $ret . $frag;
+	$ret = rtrim( $ret, '?' );
+	return $ret;
+}
+
+/**
+ * Removes an item or items from a query string.
+ *
+ * @since 1.5.0
+ *
+ * @param string|array $key   Query key or keys to remove.
+ * @param bool|string  $query Optional. When false uses the current URL. Default false.
+ * @return string New URL query string.
+ */
+function remove_query_arg( $key, $query = false ) {
+	if ( is_array( $key ) ) { // removing multiple keys
+		foreach ( $key as $k )
+			$query = add_query_arg( $k, false, $query );
+		return $query;
+	}
+	return add_query_arg( $key, false, $query );
+}
+
+/**
+ * Returns an array of single-use query variable names that can be removed from a URL.
+ *
+ * @since 4.4.0
+ *
+ * @return array An array of parameters to remove from the URL.
+ */
+function wp_removable_query_args() {
+	$removable_query_args = array(
+		'activate',
+		'activated',
+		'approved',
+		'deactivate',
+		'deleted',
+		'disabled',
+		'enabled',
+		'error',
+		'locked',
+		'message',
+		'same',
+		'saved',
+		'settings-updated',
+		'skipped',
+		'spammed',
+		'trashed',
+		'unspammed',
+		'untrashed',
+		'update',
+		'updated',
+		'wp-post-new-reload',
+	);
+
+	/**
+	 * Filter the list of query variables to remove.
+	 *
+	 * @since 4.2.0
+	 *
+	 * @param array $removable_query_args An array of query variables to remove from a URL.
+	 */
+	return apply_filters( 'removable_query_args', $removable_query_args );
+}
+
+/**
+ * Walks the array while sanitizing the contents.
+ *
+ * @since 0.71
+ *
+ * @param array $array Array to walk while sanitizing contents.
+ * @return array Sanitized $array.
+ */
+function add_magic_quotes( $array ) {
+	foreach ( (array) $array as $k => $v ) {
+		if ( is_array( $v ) ) {
+			$array[$k] = add_magic_quotes( $v );
+		} else {
+			$array[$k] = addslashes( $v );
+		}
+	}
+	return $array;
+}
+
+/**
+ * HTTP request for URI to retrieve content.
+ *
+ * @since 1.5.1
+ *
+ * @see wp_safe_remote_get()
+ *
+ * @param string $uri URI/URL of web page to retrieve.
+ * @return false|string HTTP content. False on failure.
+ */
+function wp_remote_fopen( $uri ) {
+	$parsed_url = @parse_url( $uri );
+
+	if ( !$parsed_url || !is_array( $parsed_url ) )
+		return false;
+
+	$options = array();
+	$options['timeout'] = 10;
+
+	$response = wp_safe_remote_get( $uri, $options );
+
+	if ( is_wp_error( $response ) )
+		return false;
+
+	return wp_remote_retrieve_body( $response );
+}
+
+/**
+ * Set up the WordPress query.
+ *
+ * @since 2.0.0
+ *
+ * @global WP       $wp_locale
+ * @global WP_Query $wp_query
+ * @global WP_Query $wp_the_query
+ *
+ * @param string|array $query_vars Default WP_Query arguments.
+ */
+function wp( $query_vars = '' ) {
+	global $wp, $wp_query, $wp_the_query;
+	$wp->main( $query_vars );
+
+	if ( !isset($wp_the_query) )
+		$wp_the_query = $wp_query;
+}
+
+/**
+ * Retrieve the description for the HTTP status.
+ *
+ * @since 2.3.0
+ *
+ * @global array $wp_header_to_desc
+ *
+ * @param int $code HTTP status code.
+ * @return string Empty string if not found, or description if found.
+ */
+function get_status_header_desc( $code ) {
+	global $wp_header_to_desc;
+
+	$code = absint( $code );
+
+	if ( !isset( $wp_header_to_desc ) ) {
+		$wp_header_to_desc = array(
+			100 => 'Continue',
+			101 => 'Switching Protocols',
+			102 => 'Processing',
+
+			200 => 'OK',
+			201 => 'Created',
+			202 => 'Accepted',
+			203 => 'Non-Authoritative Information',
+			204 => 'No Content',
+			205 => 'Reset Content',
+			206 => 'Partial Content',
+			207 => 'Multi-Status',
+			226 => 'IM Used',
+
+			300 => 'Multiple Choices',
+			301 => 'Moved Permanently',
+			302 => 'Found',
+			303 => 'See Other',
+			304 => 'Not Modified',
+			305 => 'Use Proxy',
+			306 => 'Reserved',
+			307 => 'Temporary Redirect',
+			308 => 'Permanent Redirect',
+
+			400 => 'Bad Request',
+			401 => 'Unauthorized',
+			402 => 'Payment Required',
+			403 => 'Forbidden',
+			404 => 'Not Found',
+			405 => 'Method Not Allowed',
+			406 => 'Not Acceptable',
+			407 => 'Proxy Authentication Required',
+			408 => 'Request Timeout',
+			409 => 'Conflict',
+			410 => 'Gone',
+			411 => 'Length Required',
+			412 => 'Precondition Failed',
+			413 => 'Request Entity Too Large',
+			414 => 'Request-URI Too Long',
+			415 => 'Unsupported Media Type',
+			416 => 'Requested Range Not Satisfiable',
+			417 => 'Expectation Failed',
+			418 => 'I\'m a teapot',
+			421 => 'Misdirected Request',
+			422 => 'Unprocessable Entity',
+			423 => 'Locked',
+			424 => 'Failed Dependency',
+			426 => 'Upgrade Required',
+			428 => 'Precondition Required',
+			429 => 'Too Many Requests',
+			431 => 'Request Header Fields Too Large',
+			451 => 'Unavailable For Legal Reasons',
+
+			500 => 'Internal Server Error',
+			501 => 'Not Implemented',
+			502 => 'Bad Gateway',
+			503 => 'Service Unavailable',
+			504 => 'Gateway Timeout',
+			505 => 'HTTP Version Not Supported',
+			506 => 'Variant Also Negotiates',
+			507 => 'Insufficient Storage',
+			510 => 'Not Extended',
+			511 => 'Network Authentication Required',
+		);
+	}
+
+	if ( isset( $wp_header_to_desc[$code] ) )
+		return $wp_header_to_desc[$code];
+	else
+		return '';
+}
+
+/**
+ * Set HTTP status header.
+ *
+ * @since 2.0.0
+ * @since 4.4.0 Added the `$description` parameter.
+ *
+ * @see get_status_header_desc()
+ *
+ * @param int    $code        HTTP status code.
+ * @param string $description Optional. A custom description for the HTTP status.
+ */
+function status_header( $code, $description = '' ) {
+	if ( ! $description ) {
+		$description = get_status_header_desc( $code );
+	}
+
+	if ( empty( $description ) ) {
+		return;
+	}
+
+	$protocol = wp_get_server_protocol();
+	$status_header = "$protocol $code $description";
+	if ( function_exists( 'apply_filters' ) )
+
+		/**
+		 * Filter an HTTP status header.
+		 *
+		 * @since 2.2.0
+		 *
+		 * @param string $status_header HTTP status header.
+		 * @param int    $code          HTTP status code.
+		 * @param string $description   Description for the status code.
+		 * @param string $protocol      Server protocol.
+		 */
+		$status_header = apply_filters( 'status_header', $status_header, $code, $description, $protocol );
+
+	@header( $status_header, true, $code );
+}
+
+/**
+ * Get the header information to prevent caching.
+ *
+ * The several different headers cover the different ways cache prevention
+ * is handled by different browsers
+ *
+ * @since 2.8.0
+ *
+ * @return array The associative array of header names and field values.
+ */
+function wp_get_nocache_headers() {
+	$headers = array(
+		'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',
+		'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
+		'Pragma' => 'no-cache',
+	);
+
+	if ( function_exists('apply_filters') ) {
+		/**
+		 * Filter the cache-controlling headers.
+		 *
+		 * @since 2.8.0
+		 *
+		 * @see wp_get_nocache_headers()
+		 *
+		 * @param array $headers {
+		 *     Header names and field values.
+		 *
+		 *     @type string $Expires       Expires header.
+		 *     @type string $Cache-Control Cache-Control header.
+		 *     @type string $Pragma        Pragma header.
+		 * }
+		 */
+		$headers = (array) apply_filters( 'nocache_headers', $headers );
+	}
+	$headers['Last-Modified'] = false;
+	return $headers;
+}
+
+/**
+ * Set the headers to prevent caching for the different browsers.
+ *
+ * Different browsers support different nocache headers, so several
+ * headers must be sent so that all of them get the point that no
+ * caching should occur.
+ *
+ * @since 2.0.0
+ *
+ * @see wp_get_nocache_headers()
+ */
+function nocache_headers() {
+	$headers = wp_get_nocache_headers();
+
+	unset( $headers['Last-Modified'] );
+
+	// In PHP 5.3+, make sure we are not sending a Last-Modified header.
+	if ( function_exists( 'header_remove' ) ) {
+		@header_remove( 'Last-Modified' );
+	} else {
+		// In PHP 5.2, send an empty Last-Modified header, but only as a
+		// last resort to override a header already sent. #WP23021
+		foreach ( headers_list() as $header ) {
+			if ( 0 === stripos( $header, 'Last-Modified' ) ) {
+				$headers['Last-Modified'] = '';
+				break;
+			}
+		}
+	}
+
+	foreach ( $headers as $name => $field_value )
+		@header("{$name}: {$field_value}");
+}
+
+/**
+ * Set the headers for caching for 10 days with JavaScript content type.
+ *
+ * @since 2.1.0
+ */
+function cache_javascript_headers() {
+	$expiresOffset = 10 * DAY_IN_SECONDS;
+
+	header( "Content-Type: text/javascript; charset=" . get_bloginfo( 'charset' ) );
+	header( "Vary: Accept-Encoding" ); // Handle proxies
+	header( "Expires: " . gmdate( "D, d M Y H:i:s", time() + $expiresOffset ) . " GMT" );
+}
+
+/**
+ * Retrieve the number of database queries during the WordPress execution.
+ *
+ * @since 2.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @return int Number of database queries.
+ */
+function get_num_queries() {
+	global $wpdb;
+	return $wpdb->num_queries;
+}
+
+/**
+ * Whether input is yes or no.
+ *
+ * Must be 'y' to be true.
+ *
+ * @since 1.0.0
+ *
+ * @param string $yn Character string containing either 'y' (yes) or 'n' (no).
+ * @return bool True if yes, false on anything else.
+ */
+function bool_from_yn( $yn ) {
+	return ( strtolower( $yn ) == 'y' );
+}
+
+/**
+ * Load the feed template from the use of an action hook.
+ *
+ * If the feed action does not have a hook, then the function will die with a
+ * message telling the visitor that the feed is not valid.
+ *
+ * It is better to only have one hook for each feed.
+ *
+ * @since 2.1.0
+ *
+ * @global WP_Query $wp_query Used to tell if the use a comment feed.
+ */
+function do_feed() {
+	global $wp_query;
+
+	$feed = get_query_var( 'feed' );
+
+	// Remove the pad, if present.
+	$feed = preg_replace( '/^_+/', '', $feed );
+
+	if ( $feed == '' || $feed == 'feed' )
+		$feed = get_default_feed();
+
+	if ( ! has_action( "do_feed_{$feed}" ) ) {
+		wp_die( __( 'ERROR: This is not a valid feed template.' ), '', array( 'response' => 404 ) );
+	}
+
+	/**
+	 * Fires once the given feed is loaded.
+	 *
+	 * The dynamic portion of the hook name, `$feed`, refers to the feed template name.
+	 * Possible values include: 'rdf', 'rss', 'rss2', and 'atom'.
+	 *
+	 * @since 2.1.0
+	 * @since 4.4.0 The `$feed` parameter was added.
+	 *
+	 * @param bool   $is_comment_feed Whether the feed is a comment feed.
+	 * @param string $feed            The feed name.
+	 */
+	do_action( "do_feed_{$feed}", $wp_query->is_comment_feed, $feed );
+}
+
+/**
+ * Load the RDF RSS 0.91 Feed template.
+ *
+ * @since 2.1.0
+ *
+ * @see load_template()
+ */
+function do_feed_rdf() {
+	load_template( ABSPATH . WPINC . '/feed-rdf.php' );
+}
+
+/**
+ * Load the RSS 1.0 Feed Template.
+ *
+ * @since 2.1.0
+ *
+ * @see load_template()
+ */
+function do_feed_rss() {
+	load_template( ABSPATH . WPINC . '/feed-rss.php' );
+}
+
+/**
+ * Load either the RSS2 comment feed or the RSS2 posts feed.
+ *
+ * @since 2.1.0
+ *
+ * @see load_template()
+ *
+ * @param bool $for_comments True for the comment feed, false for normal feed.
+ */
+function do_feed_rss2( $for_comments ) {
+	if ( $for_comments )
+		load_template( ABSPATH . WPINC . '/feed-rss2-comments.php' );
+	else
+		load_template( ABSPATH . WPINC . '/feed-rss2.php' );
+}
+
+/**
+ * Load either Atom comment feed or Atom posts feed.
+ *
+ * @since 2.1.0
+ *
+ * @see load_template()
+ *
+ * @param bool $for_comments True for the comment feed, false for normal feed.
+ */
+function do_feed_atom( $for_comments ) {
+	if ($for_comments)
+		load_template( ABSPATH . WPINC . '/feed-atom-comments.php');
+	else
+		load_template( ABSPATH . WPINC . '/feed-atom.php' );
+}
+
+/**
+ * Display the robots.txt file content.
+ *
+ * The echo content should be with usage of the permalinks or for creating the
+ * robots.txt file.
+ *
+ * @since 2.1.0
+ */
+function do_robots() {
+	header( 'Content-Type: text/plain; charset=utf-8' );
+
+	/**
+	 * Fires when displaying the robots.txt file.
+	 *
+	 * @since 2.1.0
+	 */
+	do_action( 'do_robotstxt' );
+
+	$output = "User-agent: *\n";
+	$public = get_option( 'blog_public' );
+	if ( '0' == $public ) {
+		$output .= "Disallow: /\n";
+	} else {
+		$site_url = parse_url( site_url() );
+		$path = ( !empty( $site_url['path'] ) ) ? $site_url['path'] : '';
+		$output .= "Disallow: $path/wp-admin/\n";
+		$output .= "Allow: $path/wp-admin/admin-ajax.php\n";
+	}
+
+	/**
+	 * Filter the robots.txt output.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param string $output Robots.txt output.
+	 * @param bool   $public Whether the site is considered "public".
+	 */
+	echo apply_filters( 'robots_txt', $output, $public );
+}
+
+/**
+ * Test whether WordPress is already installed.
+ *
+ * The cache will be checked first. If you have a cache plugin, which saves
+ * the cache values, then this will work. If you use the default WordPress
+ * cache, and the database goes away, then you might have problems.
+ *
+ * Checks for the 'siteurl' option for whether WordPress is installed.
+ *
+ * @since 2.1.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @return bool Whether the site is already installed.
+ */
+function is_blog_installed() {
+	global $wpdb;
+
+	/*
+	 * Check cache first. If options table goes away and we have true
+	 * cached, oh well.
+	 */
+	if ( wp_cache_get( 'is_blog_installed' ) )
+		return true;
+
+	$suppress = $wpdb->suppress_errors();
+	if ( ! wp_installing() ) {
+		$alloptions = wp_load_alloptions();
+	}
+	// If siteurl is not set to autoload, check it specifically
+	if ( !isset( $alloptions['siteurl'] ) )
+		$installed = $wpdb->get_var( "SELECT option_value FROM $wpdb->options WHERE option_name = 'siteurl'" );
+	else
+		$installed = $alloptions['siteurl'];
+	$wpdb->suppress_errors( $suppress );
+
+	$installed = !empty( $installed );
+	wp_cache_set( 'is_blog_installed', $installed );
+
+	if ( $installed )
+		return true;
+
+	// If visiting repair.php, return true and let it take over.
+	if ( defined( 'WP_REPAIRING' ) )
+		return true;
+
+	$suppress = $wpdb->suppress_errors();
+
+	/*
+	 * Loop over the WP tables. If none exist, then scratch install is allowed.
+	 * If one or more exist, suggest table repair since we got here because the
+	 * options table could not be accessed.
+	 */
+	$wp_tables = $wpdb->tables();
+	foreach ( $wp_tables as $table ) {
+		// The existence of custom user tables shouldn't suggest an insane state or prevent a clean install.
+		if ( defined( 'CUSTOM_USER_TABLE' ) && CUSTOM_USER_TABLE == $table )
+			continue;
+		if ( defined( 'CUSTOM_USER_META_TABLE' ) && CUSTOM_USER_META_TABLE == $table )
+			continue;
+
+		if ( ! $wpdb->get_results( "DESCRIBE $table;" ) )
+			continue;
+
+		// One or more tables exist. We are insane.
+
+		wp_load_translations_early();
+
+		// Die with a DB error.
+		$wpdb->error = sprintf( __( 'One or more database tables are unavailable. The database may need to be <a href="%s">repaired</a>.' ), 'maint/repair.php?referrer=is_blog_installed' );
+		dead_db();
+	}
+
+	$wpdb->suppress_errors( $suppress );
+
+	wp_cache_set( 'is_blog_installed', false );
+
+	return false;
+}
+
+/**
+ * Retrieve URL with nonce added to URL query.
+ *
+ * @since 2.0.4
+ *
+ * @param string     $actionurl URL to add nonce action.
+ * @param int|string $action    Optional. Nonce action name. Default -1.
+ * @param string     $name      Optional. Nonce name. Default '_wpnonce'.
+ * @return string Escaped URL with nonce action added.
+ */
+function wp_nonce_url( $actionurl, $action = -1, $name = '_wpnonce' ) {
+	$actionurl = str_replace( '&amp;', '&', $actionurl );
+	return esc_html( add_query_arg( $name, wp_create_nonce( $action ), $actionurl ) );
+}
+
+/**
+ * Retrieve or display nonce hidden field for forms.
+ *
+ * The nonce field is used to validate that the contents of the form came from
+ * the location on the current site and not somewhere else. The nonce does not
+ * offer absolute protection, but should protect against most cases. It is very
+ * important to use nonce field in forms.
+ *
+ * The $action and $name are optional, but if you want to have better security,
+ * it is strongly suggested to set those two parameters. It is easier to just
+ * call the function without any parameters, because validation of the nonce
+ * doesn't require any parameters, but since crackers know what the default is
+ * it won't be difficult for them to find a way around your nonce and cause
+ * damage.
+ *
+ * The input name will be whatever $name value you gave. The input value will be
+ * the nonce creation value.
+ *
+ * @since 2.0.4
+ *
+ * @param int|string $action  Optional. Action name. Default -1.
+ * @param string     $name    Optional. Nonce name. Default '_wpnonce'.
+ * @param bool       $referer Optional. Whether to set the referer field for validation. Default true.
+ * @param bool       $echo    Optional. Whether to display or return hidden form field. Default true.
+ * @return string Nonce field HTML markup.
+ */
+function wp_nonce_field( $action = -1, $name = "_wpnonce", $referer = true , $echo = true ) {
+	$name = esc_attr( $name );
+	$nonce_field = '<input type="hidden" id="' . $name . '" name="' . $name . '" value="' . wp_create_nonce( $action ) . '" />';
+
+	if ( $referer )
+		$nonce_field .= wp_referer_field( false );
+
+	if ( $echo )
+		echo $nonce_field;
+
+	return $nonce_field;
+}
+
+/**
+ * Retrieve or display referer hidden field for forms.
+ *
+ * The referer link is the current Request URI from the server super global. The
+ * input name is '_wp_http_referer', in case you wanted to check manually.
+ *
+ * @since 2.0.4
+ *
+ * @param bool $echo Optional. Whether to echo or return the referer field. Default true.
+ * @return string Referer field HTML markup.
+ */
+function wp_referer_field( $echo = true ) {
+	$referer_field = '<input type="hidden" name="_wp_http_referer" value="'. esc_attr( wp_unslash( $_SERVER['REQUEST_URI'] ) ) . '" />';
+
+	if ( $echo )
+		echo $referer_field;
+	return $referer_field;
+}
+
+/**
+ * Retrieve or display original referer hidden field for forms.
+ *
+ * The input name is '_wp_original_http_referer' and will be either the same
+ * value of wp_referer_field(), if that was posted already or it will be the
+ * current page, if it doesn't exist.
+ *
+ * @since 2.0.4
+ *
+ * @param bool   $echo         Optional. Whether to echo the original http referer. Default true.
+ * @param string $jump_back_to Optional. Can be 'previous' or page you want to jump back to.
+ *                             Default 'current'.
+ * @return string Original referer field.
+ */
+function wp_original_referer_field( $echo = true, $jump_back_to = 'current' ) {
+	if ( ! $ref = wp_get_original_referer() ) {
+		$ref = 'previous' == $jump_back_to ? wp_get_referer() : wp_unslash( $_SERVER['REQUEST_URI'] );
+	}
+	$orig_referer_field = '<input type="hidden" name="_wp_original_http_referer" value="' . esc_attr( $ref ) . '" />';
+	if ( $echo )
+		echo $orig_referer_field;
+	return $orig_referer_field;
+}
+
+/**
+ * Retrieve referer from '_wp_http_referer' or HTTP referer.
+ *
+ * If it's the same as the current request URL, will return false.
+ *
+ * @since 2.0.4
+ *
+ * @return false|string False on failure. Referer URL on success.
+ */
+function wp_get_referer() {
+	if ( ! function_exists( 'wp_validate_redirect' ) ) {
+		return false;
+	}
+
+	$ref = wp_get_raw_referer();
+
+	if ( $ref && $ref !== wp_unslash( $_SERVER['REQUEST_URI'] ) && $ref !== home_url() . wp_unslash( $_SERVER['REQUEST_URI'] ) ) {
+		return wp_validate_redirect( $ref, false );
+	}
+
+	return false;
+}
+
+/**
+ * Retrieves unvalidated referer from '_wp_http_referer' or HTTP referer.
+ *
+ * Do not use for redirects, use {@see wp_get_referer()} instead.
+ *
+ * @since 4.5.0
+ *
+ * @return string|false Referer URL on success, false on failure.
+ */
+function wp_get_raw_referer() {
+	if ( ! empty( $_REQUEST['_wp_http_referer'] ) ) {
+		return wp_unslash( $_REQUEST['_wp_http_referer'] );
+	} else if ( ! empty( $_SERVER['HTTP_REFERER'] ) ) {
+		return wp_unslash( $_SERVER['HTTP_REFERER'] );
+	}
+
+	return false;
+}
+
+/**
+ * Retrieve original referer that was posted, if it exists.
+ *
+ * @since 2.0.4
+ *
+ * @return string|false False if no original referer or original referer if set.
+ */
+function wp_get_original_referer() {
+	if ( ! empty( $_REQUEST['_wp_original_http_referer'] ) && function_exists( 'wp_validate_redirect' ) )
+		return wp_validate_redirect( wp_unslash( $_REQUEST['_wp_original_http_referer'] ), false );
+	return false;
+}
+
+/**
+ * Recursive directory creation based on full path.
+ *
+ * Will attempt to set permissions on folders.
+ *
+ * @since 2.0.1
+ *
+ * @param string $target Full path to attempt to create.
+ * @return bool Whether the path was created. True if path already exists.
+ */
+function wp_mkdir_p( $target ) {
+	$wrapper = null;
+
+	// Strip the protocol.
+	if ( wp_is_stream( $target ) ) {
+		list( $wrapper, $target ) = explode( '://', $target, 2 );
+	}
+
+	// From php.net/mkdir user contributed notes.
+	$target = str_replace( '//', '/', $target );
+
+	// Put the wrapper back on the target.
+	if ( $wrapper !== null ) {
+		$target = $wrapper . '://' . $target;
+	}
+
+	/*
+	 * Safe mode fails with a trailing slash under certain PHP versions.
+	 * Use rtrim() instead of untrailingslashit to avoid formatting.php dependency.
+	 */
+	$target = rtrim($target, '/');
+	if ( empty($target) )
+		$target = '/';
+
+	if ( file_exists( $target ) )
+		return @is_dir( $target );
+
+	// We need to find the permissions of the parent folder that exists and inherit that.
+	$target_parent = dirname( $target );
+	while ( '.' != $target_parent && ! is_dir( $target_parent ) ) {
+		$target_parent = dirname( $target_parent );
+	}
+
+	// Get the permission bits.
+	if ( $stat = @stat( $target_parent ) ) {
+		$dir_perms = $stat['mode'] & 0007777;
+	} else {
+		$dir_perms = 0777;
+	}
+
+	if ( @mkdir( $target, $dir_perms, true ) ) {
+
+		/*
+		 * If a umask is set that modifies $dir_perms, we'll have to re-set
+		 * the $dir_perms correctly with chmod()
+		 */
+		if ( $dir_perms != ( $dir_perms & ~umask() ) ) {
+			$folder_parts = explode( '/', substr( $target, strlen( $target_parent ) + 1 ) );
+			for ( $i = 1, $c = count( $folder_parts ); $i <= $c; $i++ ) {
+				@chmod( $target_parent . '/' . implode( '/', array_slice( $folder_parts, 0, $i ) ), $dir_perms );
+			}
+		}
+
+		return true;
+	}
+
+	return false;
+}
+
+/**
+ * Test if a give filesystem path is absolute.
+ *
+ * For example, '/foo/bar', or 'c:\windows'.
+ *
+ * @since 2.5.0
+ *
+ * @param string $path File path.
+ * @return bool True if path is absolute, false is not absolute.
+ */
+function path_is_absolute( $path ) {
+	/*
+	 * This is definitive if true but fails if $path does not exist or contains
+	 * a symbolic link.
+	 */
+	if ( realpath($path) == $path )
+		return true;
+
+	if ( strlen($path) == 0 || $path[0] == '.' )
+		return false;
+
+	// Windows allows absolute paths like this.
+	if ( preg_match('#^[a-zA-Z]:\\\\#', $path) )
+		return true;
+
+	// A path starting with / or \ is absolute; anything else is relative.
+	return ( $path[0] == '/' || $path[0] == '\\' );
+}
+
+/**
+ * Join two filesystem paths together.
+ *
+ * For example, 'give me $path relative to $base'. If the $path is absolute,
+ * then it the full path is returned.
+ *
+ * @since 2.5.0
+ *
+ * @param string $base Base path.
+ * @param string $path Path relative to $base.
+ * @return string The path with the base or absolute path.
+ */
+function path_join( $base, $path ) {
+	if ( path_is_absolute($path) )
+		return $path;
+
+	return rtrim($base, '/') . '/' . ltrim($path, '/');
+}
+
+/**
+ * Normalize a filesystem path.
+ *
+ * On windows systems, replaces backslashes with forward slashes
+ * and forces upper-case drive letters.
+ * Ensures that no duplicate slashes exist.
+ *
+ * @since 3.9.0
+ * @since 4.4.0 Ensures upper-case drive letters on Windows systems.
+ *
+ * @param string $path Path to normalize.
+ * @return string Normalized path.
+ */
+function wp_normalize_path( $path ) {
+	$path = str_replace( '\\', '/', $path );
+	$path = preg_replace( '|/+|','/', $path );
+	if ( ':' === substr( $path, 1, 1 ) ) {
+		$path = ucfirst( $path );
+	}
+	return $path;
+}
+
+/**
+ * Determine a writable directory for temporary files.
+ *
+ * Function's preference is the return value of sys_get_temp_dir(),
+ * followed by your PHP temporary upload directory, followed by WP_CONTENT_DIR,
+ * before finally defaulting to /tmp/
+ *
+ * In the event that this function does not find a writable location,
+ * It may be overridden by the WP_TEMP_DIR constant in your wp-config.php file.
+ *
+ * @since 2.5.0
+ *
+ * @staticvar string $temp
+ *
+ * @return string Writable temporary directory.
+ */
+function get_temp_dir() {
+	static $temp = '';
+	if ( defined('WP_TEMP_DIR') )
+		return trailingslashit(WP_TEMP_DIR);
+
+	if ( $temp )
+		return trailingslashit( $temp );
+
+	if ( function_exists('sys_get_temp_dir') ) {
+		$temp = sys_get_temp_dir();
+		if ( @is_dir( $temp ) && wp_is_writable( $temp ) )
+			return trailingslashit( $temp );
+	}
+
+	$temp = ini_get('upload_tmp_dir');
+	if ( @is_dir( $temp ) && wp_is_writable( $temp ) )
+		return trailingslashit( $temp );
+
+	$temp = WP_CONTENT_DIR . '/';
+	if ( is_dir( $temp ) && wp_is_writable( $temp ) )
+		return $temp;
+
+	return '/tmp/';
+}
+
+/**
+ * Determine if a directory is writable.
+ *
+ * This function is used to work around certain ACL issues in PHP primarily
+ * affecting Windows Servers.
+ *
+ * @since 3.6.0
+ *
+ * @see win_is_writable()
+ *
+ * @param string $path Path to check for write-ability.
+ * @return bool Whether the path is writable.
+ */
+function wp_is_writable( $path ) {
+	if ( 'WIN' === strtoupper( substr( PHP_OS, 0, 3 ) ) )
+		return win_is_writable( $path );
+	else
+		return @is_writable( $path );
+}
+
+/**
+ * Workaround for Windows bug in is_writable() function
+ *
+ * PHP has issues with Windows ACL's for determine if a
+ * directory is writable or not, this works around them by
+ * checking the ability to open files rather than relying
+ * upon PHP to interprate the OS ACL.
+ *
+ * @since 2.8.0
+ *
+ * @see http://bugs.php.net/bug.php?id=27609
+ * @see http://bugs.php.net/bug.php?id=30931
+ *
+ * @param string $path Windows path to check for write-ability.
+ * @return bool Whether the path is writable.
+ */
+function win_is_writable( $path ) {
+
+	if ( $path[strlen( $path ) - 1] == '/' ) { // if it looks like a directory, check a random file within the directory
+		return win_is_writable( $path . uniqid( mt_rand() ) . '.tmp');
+	} elseif ( is_dir( $path ) ) { // If it's a directory (and not a file) check a random file within the directory
+		return win_is_writable( $path . '/' . uniqid( mt_rand() ) . '.tmp' );
+	}
+	// check tmp file for read/write capabilities
+	$should_delete_tmp_file = !file_exists( $path );
+	$f = @fopen( $path, 'a' );
+	if ( $f === false )
+		return false;
+	fclose( $f );
+	if ( $should_delete_tmp_file )
+		unlink( $path );
+	return true;
+}
+
+/**
+ * Get uploads directory information.
+ *
+ * Same as wp_upload_dir() but "light weight" as it doesn't attempt to create the uploads directory.
+ * Intended for use in themes, when only 'basedir' and 'baseurl' are needed, generally in all cases when not uploading files.
+ *
+ * @since 4.5.0
+ *
+ * @return array See wp_upload_dir() for description.
+ */
+function wp_get_upload_dir() {
+	return wp_upload_dir( null, false );
+}
+
+/**
+ * Get an array containing the current upload directory's path and url.
+ *
+ * Checks the 'upload_path' option, which should be from the web root folder,
+ * and if it isn't empty it will be used. If it is empty, then the path will be
+ * 'WP_CONTENT_DIR/uploads'. If the 'UPLOADS' constant is defined, then it will
+ * override the 'upload_path' option and 'WP_CONTENT_DIR/uploads' path.
+ *
+ * The upload URL path is set either by the 'upload_url_path' option or by using
+ * the 'WP_CONTENT_URL' constant and appending '/uploads' to the path.
+ *
+ * If the 'uploads_use_yearmonth_folders' is set to true (checkbox if checked in
+ * the administration settings panel), then the time will be used. The format
+ * will be year first and then month.
+ *
+ * If the path couldn't be created, then an error will be returned with the key
+ * 'error' containing the error message. The error suggests that the parent
+ * directory is not writable by the server.
+ *
+ * On success, the returned array will have many indices:
+ * 'path' - base directory and sub directory or full path to upload directory.
+ * 'url' - base url and sub directory or absolute URL to upload directory.
+ * 'subdir' - sub directory if uploads use year/month folders option is on.
+ * 'basedir' - path without subdir.
+ * 'baseurl' - URL path without subdir.
+ * 'error' - false or error message.
+ *
+ * @since 2.0.0
+ * @uses _wp_upload_dir()
+ *
+ * @param string $time Optional. Time formatted in 'yyyy/mm'. Default null.
+ * @param bool   $create_dir Optional. Whether to check and create the uploads directory. Default true (backwards compatible).
+ * @param bool   $refresh_cache Optional. Whether to refresh the cache. Default false.
+ * @return array See above for description.
+ */
+function wp_upload_dir( $time = null, $create_dir = true, $refresh_cache = false ) {
+	static $cache = array();
+
+	$key = sprintf( '%d-%s', get_current_blog_id(), (string) $time );
+
+	if ( $refresh_cache || empty( $cache[ $key ] ) ) {
+		$cache[ $key ] = _wp_upload_dir( $time );
+	}
+
+	/**
+	 * Filter the uploads directory data.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param array $uploads Array of upload directory data with keys of 'path',
+	 *                       'url', 'subdir, 'basedir', and 'error'.
+	 */
+	$uploads = apply_filters( 'upload_dir', $cache[ $key ] );
+
+	if ( $create_dir ) {
+		$path = $uploads['path'];
+		$tested_paths = wp_cache_get( 'upload_dir_tested_paths' );
+
+		if ( ! is_array( $tested_paths ) ) {
+			$tested_paths = array();
+		}
+
+		if ( ! in_array( $path, $tested_paths, true ) ) {
+			if ( ! wp_mkdir_p( $path ) ) {
+				if ( 0 === strpos( $uploads['basedir'], ABSPATH ) ) {
+					$error_path = str_replace( ABSPATH, '', $uploads['basedir'] ) . $uploads['subdir'];
+				} else {
+					$error_path = basename( $uploads['basedir'] ) . $uploads['subdir'];
+				}
+
+				$uploads['error'] = sprintf( __( 'Unable to create directory %s. Is its parent directory writable by the server?' ), esc_html( $error_path ) );
+			} else {
+				$tested_paths[] = $path;
+				wp_cache_set( 'upload_dir_tested_paths', $tested_paths );
+			}
+		}
+	}
+
+	return $uploads;
+}
+
+/**
+ * A non-filtered, non-cached version of wp_upload_dir() that doesn't check the path.
+ *
+ * @access private
+ *
+ * @param string $time Optional. Time formatted in 'yyyy/mm'. Default null.
+ * @return array See wp_upload_dir()
+ */
+function _wp_upload_dir( $time = null ) {
+	$siteurl = get_option( 'siteurl' );
+	$upload_path = trim( get_option( 'upload_path' ) );
+
+	if ( empty( $upload_path ) || 'wp-content/uploads' == $upload_path ) {
+		$dir = WP_CONTENT_DIR . '/uploads';
+	} elseif ( 0 !== strpos( $upload_path, ABSPATH ) ) {
+		// $dir is absolute, $upload_path is (maybe) relative to ABSPATH
+		$dir = path_join( ABSPATH, $upload_path );
+	} else {
+		$dir = $upload_path;
+	}
+
+	if ( !$url = get_option( 'upload_url_path' ) ) {
+		if ( empty($upload_path) || ( 'wp-content/uploads' == $upload_path ) || ( $upload_path == $dir ) )
+			$url = WP_CONTENT_URL . '/uploads';
+		else
+			$url = trailingslashit( $siteurl ) . $upload_path;
+	}
+
+	/*
+	 * Honor the value of UPLOADS. This happens as long as ms-files rewriting is disabled.
+	 * We also sometimes obey UPLOADS when rewriting is enabled -- see the next block.
+	 */
+	if ( defined( 'UPLOADS' ) && ! ( is_multisite() && get_site_option( 'ms_files_rewriting' ) ) ) {
+		$dir = ABSPATH . UPLOADS;
+		$url = trailingslashit( $siteurl ) . UPLOADS;
+	}
+
+	// If multisite (and if not the main site in a post-MU network)
+	if ( is_multisite() && ! ( is_main_network() && is_main_site() && defined( 'MULTISITE' ) ) ) {
+
+		if ( ! get_site_option( 'ms_files_rewriting' ) ) {
+			/*
+			 * If ms-files rewriting is disabled (networks created post-3.5), it is fairly
+			 * straightforward: Append sites/%d if we're not on the main site (for post-MU
+			 * networks). (The extra directory prevents a four-digit ID from conflicting with
+			 * a year-based directory for the main site. But if a MU-era network has disabled
+			 * ms-files rewriting manually, they don't need the extra directory, as they never
+			 * had wp-content/uploads for the main site.)
+			 */
+
+			if ( defined( 'MULTISITE' ) )
+				$ms_dir = '/sites/' . get_current_blog_id();
+			else
+				$ms_dir = '/' . get_current_blog_id();
+
+			$dir .= $ms_dir;
+			$url .= $ms_dir;
+
+		} elseif ( defined( 'UPLOADS' ) && ! ms_is_switched() ) {
+			/*
+			 * Handle the old-form ms-files.php rewriting if the network still has that enabled.
+			 * When ms-files rewriting is enabled, then we only listen to UPLOADS when:
+			 * 1) We are not on the main site in a post-MU network, as wp-content/uploads is used
+			 *    there, and
+			 * 2) We are not switched, as ms_upload_constants() hardcodes these constants to reflect
+			 *    the original blog ID.
+			 *
+			 * Rather than UPLOADS, we actually use BLOGUPLOADDIR if it is set, as it is absolute.
+			 * (And it will be set, see ms_upload_constants().) Otherwise, UPLOADS can be used, as
+			 * as it is relative to ABSPATH. For the final piece: when UPLOADS is used with ms-files
+			 * rewriting in multisite, the resulting URL is /files. (#WP22702 for background.)
+			 */
+
+			if ( defined( 'BLOGUPLOADDIR' ) )
+				$dir = untrailingslashit( BLOGUPLOADDIR );
+			else
+				$dir = ABSPATH . UPLOADS;
+			$url = trailingslashit( $siteurl ) . 'files';
+		}
+	}
+
+	$basedir = $dir;
+	$baseurl = $url;
+
+	$subdir = '';
+	if ( get_option( 'uploads_use_yearmonth_folders' ) ) {
+		// Generate the yearly and monthly dirs
+		if ( !$time )
+			$time = current_time( 'mysql' );
+		$y = substr( $time, 0, 4 );
+		$m = substr( $time, 5, 2 );
+		$subdir = "/$y/$m";
+	}
+
+	$dir .= $subdir;
+	$url .= $subdir;
+
+	return array(
+		'path'    => $dir,
+		'url'     => $url,
+		'subdir'  => $subdir,
+		'basedir' => $basedir,
+		'baseurl' => $baseurl,
+		'error'   => false,
+	);
+}
+
+/**
+ * Get a filename that is sanitized and unique for the given directory.
+ *
+ * If the filename is not unique, then a number will be added to the filename
+ * before the extension, and will continue adding numbers until the filename is
+ * unique.
+ *
+ * The callback is passed three parameters, the first one is the directory, the
+ * second is the filename, and the third is the extension.
+ *
+ * @since 2.5.0
+ *
+ * @param string   $dir                      Directory.
+ * @param string   $filename                 File name.
+ * @param callable $unique_filename_callback Callback. Default null.
+ * @return string New filename, if given wasn't unique.
+ */
+function wp_unique_filename( $dir, $filename, $unique_filename_callback = null ) {
+	// Sanitize the file name before we begin processing.
+	$filename = sanitize_file_name($filename);
+
+	// Separate the filename into a name and extension.
+	$info = pathinfo($filename);
+	$ext = !empty($info['extension']) ? '.' . $info['extension'] : '';
+	$name = basename($filename, $ext);
+
+	// Edge case: if file is named '.ext', treat as an empty name.
+	if ( $name === $ext )
+		$name = '';
+
+	/*
+	 * Increment the file number until we have a unique file to save in $dir.
+	 * Use callback if supplied.
+	 */
+	if ( $unique_filename_callback && is_callable( $unique_filename_callback ) ) {
+		$filename = call_user_func( $unique_filename_callback, $dir, $name, $ext );
+	} else {
+		$number = '';
+
+		// Change '.ext' to lower case.
+		if ( $ext && strtolower($ext) != $ext ) {
+			$ext2 = strtolower($ext);
+			$filename2 = preg_replace( '|' . preg_quote($ext) . '$|', $ext2, $filename );
+
+			// Check for both lower and upper case extension or image sub-sizes may be overwritten.
+			while ( file_exists($dir . "/$filename") || file_exists($dir . "/$filename2") ) {
+				$new_number = $number + 1;
+				$filename = str_replace( array( "-$number$ext", "$number$ext" ), "-$new_number$ext", $filename );
+				$filename2 = str_replace( array( "-$number$ext2", "$number$ext2" ), "-$new_number$ext2", $filename2 );
+				$number = $new_number;
+			}
+
+			/**
+			 * Filter the result when generating a unique file name.
+			 *
+			 * @since 4.5.0
+			 *
+			 * @param string        $filename                 Unique file name.
+			 * @param string        $ext                      File extension, eg. ".png".
+			 * @param string        $dir                      Directory path.
+			 * @param callable|null $unique_filename_callback Callback function that generates the unique file name.
+			 */
+			return apply_filters( 'wp_unique_filename', $filename2, $ext, $dir, $unique_filename_callback );
+		}
+
+		while ( file_exists( $dir . "/$filename" ) ) {
+			if ( '' == "$number$ext" ) {
+				$filename = "$filename-" . ++$number;
+			} else {
+				$filename = str_replace( array( "-$number$ext", "$number$ext" ), "-" . ++$number . $ext, $filename );
+			}
+		}
+	}
+
+	/** This filter is documented in wp-includes/functions.php */
+	return apply_filters( 'wp_unique_filename', $filename, $ext, $dir, $unique_filename_callback );
+}
+
+/**
+ * Create a file in the upload folder with given content.
+ *
+ * If there is an error, then the key 'error' will exist with the error message.
+ * If success, then the key 'file' will have the unique file path, the 'url' key
+ * will have the link to the new file. and the 'error' key will be set to false.
+ *
+ * This function will not move an uploaded file to the upload folder. It will
+ * create a new file with the content in $bits parameter. If you move the upload
+ * file, read the content of the uploaded file, and then you can give the
+ * filename and content to this function, which will add it to the upload
+ * folder.
+ *
+ * The permissions will be set on the new file automatically by this function.
+ *
+ * @since 2.0.0
+ *
+ * @param string       $name       Filename.
+ * @param null|string  $deprecated Never used. Set to null.
+ * @param mixed        $bits       File content
+ * @param string       $time       Optional. Time formatted in 'yyyy/mm'. Default null.
+ * @return array
+ */
+function wp_upload_bits( $name, $deprecated, $bits, $time = null ) {
+	if ( !empty( $deprecated ) )
+		_deprecated_argument( __FUNCTION__, '2.0' );
+
+	if ( empty( $name ) )
+		return array( 'error' => __( 'Empty filename' ) );
+
+	$wp_filetype = wp_check_filetype( $name );
+	if ( ! $wp_filetype['ext'] && ! current_user_can( 'unfiltered_upload' ) )
+		return array( 'error' => __( 'Invalid file type' ) );
+
+	$upload = wp_upload_dir( $time );
+
+	if ( $upload['error'] !== false )
+		return $upload;
+
+	/**
+	 * Filter whether to treat the upload bits as an error.
+	 *
+	 * Passing a non-array to the filter will effectively short-circuit preparing
+	 * the upload bits, returning that value instead.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param mixed $upload_bits_error An array of upload bits data, or a non-array error to return.
+	 */
+	$upload_bits_error = apply_filters( 'wp_upload_bits', array( 'name' => $name, 'bits' => $bits, 'time' => $time ) );
+	if ( !is_array( $upload_bits_error ) ) {
+		$upload[ 'error' ] = $upload_bits_error;
+		return $upload;
+	}
+
+	$filename = wp_unique_filename( $upload['path'], $name );
+
+	$new_file = $upload['path'] . "/$filename";
+	if ( ! wp_mkdir_p( dirname( $new_file ) ) ) {
+		if ( 0 === strpos( $upload['basedir'], ABSPATH ) )
+			$error_path = str_replace( ABSPATH, '', $upload['basedir'] ) . $upload['subdir'];
+		else
+			$error_path = basename( $upload['basedir'] ) . $upload['subdir'];
+
+		$message = sprintf( __( 'Unable to create directory %s. Is its parent directory writable by the server?' ), $error_path );
+		return array( 'error' => $message );
+	}
+
+	$ifp = @ fopen( $new_file, 'wb' );
+	if ( ! $ifp )
+		return array( 'error' => sprintf( __( 'Could not write file %s' ), $new_file ) );
+
+	@fwrite( $ifp, $bits );
+	fclose( $ifp );
+	clearstatcache();
+
+	// Set correct file permissions
+	$stat = @ stat( dirname( $new_file ) );
+	$perms = $stat['mode'] & 0007777;
+	$perms = $perms & 0000666;
+	@ chmod( $new_file, $perms );
+	clearstatcache();
+
+	// Compute the URL
+	$url = $upload['url'] . "/$filename";
+
+	/** This filter is documented in wp-admin/includes/file.php */
+	return apply_filters( 'wp_handle_upload', array( 'file' => $new_file, 'url' => $url, 'type' => $wp_filetype['type'], 'error' => false ), 'sideload' );
+}
+
+/**
+ * Retrieve the file type based on the extension name.
+ *
+ * @since 2.5.0
+ *
+ * @param string $ext The extension to search.
+ * @return string|void The file type, example: audio, video, document, spreadsheet, etc.
+ */
+function wp_ext2type( $ext ) {
+	$ext = strtolower( $ext );
+
+	/**
+	 * Filter file type based on the extension name.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @see wp_ext2type()
+	 *
+	 * @param array $ext2type Multi-dimensional array with extensions for a default set
+	 *                        of file types.
+	 */
+	$ext2type = apply_filters( 'ext2type', array(
+		'image'       => array( 'jpg', 'jpeg', 'jpe',  'gif',  'png',  'bmp',   'tif',  'tiff', 'ico' ),
+		'audio'       => array( 'aac', 'ac3',  'aif',  'aiff', 'm3a',  'm4a',   'm4b',  'mka',  'mp1',  'mp2',  'mp3', 'ogg', 'oga', 'ram', 'wav', 'wma' ),
+		'video'       => array( '3g2',  '3gp', '3gpp', 'asf', 'avi',  'divx', 'dv',   'flv',  'm4v',   'mkv',  'mov',  'mp4',  'mpeg', 'mpg', 'mpv', 'ogm', 'ogv', 'qt',  'rm', 'vob', 'wmv' ),
+		'document'    => array( 'doc', 'docx', 'docm', 'dotm', 'odt',  'pages', 'pdf',  'xps',  'oxps', 'rtf',  'wp', 'wpd', 'psd', 'xcf' ),
+		'spreadsheet' => array( 'numbers',     'ods',  'xls',  'xlsx', 'xlsm',  'xlsb' ),
+		'interactive' => array( 'swf', 'key',  'ppt',  'pptx', 'pptm', 'pps',   'ppsx', 'ppsm', 'sldx', 'sldm', 'odp' ),
+		'text'        => array( 'asc', 'csv',  'tsv',  'txt' ),
+		'archive'     => array( 'bz2', 'cab',  'dmg',  'gz',   'rar',  'sea',   'sit',  'sqx',  'tar',  'tgz',  'zip', '7z' ),
+		'code'        => array( 'css', 'htm',  'html', 'php',  'js' ),
+	) );
+
+	foreach ( $ext2type as $type => $exts )
+		if ( in_array( $ext, $exts ) )
+			return $type;
+}
+
+/**
+ * Retrieve the file type from the file name.
+ *
+ * You can optionally define the mime array, if needed.
+ *
+ * @since 2.0.4
+ *
+ * @param string $filename File name or path.
+ * @param array  $mimes    Optional. Key is the file extension with value as the mime type.
+ * @return array Values with extension first and mime type.
+ */
+function wp_check_filetype( $filename, $mimes = null ) {
+	if ( empty($mimes) )
+		$mimes = get_allowed_mime_types();
+	$type = false;
+	$ext = false;
+
+	foreach ( $mimes as $ext_preg => $mime_match ) {
+		$ext_preg = '!\.(' . $ext_preg . ')$!i';
+		if ( preg_match( $ext_preg, $filename, $ext_matches ) ) {
+			$type = $mime_match;
+			$ext = $ext_matches[1];
+			break;
+		}
+	}
+
+	return compact( 'ext', 'type' );
+}
+
+/**
+ * Attempt to determine the real file type of a file.
+ *
+ * If unable to, the file name extension will be used to determine type.
+ *
+ * If it's determined that the extension does not match the file's real type,
+ * then the "proper_filename" value will be set with a proper filename and extension.
+ *
+ * Currently this function only supports validating images known to getimagesize().
+ *
+ * @since 3.0.0
+ *
+ * @param string $file     Full path to the file.
+ * @param string $filename The name of the file (may differ from $file due to $file being
+ *                         in a tmp directory).
+ * @param array   $mimes   Optional. Key is the file extension with value as the mime type.
+ * @return array Values for the extension, MIME, and either a corrected filename or false
+ *               if original $filename is valid.
+ */
+function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
+	$proper_filename = false;
+
+	// Do basic extension validation and MIME mapping
+	$wp_filetype = wp_check_filetype( $filename, $mimes );
+	$ext = $wp_filetype['ext'];
+	$type = $wp_filetype['type'];
+
+	// We can't do any further validation without a file to work with
+	if ( ! file_exists( $file ) ) {
+		return compact( 'ext', 'type', 'proper_filename' );
+	}
+
+	// We're able to validate images using GD
+	if ( $type && 0 === strpos( $type, 'image/' ) && function_exists('getimagesize') ) {
+
+		// Attempt to figure out what type of image it actually is
+		$imgstats = @getimagesize( $file );
+
+		// If getimagesize() knows what kind of image it really is and if the real MIME doesn't match the claimed MIME
+		if ( !empty($imgstats['mime']) && $imgstats['mime'] != $type ) {
+			/**
+			 * Filter the list mapping image mime types to their respective extensions.
+			 *
+			 * @since 3.0.0
+			 *
+			 * @param  array $mime_to_ext Array of image mime types and their matching extensions.
+			 */
+			$mime_to_ext = apply_filters( 'getimagesize_mimes_to_exts', array(
+				'image/jpeg' => 'jpg',
+				'image/png'  => 'png',
+				'image/gif'  => 'gif',
+				'image/bmp'  => 'bmp',
+				'image/tiff' => 'tif',
+			) );
+
+			// Replace whatever is after the last period in the filename with the correct extension
+			if ( ! empty( $mime_to_ext[ $imgstats['mime'] ] ) ) {
+				$filename_parts = explode( '.', $filename );
+				array_pop( $filename_parts );
+				$filename_parts[] = $mime_to_ext[ $imgstats['mime'] ];
+				$new_filename = implode( '.', $filename_parts );
+
+				if ( $new_filename != $filename ) {
+					$proper_filename = $new_filename; // Mark that it changed
+				}
+				// Redefine the extension / MIME
+				$wp_filetype = wp_check_filetype( $new_filename, $mimes );
+				$ext = $wp_filetype['ext'];
+				$type = $wp_filetype['type'];
+			}
+		}
+	}
+
+	/**
+	 * Filter the "real" file type of the given file.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param array  $wp_check_filetype_and_ext File data array containing 'ext', 'type', and
+	 *                                          'proper_filename' keys.
+	 * @param string $file                      Full path to the file.
+	 * @param string $filename                  The name of the file (may differ from $file due to
+	 *                                          $file being in a tmp directory).
+	 * @param array  $mimes                     Key is the file extension with value as the mime type.
+	 */
+	return apply_filters( 'wp_check_filetype_and_ext', compact( 'ext', 'type', 'proper_filename' ), $file, $filename, $mimes );
+}
+
+/**
+ * Retrieve list of mime types and file extensions.
+ *
+ * @since 3.5.0
+ * @since 4.2.0 Support was added for GIMP (xcf) files.
+ *
+ * @return array Array of mime types keyed by the file extension regex corresponding to those types.
+ */
+function wp_get_mime_types() {
+	/**
+	 * Filter the list of mime types and file extensions.
+	 *
+	 * This filter should be used to add, not remove, mime types. To remove
+	 * mime types, use the 'upload_mimes' filter.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @param array $wp_get_mime_types Mime types keyed by the file extension regex
+	 *                                 corresponding to those types.
+	 */
+	return apply_filters( 'mime_types', array(
+	// Image formats.
+	'jpg|jpeg|jpe' => 'image/jpeg',
+	'gif' => 'image/gif',
+	'png' => 'image/png',
+	'bmp' => 'image/bmp',
+	'tiff|tif' => 'image/tiff',
+	'ico' => 'image/x-icon',
+	// Video formats.
+	'asf|asx' => 'video/x-ms-asf',
+	'wmv' => 'video/x-ms-wmv',
+	'wmx' => 'video/x-ms-wmx',
+	'wm' => 'video/x-ms-wm',
+	'avi' => 'video/avi',
+	'divx' => 'video/divx',
+	'flv' => 'video/x-flv',
+	'mov|qt' => 'video/quicktime',
+	'mpeg|mpg|mpe' => 'video/mpeg',
+	'mp4|m4v' => 'video/mp4',
+	'ogv' => 'video/ogg',
+	'webm' => 'video/webm',
+	'mkv' => 'video/x-matroska',
+	'3gp|3gpp' => 'video/3gpp', // Can also be audio
+	'3g2|3gp2' => 'video/3gpp2', // Can also be audio
+	// Text formats.
+	'txt|asc|c|cc|h|srt' => 'text/plain',
+	'csv' => 'text/csv',
+	'tsv' => 'text/tab-separated-values',
+	'ics' => 'text/calendar',
+	'rtx' => 'text/richtext',
+	'css' => 'text/css',
+	'htm|html' => 'text/html',
+	'vtt' => 'text/vtt',
+	'dfxp' => 'application/ttaf+xml',
+	// Audio formats.
+	'mp3|m4a|m4b' => 'audio/mpeg',
+	'ra|ram' => 'audio/x-realaudio',
+	'wav' => 'audio/wav',
+	'ogg|oga' => 'audio/ogg',
+	'mid|midi' => 'audio/midi',
+	'wma' => 'audio/x-ms-wma',
+	'wax' => 'audio/x-ms-wax',
+	'mka' => 'audio/x-matroska',
+	// Misc application formats.
+	'rtf' => 'application/rtf',
+	'js' => 'application/javascript',
+	'pdf' => 'application/pdf',
+	'swf' => 'application/x-shockwave-flash',
+	'class' => 'application/java',
+	'tar' => 'application/x-tar',
+	'zip' => 'application/zip',
+	'gz|gzip' => 'application/x-gzip',
+	'rar' => 'application/rar',
+	'7z' => 'application/x-7z-compressed',
+	'exe' => 'application/x-msdownload',
+	'psd' => 'application/octet-stream',
+	'xcf' => 'application/octet-stream',
+	// MS Office formats.
+	'doc' => 'application/msword',
+	'pot|pps|ppt' => 'application/vnd.ms-powerpoint',
+	'wri' => 'application/vnd.ms-write',
+	'xla|xls|xlt|xlw' => 'application/vnd.ms-excel',
+	'mdb' => 'application/vnd.ms-access',
+	'mpp' => 'application/vnd.ms-project',
+	'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+	'docm' => 'application/vnd.ms-word.document.macroEnabled.12',
+	'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
+	'dotm' => 'application/vnd.ms-word.template.macroEnabled.12',
+	'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+	'xlsm' => 'application/vnd.ms-excel.sheet.macroEnabled.12',
+	'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
+	'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
+	'xltm' => 'application/vnd.ms-excel.template.macroEnabled.12',
+	'xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12',
+	'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+	'pptm' => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12',
+	'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
+	'ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12',
+	'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
+	'potm' => 'application/vnd.ms-powerpoint.template.macroEnabled.12',
+	'ppam' => 'application/vnd.ms-powerpoint.addin.macroEnabled.12',
+	'sldx' => 'application/vnd.openxmlformats-officedocument.presentationml.slide',
+	'sldm' => 'application/vnd.ms-powerpoint.slide.macroEnabled.12',
+	'onetoc|onetoc2|onetmp|onepkg' => 'application/onenote',
+	'oxps' => 'application/oxps',
+	'xps' => 'application/vnd.ms-xpsdocument',
+	// OpenOffice formats.
+	'odt' => 'application/vnd.oasis.opendocument.text',
+	'odp' => 'application/vnd.oasis.opendocument.presentation',
+	'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
+	'odg' => 'application/vnd.oasis.opendocument.graphics',
+	'odc' => 'application/vnd.oasis.opendocument.chart',
+	'odb' => 'application/vnd.oasis.opendocument.database',
+	'odf' => 'application/vnd.oasis.opendocument.formula',
+	// WordPerfect formats.
+	'wp|wpd' => 'application/wordperfect',
+	// iWork formats.
+	'key' => 'application/vnd.apple.keynote',
+	'numbers' => 'application/vnd.apple.numbers',
+	'pages' => 'application/vnd.apple.pages',
+	) );
+}
+/**
+ * Retrieve list of allowed mime types and file extensions.
+ *
+ * @since 2.8.6
+ *
+ * @param int|WP_User $user Optional. User to check. Defaults to current user.
+ * @return array Array of mime types keyed by the file extension regex corresponding
+ *               to those types.
+ */
+function get_allowed_mime_types( $user = null ) {
+	$t = wp_get_mime_types();
+
+	unset( $t['swf'], $t['exe'] );
+	if ( function_exists( 'current_user_can' ) )
+		$unfiltered = $user ? user_can( $user, 'unfiltered_html' ) : current_user_can( 'unfiltered_html' );
+
+	if ( empty( $unfiltered ) )
+		unset( $t['htm|html'] );
+
+	/**
+	 * Filter list of allowed mime types and file extensions.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param array            $t    Mime types keyed by the file extension regex corresponding to
+	 *                               those types. 'swf' and 'exe' removed from full list. 'htm|html' also
+	 *                               removed depending on '$user' capabilities.
+	 * @param int|WP_User|null $user User ID, User object or null if not provided (indicates current user).
+	 */
+	return apply_filters( 'upload_mimes', $t, $user );
+}
+
+/**
+ * Display "Are You Sure" message to confirm the action being taken.
+ *
+ * If the action has the nonce explain message, then it will be displayed
+ * along with the "Are you sure?" message.
+ *
+ * @since 2.0.4
+ *
+ * @param string $action The nonce action.
+ */
+function wp_nonce_ays( $action ) {
+	if ( 'log-out' == $action ) {
+		$html = sprintf( __( 'You are attempting to log out of %s' ), get_bloginfo( 'name' ) ) . '</p><p>';
+		$redirect_to = isset( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : '';
+		$html .= sprintf( __( "Do you really want to <a href='%s'>log out</a>?"), wp_logout_url( $redirect_to ) );
+	} else {
+		$html = __( 'Are you sure you want to do this?' );
+		if ( wp_get_referer() )
+			$html .= "</p><p><a href='" . esc_url( remove_query_arg( 'updated', wp_get_referer() ) ) . "'>" . __( 'Please try again.' ) . "</a>";
+	}
+
+	wp_die( $html, __( 'WordPress Failure Notice' ), 403 );
+}
+
+/**
+ * Kill WordPress execution and display HTML message with error message.
+ *
+ * This function complements the `die()` PHP function. The difference is that
+ * HTML will be displayed to the user. It is recommended to use this function
+ * only when the execution should not continue any further. It is not recommended
+ * to call this function very often, and try to handle as many errors as possible
+ * silently or more gracefully.
+ *
+ * As a shorthand, the desired HTTP response code may be passed as an integer to
+ * the `$title` parameter (the default title would apply) or the `$args` parameter.
+ *
+ * @since 2.0.4
+ * @since 4.1.0 The `$title` and `$args` parameters were changed to optionally accept
+ *              an integer to be used as the response code.
+ *
+ * @param string|WP_Error  $message Optional. Error message. If this is a {@see WP_Error} object,
+ *                                  the error's messages are used. Default empty.
+ * @param string|int       $title   Optional. Error title. If `$message` is a `WP_Error` object,
+ *                                  error data with the key 'title' may be used to specify the title.
+ *                                  If `$title` is an integer, then it is treated as the response
+ *                                  code. Default empty.
+ * @param string|array|int $args {
+ *     Optional. Arguments to control behavior. If `$args` is an integer, then it is treated
+ *     as the response code. Default empty array.
+ *
+ *     @type int    $response       The HTTP response code. Default 500.
+ *     @type bool   $back_link      Whether to include a link to go back. Default false.
+ *     @type string $text_direction The text direction. This is only useful internally, when WordPress
+ *                                  is still loading and the site's locale is not set up yet. Accepts 'rtl'.
+ *                                  Default is the value of {@see is_rtl()}.
+ * }
+ */
+function wp_die( $message = '', $title = '', $args = array() ) {
+
+	if ( is_int( $args ) ) {
+		$args = array( 'response' => $args );
+	} elseif ( is_int( $title ) ) {
+		$args  = array( 'response' => $title );
+		$title = '';
+	}
+
+	if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
+		/**
+		 * Filter callback for killing WordPress execution for AJAX requests.
+		 *
+		 * @since 3.4.0
+		 *
+		 * @param callable $function Callback function name.
+		 */
+		$function = apply_filters( 'wp_die_ajax_handler', '_ajax_wp_die_handler' );
+	} elseif ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST ) {
+		/**
+		 * Filter callback for killing WordPress execution for XML-RPC requests.
+		 *
+		 * @since 3.4.0
+		 *
+		 * @param callable $function Callback function name.
+		 */
+		$function = apply_filters( 'wp_die_xmlrpc_handler', '_xmlrpc_wp_die_handler' );
+	} else {
+		/**
+		 * Filter callback for killing WordPress execution for all non-AJAX, non-XML-RPC requests.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param callable $function Callback function name.
+		 */
+		$function = apply_filters( 'wp_die_handler', '_default_wp_die_handler' );
+	}
+
+	call_user_func( $function, $message, $title, $args );
+}
+
+/**
+ * Kill WordPress execution and display HTML message with error message.
+ *
+ * This is the default handler for wp_die if you want a custom one for your
+ * site then you can overload using the wp_die_handler filter in wp_die
+ *
+ * @since 3.0.0
+ * @access private
+ *
+ * @param string       $message Error message.
+ * @param string       $title   Optional. Error title. Default empty.
+ * @param string|array $args    Optional. Arguments to control behavior. Default empty array.
+ */
+function _default_wp_die_handler( $message, $title = '', $args = array() ) {
+	$defaults = array( 'response' => 500 );
+	$r = wp_parse_args($args, $defaults);
+
+	$have_gettext = function_exists('__');
+
+	if ( function_exists( 'is_wp_error' ) && is_wp_error( $message ) ) {
+		if ( empty( $title ) ) {
+			$error_data = $message->get_error_data();
+			if ( is_array( $error_data ) && isset( $error_data['title'] ) )
+				$title = $error_data['title'];
+		}
+		$errors = $message->get_error_messages();
+		switch ( count( $errors ) ) {
+		case 0 :
+			$message = '';
+			break;
+		case 1 :
+			$message = "<p>{$errors[0]}</p>";
+			break;
+		default :
+			$message = "<ul>\n\t\t<li>" . join( "</li>\n\t\t<li>", $errors ) . "</li>\n\t</ul>";
+			break;
+		}
+	} elseif ( is_string( $message ) ) {
+		$message = "<p>$message</p>";
+	}
+
+	if ( isset( $r['back_link'] ) && $r['back_link'] ) {
+		$back_text = $have_gettext? __('&laquo; Back') : '&laquo; Back';
+		$message .= "\n<p><a href='javascript:history.back()'>$back_text</a></p>";
+	}
+
+	if ( ! did_action( 'admin_head' ) ) :
+		if ( !headers_sent() ) {
+			status_header( $r['response'] );
+			nocache_headers();
+			header( 'Content-Type: text/html; charset=utf-8' );
+		}
+
+		if ( empty($title) )
+			$title = $have_gettext ? __('WordPress &rsaquo; Error') : 'WordPress &rsaquo; Error';
+
+		$text_direction = 'ltr';
+		if ( isset($r['text_direction']) && 'rtl' == $r['text_direction'] )
+			$text_direction = 'rtl';
+		elseif ( function_exists( 'is_rtl' ) && is_rtl() )
+			$text_direction = 'rtl';
+?>
+<!DOCTYPE html>
+<!-- Ticket #11289, IE bug fix: always pad the error page with enough characters such that it is greater than 512 bytes, even after gzip compression abcdefghijklmnopqrstuvwxyz1234567890aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz11223344556677889900abacbcbdcdcededfefegfgfhghgihihjijikjkjlklkmlmlnmnmononpopoqpqprqrqsrsrtstsubcbcdcdedefefgfabcadefbghicjkldmnoepqrfstugvwxhyz1i234j567k890laabmbccnddeoeffpgghqhiirjjksklltmmnunoovppqwqrrxsstytuuzvvw0wxx1yyz2z113223434455666777889890091abc2def3ghi4jkl5mno6pqr7stu8vwx9yz11aab2bcc3dd4ee5ff6gg7hh8ii9j0jk1kl2lmm3nnoo4p5pq6qrr7ss8tt9uuvv0wwx1x2yyzz13aba4cbcb5dcdc6dedfef8egf9gfh0ghg1ihi2hji3jik4jkj5lkl6kml7mln8mnm9ono
+-->
+<html xmlns="http://www.w3.org/1999/xhtml" <?php if ( function_exists( 'language_attributes' ) && function_exists( 'is_rtl' ) ) language_attributes(); else echo "dir='$text_direction'"; ?>>
+<head>
+	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+	<meta name="viewport" content="width=device-width">
+	<title><?php echo $title ?></title>
+	<style type="text/css">
+		html {
+			background: #f1f1f1;
+		}
+		body {
+			background: #fff;
+			color: #444;
+			font-family: "Open Sans", sans-serif;
+			margin: 2em auto;
+			padding: 1em 2em;
+			max-width: 700px;
+			-webkit-box-shadow: 0 1px 3px rgba(0,0,0,0.13);
+			box-shadow: 0 1px 3px rgba(0,0,0,0.13);
+		}
+		h1 {
+			border-bottom: 1px solid #dadada;
+			clear: both;
+			color: #666;
+			font: 24px "Open Sans", sans-serif;
+			margin: 30px 0 0 0;
+			padding: 0;
+			padding-bottom: 7px;
+		}
+		#error-page {
+			margin-top: 50px;
+		}
+		#error-page p {
+			font-size: 14px;
+			line-height: 1.5;
+			margin: 25px 0 20px;
+		}
+		#error-page code {
+			font-family: Consolas, Monaco, monospace;
+		}
+		ul li {
+			margin-bottom: 10px;
+			font-size: 14px ;
+		}
+		a {
+			color: #0073aa;
+		}
+		a:hover,
+		a:active {
+			color: #00a0d2;
+		}
+		a:focus {
+			color: #124964;
+		    -webkit-box-shadow:
+		    	0 0 0 1px #5b9dd9,
+				0 0 2px 1px rgba(30, 140, 190, .8);
+		    box-shadow:
+		    	0 0 0 1px #5b9dd9,
+				0 0 2px 1px rgba(30, 140, 190, .8);
+			outline: none;
+		}
+		.button {
+			background: #f7f7f7;
+			border: 1px solid #ccc;
+			color: #555;
+			display: inline-block;
+			text-decoration: none;
+			font-size: 13px;
+			line-height: 26px;
+			height: 28px;
+			margin: 0;
+			padding: 0 10px 1px;
+			cursor: pointer;
+			-webkit-border-radius: 3px;
+			-webkit-appearance: none;
+			border-radius: 3px;
+			white-space: nowrap;
+			-webkit-box-sizing: border-box;
+			-moz-box-sizing:    border-box;
+			box-sizing:         border-box;
+
+			-webkit-box-shadow: 0 1px 0 #ccc;
+			box-shadow: 0 1px 0 #ccc;
+		 	vertical-align: top;
+		}
+
+		.button.button-large {
+			height: 30px;
+			line-height: 28px;
+			padding: 0 12px 2px;
+		}
+
+		.button:hover,
+		.button:focus {
+			background: #fafafa;
+			border-color: #999;
+			color: #23282d;
+		}
+
+		.button:focus  {
+			border-color: #5b9dd9;
+			-webkit-box-shadow: 0 0 3px rgba( 0, 115, 170, .8 );
+			box-shadow: 0 0 3px rgba( 0, 115, 170, .8 );
+			outline: none;
+		}
+
+		.button:active {
+			background: #eee;
+			border-color: #999;
+		 	-webkit-box-shadow: inset 0 2px 5px -3px rgba( 0, 0, 0, 0.5 );
+		 	box-shadow: inset 0 2px 5px -3px rgba( 0, 0, 0, 0.5 );
+		 	-webkit-transform: translateY(1px);
+		 	-ms-transform: translateY(1px);
+		 	transform: translateY(1px);
+		}
+
+		<?php
+		if ( 'rtl' == $text_direction ) {
+			echo 'body { font-family: Tahoma, Arial; }';
+		}
+		?>
+	</style>
+</head>
+<body id="error-page">
+<?php endif; // ! did_action( 'admin_head' ) ?>
+	<?php echo $message; ?>
+</body>
+</html>
+<?php
+	die();
+}
+
+/**
+ * Kill WordPress execution and display XML message with error message.
+ *
+ * This is the handler for wp_die when processing XMLRPC requests.
+ *
+ * @since 3.2.0
+ * @access private
+ *
+ * @global wp_xmlrpc_server $wp_xmlrpc_server
+ *
+ * @param string       $message Error message.
+ * @param string       $title   Optional. Error title. Default empty.
+ * @param string|array $args    Optional. Arguments to control behavior. Default empty array.
+ */
+function _xmlrpc_wp_die_handler( $message, $title = '', $args = array() ) {
+	global $wp_xmlrpc_server;
+	$defaults = array( 'response' => 500 );
+
+	$r = wp_parse_args($args, $defaults);
+
+	if ( $wp_xmlrpc_server ) {
+		$error = new IXR_Error( $r['response'] , $message);
+		$wp_xmlrpc_server->output( $error->getXml() );
+	}
+	die();
+}
+
+/**
+ * Kill WordPress ajax execution.
+ *
+ * This is the handler for wp_die when processing Ajax requests.
+ *
+ * @since 3.4.0
+ * @access private
+ *
+ * @param string $message Optional. Response to print. Default empty.
+ */
+function _ajax_wp_die_handler( $message = '' ) {
+	if ( is_scalar( $message ) )
+		die( (string) $message );
+	die( '0' );
+}
+
+/**
+ * Kill WordPress execution.
+ *
+ * This is the handler for wp_die when processing APP requests.
+ *
+ * @since 3.4.0
+ * @access private
+ *
+ * @param string $message Optional. Response to print. Default empty.
+ */
+function _scalar_wp_die_handler( $message = '' ) {
+	if ( is_scalar( $message ) )
+		die( (string) $message );
+	die();
+}
+
+/**
+ * Encode a variable into JSON, with some sanity checks.
+ *
+ * @since 4.1.0
+ *
+ * @param mixed $data    Variable (usually an array or object) to encode as JSON.
+ * @param int   $options Optional. Options to be passed to json_encode(). Default 0.
+ * @param int   $depth   Optional. Maximum depth to walk through $data. Must be
+ *                       greater than 0. Default 512.
+ * @return string|false The JSON encoded string, or false if it cannot be encoded.
+ */
+function wp_json_encode( $data, $options = 0, $depth = 512 ) {
+	/*
+	 * json_encode() has had extra params added over the years.
+	 * $options was added in 5.3, and $depth in 5.5.
+	 * We need to make sure we call it with the correct arguments.
+	 */
+	if ( version_compare( PHP_VERSION, '5.5', '>=' ) ) {
+		$args = array( $data, $options, $depth );
+	} elseif ( version_compare( PHP_VERSION, '5.3', '>=' ) ) {
+		$args = array( $data, $options );
+	} else {
+		$args = array( $data );
+	}
+
+	// Prepare the data for JSON serialization.
+	$data = _wp_json_prepare_data( $data );
+
+	$json = @call_user_func_array( 'json_encode', $args );
+
+	// If json_encode() was successful, no need to do more sanity checking.
+	// ... unless we're in an old version of PHP, and json_encode() returned
+	// a string containing 'null'. Then we need to do more sanity checking.
+	if ( false !== $json && ( version_compare( PHP_VERSION, '5.5', '>=' ) || false === strpos( $json, 'null' ) ) )  {
+		return $json;
+	}
+
+	try {
+		$args[0] = _wp_json_sanity_check( $data, $depth );
+	} catch ( Exception $e ) {
+		return false;
+	}
+
+	return call_user_func_array( 'json_encode', $args );
+}
+
+/**
+ * Perform sanity checks on data that shall be encoded to JSON.
+ *
+ * @ignore
+ * @since 4.1.0
+ * @access private
+ *
+ * @see wp_json_encode()
+ *
+ * @param mixed $data  Variable (usually an array or object) to encode as JSON.
+ * @param int   $depth Maximum depth to walk through $data. Must be greater than 0.
+ * @return mixed The sanitized data that shall be encoded to JSON.
+ */
+function _wp_json_sanity_check( $data, $depth ) {
+	if ( $depth < 0 ) {
+		throw new Exception( 'Reached depth limit' );
+	}
+
+	if ( is_array( $data ) ) {
+		$output = array();
+		foreach ( $data as $id => $el ) {
+			// Don't forget to sanitize the ID!
+			if ( is_string( $id ) ) {
+				$clean_id = _wp_json_convert_string( $id );
+			} else {
+				$clean_id = $id;
+			}
+
+			// Check the element type, so that we're only recursing if we really have to.
+			if ( is_array( $el ) || is_object( $el ) ) {
+				$output[ $clean_id ] = _wp_json_sanity_check( $el, $depth - 1 );
+			} elseif ( is_string( $el ) ) {
+				$output[ $clean_id ] = _wp_json_convert_string( $el );
+			} else {
+				$output[ $clean_id ] = $el;
+			}
+		}
+	} elseif ( is_object( $data ) ) {
+		$output = new stdClass;
+		foreach ( $data as $id => $el ) {
+			if ( is_string( $id ) ) {
+				$clean_id = _wp_json_convert_string( $id );
+			} else {
+				$clean_id = $id;
+			}
+
+			if ( is_array( $el ) || is_object( $el ) ) {
+				$output->$clean_id = _wp_json_sanity_check( $el, $depth - 1 );
+			} elseif ( is_string( $el ) ) {
+				$output->$clean_id = _wp_json_convert_string( $el );
+			} else {
+				$output->$clean_id = $el;
+			}
+		}
+	} elseif ( is_string( $data ) ) {
+		return _wp_json_convert_string( $data );
+	} else {
+		return $data;
+	}
+
+	return $output;
+}
+
+/**
+ * Convert a string to UTF-8, so that it can be safely encoded to JSON.
+ *
+ * @ignore
+ * @since 4.1.0
+ * @access private
+ *
+ * @see _wp_json_sanity_check()
+ *
+ * @staticvar bool $use_mb
+ *
+ * @param string $string The string which is to be converted.
+ * @return string The checked string.
+ */
+function _wp_json_convert_string( $string ) {
+	static $use_mb = null;
+	if ( is_null( $use_mb ) ) {
+		$use_mb = function_exists( 'mb_convert_encoding' );
+	}
+
+	if ( $use_mb ) {
+		$encoding = mb_detect_encoding( $string, mb_detect_order(), true );
+		if ( $encoding ) {
+			return mb_convert_encoding( $string, 'UTF-8', $encoding );
+		} else {
+			return mb_convert_encoding( $string, 'UTF-8', 'UTF-8' );
+		}
+	} else {
+		return wp_check_invalid_utf8( $string, true );
+	}
+}
+
+/**
+ * Prepares response data to be serialized to JSON.
+ *
+ * This supports the JsonSerializable interface for PHP 5.2-5.3 as well.
+ *
+ * @ignore
+ * @since 4.4.0
+ * @access private
+ *
+ * @param mixed $data Native representation.
+ * @return bool|int|float|null|string|array Data ready for `json_encode()`.
+ */
+function _wp_json_prepare_data( $data ) {
+	if ( ! defined( 'WP_JSON_SERIALIZE_COMPATIBLE' ) || WP_JSON_SERIALIZE_COMPATIBLE === false ) {
+		return $data;
+	}
+
+	switch ( gettype( $data ) ) {
+		case 'boolean':
+		case 'integer':
+		case 'double':
+		case 'string':
+		case 'NULL':
+			// These values can be passed through.
+			return $data;
+
+		case 'array':
+			// Arrays must be mapped in case they also return objects.
+			return array_map( '_wp_json_prepare_data', $data );
+
+		case 'object':
+			// If this is an incomplete object (__PHP_Incomplete_Class), bail.
+			if ( ! is_object( $data ) ) {
+				return null;
+			}
+
+			if ( $data instanceof JsonSerializable ) {
+				$data = $data->jsonSerialize();
+			} else {
+				$data = get_object_vars( $data );
+			}
+
+			// Now, pass the array (or whatever was returned from jsonSerialize through).
+			return _wp_json_prepare_data( $data );
+
+		default:
+			return null;
+	}
+}
+
+/**
+ * Send a JSON response back to an Ajax request.
+ *
+ * @since 3.5.0
+ *
+ * @param mixed $response Variable (usually an array or object) to encode as JSON,
+ *                        then print and die.
+ */
+function wp_send_json( $response ) {
+	@header( 'Content-Type: application/json; charset=' . get_option( 'blog_charset' ) );
+	echo wp_json_encode( $response );
+	if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
+		wp_die();
+	else
+		die;
+}
+
+/**
+ * Send a JSON response back to an Ajax request, indicating success.
+ *
+ * @since 3.5.0
+ *
+ * @param mixed $data Data to encode as JSON, then print and die.
+ */
+function wp_send_json_success( $data = null ) {
+	$response = array( 'success' => true );
+
+	if ( isset( $data ) )
+		$response['data'] = $data;
+
+	wp_send_json( $response );
+}
+
+/**
+ * Send a JSON response back to an Ajax request, indicating failure.
+ *
+ * If the `$data` parameter is a {@see WP_Error} object, the errors
+ * within the object are processed and output as an array of error
+ * codes and corresponding messages. All other types are output
+ * without further processing.
+ *
+ * @since 3.5.0
+ * @since 4.1.0 The `$data` parameter is now processed if a {@see WP_Error}
+ *              object is passed in.
+ *
+ * @param mixed $data Data to encode as JSON, then print and die.
+ */
+function wp_send_json_error( $data = null ) {
+	$response = array( 'success' => false );
+
+	if ( isset( $data ) ) {
+		if ( is_wp_error( $data ) ) {
+			$result = array();
+			foreach ( $data->errors as $code => $messages ) {
+				foreach ( $messages as $message ) {
+					$result[] = array( 'code' => $code, 'message' => $message );
+				}
+			}
+
+			$response['data'] = $result;
+		} else {
+			$response['data'] = $data;
+		}
+	}
+
+	wp_send_json( $response );
+}
+
+/**
+ * Retrieve the WordPress home page URL.
+ *
+ * If the constant named 'WP_HOME' exists, then it will be used and returned
+ * by the function. This can be used to counter the redirection on your local
+ * development environment.
+ *
+ * @since 2.2.0
+ * @access private
+ *
+ * @see WP_HOME
+ *
+ * @param string $url URL for the home location.
+ * @return string Homepage location.
+ */
+function _config_wp_home( $url = '' ) {
+	if ( defined( 'WP_HOME' ) )
+		return untrailingslashit( WP_HOME );
+	return $url;
+}
+
+/**
+ * Retrieve the WordPress site URL.
+ *
+ * If the constant named 'WP_SITEURL' is defined, then the value in that
+ * constant will always be returned. This can be used for debugging a site
+ * on your localhost while not having to change the database to your URL.
+ *
+ * @since 2.2.0
+ * @access private
+ *
+ * @see WP_SITEURL
+ *
+ * @param string $url URL to set the WordPress site location.
+ * @return string The WordPress Site URL.
+ */
+function _config_wp_siteurl( $url = '' ) {
+	if ( defined( 'WP_SITEURL' ) )
+		return untrailingslashit( WP_SITEURL );
+	return $url;
+}
+
+/**
+ * Set the localized direction for MCE plugin.
+ *
+ * Will only set the direction to 'rtl', if the WordPress locale has
+ * the text direction set to 'rtl'.
+ *
+ * Fills in the 'directionality' setting, enables the 'directionality'
+ * plugin, and adds the 'ltr' button to 'toolbar1', formerly
+ * 'theme_advanced_buttons1' array keys. These keys are then returned
+ * in the $input (TinyMCE settings) array.
+ *
+ * @since 2.1.0
+ * @access private
+ *
+ * @param array $input MCE settings array.
+ * @return array Direction set for 'rtl', if needed by locale.
+ */
+function _mce_set_direction( $input ) {
+	if ( is_rtl() ) {
+		$input['directionality'] = 'rtl';
+
+		if ( ! empty( $input['plugins'] ) && strpos( $input['plugins'], 'directionality' ) === false ) {
+			$input['plugins'] .= ',directionality';
+		}
+
+		if ( ! empty( $input['toolbar1'] ) && ! preg_match( '/\bltr\b/', $input['toolbar1'] ) ) {
+			$input['toolbar1'] .= ',ltr';
+		}
+	}
+
+	return $input;
+}
+
+
+/**
+ * Convert smiley code to the icon graphic file equivalent.
+ *
+ * You can turn off smilies, by going to the write setting screen and unchecking
+ * the box, or by setting 'use_smilies' option to false or removing the option.
+ *
+ * Plugins may override the default smiley list by setting the $wpsmiliestrans
+ * to an array, with the key the code the blogger types in and the value the
+ * image file.
+ *
+ * The $wp_smiliessearch global is for the regular expression and is set each
+ * time the function is called.
+ *
+ * The full list of smilies can be found in the function and won't be listed in
+ * the description. Probably should create a Codex page for it, so that it is
+ * available.
+ *
+ * @global array $wpsmiliestrans
+ * @global array $wp_smiliessearch
+ *
+ * @since 2.2.0
+ */
+function smilies_init() {
+	global $wpsmiliestrans, $wp_smiliessearch;
+
+	// don't bother setting up smilies if they are disabled
+	if ( !get_option( 'use_smilies' ) )
+		return;
+
+	if ( !isset( $wpsmiliestrans ) ) {
+		$wpsmiliestrans = array(
+		':mrgreen:' => 'mrgreen.png',
+		':neutral:' => "\xf0\x9f\x98\x90",
+		':twisted:' => "\xf0\x9f\x98\x88",
+		  ':arrow:' => "\xe2\x9e\xa1",
+		  ':shock:' => "\xf0\x9f\x98\xaf",
+		  ':smile:' => "\xf0\x9f\x99\x82",
+		    ':???:' => "\xf0\x9f\x98\x95",
+		   ':cool:' => "\xf0\x9f\x98\x8e",
+		   ':evil:' => "\xf0\x9f\x91\xbf",
+		   ':grin:' => "\xf0\x9f\x98\x80",
+		   ':idea:' => "\xf0\x9f\x92\xa1",
+		   ':oops:' => "\xf0\x9f\x98\xb3",
+		   ':razz:' => "\xf0\x9f\x98\x9b",
+		   ':roll:' => 'rolleyes.png',
+		   ':wink:' => "\xf0\x9f\x98\x89",
+		    ':cry:' => "\xf0\x9f\x98\xa5",
+		    ':eek:' => "\xf0\x9f\x98\xae",
+		    ':lol:' => "\xf0\x9f\x98\x86",
+		    ':mad:' => "\xf0\x9f\x98\xa1",
+		    ':sad:' => "\xf0\x9f\x99\x81",
+		      '8-)' => "\xf0\x9f\x98\x8e",
+		      '8-O' => "\xf0\x9f\x98\xaf",
+		      ':-(' => "\xf0\x9f\x99\x81",
+		      ':-)' => "\xf0\x9f\x99\x82",
+		      ':-?' => "\xf0\x9f\x98\x95",
+		      ':-D' => "\xf0\x9f\x98\x80",
+		      ':-P' => "\xf0\x9f\x98\x9b",
+		      ':-o' => "\xf0\x9f\x98\xae",
+		      ':-x' => "\xf0\x9f\x98\xa1",
+		      ':-|' => "\xf0\x9f\x98\x90",
+		      ';-)' => "\xf0\x9f\x98\x89",
+		// This one transformation breaks regular text with frequency.
+		//     '8)' => "\xf0\x9f\x98\x8e",
+		       '8O' => "\xf0\x9f\x98\xaf",
+		       ':(' => "\xf0\x9f\x99\x81",
+		       ':)' => "\xf0\x9f\x99\x82",
+		       ':?' => "\xf0\x9f\x98\x95",
+		       ':D' => "\xf0\x9f\x98\x80",
+		       ':P' => "\xf0\x9f\x98\x9b",
+		       ':o' => "\xf0\x9f\x98\xae",
+		       ':x' => "\xf0\x9f\x98\xa1",
+		       ':|' => "\xf0\x9f\x98\x90",
+		       ';)' => "\xf0\x9f\x98\x89",
+		      ':!:' => "\xe2\x9d\x97",
+		      ':?:' => "\xe2\x9d\x93",
+		);
+	}
+
+	if (count($wpsmiliestrans) == 0) {
+		return;
+	}
+
+	/*
+	 * NOTE: we sort the smilies in reverse key order. This is to make sure
+	 * we match the longest possible smilie (:???: vs :?) as the regular
+	 * expression used below is first-match
+	 */
+	krsort($wpsmiliestrans);
+
+	$spaces = wp_spaces_regexp();
+
+	// Begin first "subpattern"
+	$wp_smiliessearch = '/(?<=' . $spaces . '|^)';
+
+	$subchar = '';
+	foreach ( (array) $wpsmiliestrans as $smiley => $img ) {
+		$firstchar = substr($smiley, 0, 1);
+		$rest = substr($smiley, 1);
+
+		// new subpattern?
+		if ($firstchar != $subchar) {
+			if ($subchar != '') {
+				$wp_smiliessearch .= ')(?=' . $spaces . '|$)';  // End previous "subpattern"
+				$wp_smiliessearch .= '|(?<=' . $spaces . '|^)'; // Begin another "subpattern"
+			}
+			$subchar = $firstchar;
+			$wp_smiliessearch .= preg_quote($firstchar, '/') . '(?:';
+		} else {
+			$wp_smiliessearch .= '|';
+		}
+		$wp_smiliessearch .= preg_quote($rest, '/');
+	}
+
+	$wp_smiliessearch .= ')(?=' . $spaces . '|$)/m';
+
+}
+
+/**
+ * Merge user defined arguments into defaults array.
+ *
+ * This function is used throughout WordPress to allow for both string or array
+ * to be merged into another array.
+ *
+ * @since 2.2.0
+ *
+ * @param string|array $args     Value to merge with $defaults
+ * @param array        $defaults Optional. Array that serves as the defaults. Default empty.
+ * @return array Merged user defined values with defaults.
+ */
+function wp_parse_args( $args, $defaults = '' ) {
+	if ( is_object( $args ) )
+		$r = get_object_vars( $args );
+	elseif ( is_array( $args ) )
+		$r =& $args;
+	else
+		wp_parse_str( $args, $r );
+
+	if ( is_array( $defaults ) )
+		return array_merge( $defaults, $r );
+	return $r;
+}
+
+/**
+ * Clean up an array, comma- or space-separated list of IDs.
+ *
+ * @since 3.0.0
+ *
+ * @param array|string $list List of ids.
+ * @return array Sanitized array of IDs.
+ */
+function wp_parse_id_list( $list ) {
+	if ( !is_array($list) )
+		$list = preg_split('/[\s,]+/', $list);
+
+	return array_unique(array_map('absint', $list));
+}
+
+/**
+ * Extract a slice of an array, given a list of keys.
+ *
+ * @since 3.1.0
+ *
+ * @param array $array The original array.
+ * @param array $keys  The list of keys.
+ * @return array The array slice.
+ */
+function wp_array_slice_assoc( $array, $keys ) {
+	$slice = array();
+	foreach ( $keys as $key )
+		if ( isset( $array[ $key ] ) )
+			$slice[ $key ] = $array[ $key ];
+
+	return $slice;
+}
+
+/**
+ * Determines if the variable is a numeric-indexed array.
+ *
+ * @since 4.4.0
+ *
+ * @param mixed $data Variable to check.
+ * @return bool Whether the variable is a list.
+ */
+function wp_is_numeric_array( $data ) {
+	if ( ! is_array( $data ) ) {
+		return false;
+	}
+
+	$keys = array_keys( $data );
+	$string_keys = array_filter( $keys, 'is_string' );
+	return count( $string_keys ) === 0;
+}
+
+/**
+ * Filters a list of objects, based on a set of key => value arguments.
+ *
+ * @since 3.0.0
+ *
+ * @param array       $list     An array of objects to filter
+ * @param array       $args     Optional. An array of key => value arguments to match
+ *                              against each object. Default empty array.
+ * @param string      $operator Optional. The logical operation to perform. 'or' means
+ *                              only one element from the array needs to match; 'and'
+ *                              means all elements must match; 'not' means no elements may
+ *                              match. Default 'and'.
+ * @param bool|string $field    A field from the object to place instead of the entire object.
+ *                              Default false.
+ * @return array A list of objects or object fields.
+ */
+function wp_filter_object_list( $list, $args = array(), $operator = 'and', $field = false ) {
+	if ( ! is_array( $list ) )
+		return array();
+
+	$list = wp_list_filter( $list, $args, $operator );
+
+	if ( $field )
+		$list = wp_list_pluck( $list, $field );
+
+	return $list;
+}
+
+/**
+ * Filters a list of objects, based on a set of key => value arguments.
+ *
+ * @since 3.1.0
+ *
+ * @param array  $list     An array of objects to filter.
+ * @param array  $args     Optional. An array of key => value arguments to match
+ *                         against each object. Default empty array.
+ * @param string $operator Optional. The logical operation to perform. 'AND' means
+ *                         all elements from the array must match. 'OR' means only
+ *                         one element needs to match. 'NOT' means no elements may
+ *                         match. Default 'AND'.
+ * @return array Array of found values.
+ */
+function wp_list_filter( $list, $args = array(), $operator = 'AND' ) {
+	if ( ! is_array( $list ) )
+		return array();
+
+	if ( empty( $args ) )
+		return $list;
+
+	$operator = strtoupper( $operator );
+	$count = count( $args );
+	$filtered = array();
+
+	foreach ( $list as $key => $obj ) {
+		$to_match = (array) $obj;
+
+		$matched = 0;
+		foreach ( $args as $m_key => $m_value ) {
+			if ( array_key_exists( $m_key, $to_match ) && $m_value == $to_match[ $m_key ] )
+				$matched++;
+		}
+
+		if ( ( 'AND' == $operator && $matched == $count )
+		  || ( 'OR' == $operator && $matched > 0 )
+		  || ( 'NOT' == $operator && 0 == $matched ) ) {
+			$filtered[$key] = $obj;
+		}
+	}
+
+	return $filtered;
+}
+
+/**
+ * Pluck a certain field out of each object in a list.
+ *
+ * This has the same functionality and prototype of
+ * array_column() (PHP 5.5) but also supports objects.
+ *
+ * @since 3.1.0
+ * @since 4.0.0 $index_key parameter added.
+ *
+ * @param array      $list      List of objects or arrays
+ * @param int|string $field     Field from the object to place instead of the entire object
+ * @param int|string $index_key Optional. Field from the object to use as keys for the new array.
+ *                              Default null.
+ * @return array Array of found values. If `$index_key` is set, an array of found values with keys
+ *               corresponding to `$index_key`. If `$index_key` is null, array keys from the original
+ *               `$list` will be preserved in the results.
+ */
+function wp_list_pluck( $list, $field, $index_key = null ) {
+	if ( ! $index_key ) {
+		/*
+		 * This is simple. Could at some point wrap array_column()
+		 * if we knew we had an array of arrays.
+		 */
+		foreach ( $list as $key => $value ) {
+			if ( is_object( $value ) ) {
+				$list[ $key ] = $value->$field;
+			} else {
+				$list[ $key ] = $value[ $field ];
+			}
+		}
+		return $list;
+	}
+
+	/*
+	 * When index_key is not set for a particular item, push the value
+	 * to the end of the stack. This is how array_column() behaves.
+	 */
+	$newlist = array();
+	foreach ( $list as $value ) {
+		if ( is_object( $value ) ) {
+			if ( isset( $value->$index_key ) ) {
+				$newlist[ $value->$index_key ] = $value->$field;
+			} else {
+				$newlist[] = $value->$field;
+			}
+		} else {
+			if ( isset( $value[ $index_key ] ) ) {
+				$newlist[ $value[ $index_key ] ] = $value[ $field ];
+			} else {
+				$newlist[] = $value[ $field ];
+			}
+		}
+	}
+
+	return $newlist;
+}
+
+/**
+ * Determines if Widgets library should be loaded.
+ *
+ * Checks to make sure that the widgets library hasn't already been loaded.
+ * If it hasn't, then it will load the widgets library and run an action hook.
+ *
+ * @since 2.2.0
+ */
+function wp_maybe_load_widgets() {
+	/**
+	 * Filter whether to load the Widgets library.
+	 *
+	 * Passing a falsey value to the filter will effectively short-circuit
+	 * the Widgets library from loading.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param bool $wp_maybe_load_widgets Whether to load the Widgets library.
+	 *                                    Default true.
+	 */
+	if ( ! apply_filters( 'load_default_widgets', true ) ) {
+		return;
+	}
+
+	require_once( ABSPATH . WPINC . '/default-widgets.php' );
+
+	add_action( '_admin_menu', 'wp_widgets_add_menu' );
+}
+
+/**
+ * Append the Widgets menu to the themes main menu.
+ *
+ * @since 2.2.0
+ *
+ * @global array $submenu
+ */
+function wp_widgets_add_menu() {
+	global $submenu;
+
+	if ( ! current_theme_supports( 'widgets' ) )
+		return;
+
+	$submenu['themes.php'][7] = array( __( 'Widgets' ), 'edit_theme_options', 'widgets.php' );
+	ksort( $submenu['themes.php'], SORT_NUMERIC );
+}
+
+/**
+ * Flush all output buffers for PHP 5.2.
+ *
+ * Make sure all output buffers are flushed before our singletons are destroyed.
+ *
+ * @since 2.2.0
+ */
+function wp_ob_end_flush_all() {
+	$levels = ob_get_level();
+	for ($i=0; $i<$levels; $i++)
+		ob_end_flush();
+}
+
+/**
+ * Load custom DB error or display WordPress DB error.
+ *
+ * If a file exists in the wp-content directory named db-error.php, then it will
+ * be loaded instead of displaying the WordPress DB error. If it is not found,
+ * then the WordPress DB error will be displayed instead.
+ *
+ * The WordPress DB error sets the HTTP status header to 500 to try to prevent
+ * search engines from caching the message. Custom DB messages should do the
+ * same.
+ *
+ * This function was backported to WordPress 2.3.2, but originally was added
+ * in WordPress 2.5.0.
+ *
+ * @since 2.3.2
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ */
+function dead_db() {
+	global $wpdb;
+
+	wp_load_translations_early();
+
+	// Load custom DB error template, if present.
+	if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) {
+		require_once( WP_CONTENT_DIR . '/db-error.php' );
+		die();
+	}
+
+	// If installing or in the admin, provide the verbose message.
+	if ( wp_installing() || defined( 'WP_ADMIN' ) )
+		wp_die($wpdb->error);
+
+	// Otherwise, be terse.
+	status_header( 500 );
+	nocache_headers();
+	header( 'Content-Type: text/html; charset=utf-8' );
+?>
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml"<?php if ( is_rtl() ) echo ' dir="rtl"'; ?>>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+	<title><?php _e( 'Database Error' ); ?></title>
+
+</head>
+<body>
+	<h1><?php _e( 'Error establishing a database connection' ); ?></h1>
+</body>
+</html>
+<?php
+	die();
+}
+
+/**
+ * Convert a value to non-negative integer.
+ *
+ * @since 2.5.0
+ *
+ * @param mixed $maybeint Data you wish to have converted to a non-negative integer.
+ * @return int A non-negative integer.
+ */
+function absint( $maybeint ) {
+	return abs( intval( $maybeint ) );
+}
+
+/**
+ * Mark a function as deprecated and inform when it has been used.
+ *
+ * There is a hook deprecated_function_run that will be called that can be used
+ * to get the backtrace up to what file and function called the deprecated
+ * function.
+ *
+ * The current behavior is to trigger a user error if WP_DEBUG is true.
+ *
+ * This function is to be used in every function that is deprecated.
+ *
+ * @since 2.5.0
+ * @access private
+ *
+ * @param string $function    The function that was called.
+ * @param string $version     The version of WordPress that deprecated the function.
+ * @param string $replacement Optional. The function that should have been called. Default null.
+ */
+function _deprecated_function( $function, $version, $replacement = null ) {
+
+	/**
+	 * Fires when a deprecated function is called.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param string $function    The function that was called.
+	 * @param string $replacement The function that should have been called.
+	 * @param string $version     The version of WordPress that deprecated the function.
+	 */
+	do_action( 'deprecated_function_run', $function, $replacement, $version );
+
+	/**
+	 * Filter whether to trigger an error for deprecated functions.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
+	 */
+	if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) {
+		if ( function_exists( '__' ) ) {
+			if ( ! is_null( $replacement ) )
+				trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) );
+			else
+				trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
+		} else {
+			if ( ! is_null( $replacement ) )
+				trigger_error( sprintf( '%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.', $function, $version, $replacement ) );
+			else
+				trigger_error( sprintf( '%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.', $function, $version ) );
+		}
+	}
+}
+
+/**
+ * Marks a constructor as deprecated and informs when it has been used.
+ *
+ * Similar to _deprecated_function(), but with different strings. Used to
+ * remove PHP4 style constructors.
+ *
+ * The current behavior is to trigger a user error if `WP_DEBUG` is true.
+ *
+ * This function is to be used in every PHP4 style constructor method that is deprecated.
+ *
+ * @since 4.3.0
+ * @since 4.5.0 Added the `$parent_class` parameter.
+ *
+ * @access private
+ *
+ * @param string $class        The class containing the deprecated constructor.
+ * @param string $version      The version of WordPress that deprecated the function.
+ * @param string $parent_class Optional. The parent class calling the deprecated constructor.
+ *                             Default empty string.
+ */
+function _deprecated_constructor( $class, $version, $parent_class = '' ) {
+
+	/**
+	 * Fires when a deprecated constructor is called.
+	 *
+	 * @since 4.3.0
+	 * @since 4.5.0 Added the `$parent_class` parameter.
+	 *
+	 * @param string $class        The class containing the deprecated constructor.
+	 * @param string $version      The version of WordPress that deprecated the function.
+	 * @param string $parent_class The parent class calling the deprecated constructor.
+	 */
+	do_action( 'deprecated_constructor_run', $class, $version, $parent_class );
+
+	/**
+	 * Filter whether to trigger an error for deprecated functions.
+	 *
+	 * `WP_DEBUG` must be true in addition to the filter evaluating to true.
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
+	 */
+	if ( WP_DEBUG && apply_filters( 'deprecated_constructor_trigger_error', true ) ) {
+		if ( function_exists( '__' ) ) {
+			if ( ! empty( $parent_class ) ) {
+				/* translators: 1: PHP class name, 2: PHP parent class name, 3: version number, 4: __construct() method */
+				trigger_error( sprintf( __( 'The called constructor method for %1$s in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.' ),
+					$class, $parent_class, $version, '<pre>__construct()</pre>' ) );
+			} else {
+				/* translators: 1: PHP class name, 2: version number, 3: __construct() method */
+				trigger_error( sprintf( __( 'The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ),
+					$class, $version, '<pre>__construct()</pre>' ) );
+			}
+		} else {
+			if ( ! empty( $parent_class ) ) {
+				trigger_error( sprintf( 'The called constructor method for %1$s in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.',
+					$class, $parent_class, $version, '<pre>__construct()</pre>' ) );
+			} else {
+				trigger_error( sprintf( 'The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.',
+					$class, $version, '<pre>__construct()</pre>' ) );
+			}
+		}
+	}
+
+}
+
+/**
+ * Mark a file as deprecated and inform when it has been used.
+ *
+ * There is a hook deprecated_file_included that will be called that can be used
+ * to get the backtrace up to what file and function included the deprecated
+ * file.
+ *
+ * The current behavior is to trigger a user error if WP_DEBUG is true.
+ *
+ * This function is to be used in every file that is deprecated.
+ *
+ * @since 2.5.0
+ * @access private
+ *
+ * @param string $file        The file that was included.
+ * @param string $version     The version of WordPress that deprecated the file.
+ * @param string $replacement Optional. The file that should have been included based on ABSPATH.
+ *                            Default null.
+ * @param string $message     Optional. A message regarding the change. Default empty.
+ */
+function _deprecated_file( $file, $version, $replacement = null, $message = '' ) {
+
+	/**
+	 * Fires when a deprecated file is called.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param string $file        The file that was called.
+	 * @param string $replacement The file that should have been included based on ABSPATH.
+	 * @param string $version     The version of WordPress that deprecated the file.
+	 * @param string $message     A message regarding the change.
+	 */
+	do_action( 'deprecated_file_included', $file, $replacement, $version, $message );
+
+	/**
+	 * Filter whether to trigger an error for deprecated files.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param bool $trigger Whether to trigger the error for deprecated files. Default true.
+	 */
+	if ( WP_DEBUG && apply_filters( 'deprecated_file_trigger_error', true ) ) {
+		$message = empty( $message ) ? '' : ' ' . $message;
+		if ( function_exists( '__' ) ) {
+			if ( ! is_null( $replacement ) )
+				trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $file, $version, $replacement ) . $message );
+			else
+				trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $file, $version ) . $message );
+		} else {
+			if ( ! is_null( $replacement ) )
+				trigger_error( sprintf( '%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.', $file, $version, $replacement ) . $message );
+			else
+				trigger_error( sprintf( '%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.', $file, $version ) . $message );
+		}
+	}
+}
+/**
+ * Mark a function argument as deprecated and inform when it has been used.
+ *
+ * This function is to be used whenever a deprecated function argument is used.
+ * Before this function is called, the argument must be checked for whether it was
+ * used by comparing it to its default value or evaluating whether it is empty.
+ * For example:
+ *
+ *     if ( ! empty( $deprecated ) ) {
+ *         _deprecated_argument( __FUNCTION__, '3.0' );
+ *     }
+ *
+ *
+ * There is a hook deprecated_argument_run that will be called that can be used
+ * to get the backtrace up to what file and function used the deprecated
+ * argument.
+ *
+ * The current behavior is to trigger a user error if WP_DEBUG is true.
+ *
+ * @since 3.0.0
+ * @access private
+ *
+ * @param string $function The function that was called.
+ * @param string $version  The version of WordPress that deprecated the argument used.
+ * @param string $message  Optional. A message regarding the change. Default null.
+ */
+function _deprecated_argument( $function, $version, $message = null ) {
+
+	/**
+	 * Fires when a deprecated argument is called.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param string $function The function that was called.
+	 * @param string $message  A message regarding the change.
+	 * @param string $version  The version of WordPress that deprecated the argument used.
+	 */
+	do_action( 'deprecated_argument_run', $function, $message, $version );
+
+	/**
+	 * Filter whether to trigger an error for deprecated arguments.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param bool $trigger Whether to trigger the error for deprecated arguments. Default true.
+	 */
+	if ( WP_DEBUG && apply_filters( 'deprecated_argument_trigger_error', true ) ) {
+		if ( function_exists( '__' ) ) {
+			if ( ! is_null( $message ) )
+				trigger_error( sprintf( __('%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s'), $function, $version, $message ) );
+			else
+				trigger_error( sprintf( __('%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
+		} else {
+			if ( ! is_null( $message ) )
+				trigger_error( sprintf( '%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s', $function, $version, $message ) );
+			else
+				trigger_error( sprintf( '%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s with no alternative available.', $function, $version ) );
+		}
+	}
+}
+
+/**
+ * Mark something as being incorrectly called.
+ *
+ * There is a hook doing_it_wrong_run that will be called that can be used
+ * to get the backtrace up to what file and function called the deprecated
+ * function.
+ *
+ * The current behavior is to trigger a user error if WP_DEBUG is true.
+ *
+ * @since 3.1.0
+ * @access private
+ *
+ * @param string $function The function that was called.
+ * @param string $message  A message explaining what has been done incorrectly.
+ * @param string $version  The version of WordPress where the message was added.
+ */
+function _doing_it_wrong( $function, $message, $version ) {
+
+	/**
+	 * Fires when the given function is being used incorrectly.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param string $function The function that was called.
+	 * @param string $message  A message explaining what has been done incorrectly.
+	 * @param string $version  The version of WordPress where the message was added.
+	 */
+	do_action( 'doing_it_wrong_run', $function, $message, $version );
+
+	/**
+	 * Filter whether to trigger an error for _doing_it_wrong() calls.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param bool $trigger Whether to trigger the error for _doing_it_wrong() calls. Default true.
+	 */
+	if ( WP_DEBUG && apply_filters( 'doing_it_wrong_trigger_error', true ) ) {
+		if ( function_exists( '__' ) ) {
+			$version = is_null( $version ) ? '' : sprintf( __( '(This message was added in version %s.)' ), $version );
+			/* translators: %s: Codex URL */
+			$message .= ' ' . sprintf( __( 'Please see <a href="%s">Debugging in WordPress</a> for more information.' ),
+				__( 'https://codex.wordpress.org/Debugging_in_WordPress' )
+			);
+			trigger_error( sprintf( __( '%1$s was called <strong>incorrectly</strong>. %2$s %3$s' ), $function, $message, $version ) );
+		} else {
+			$version = is_null( $version ) ? '' : sprintf( '(This message was added in version %s.)', $version );
+			$message .= sprintf( ' Please see <a href="%s">Debugging in WordPress</a> for more information.',
+				'https://codex.wordpress.org/Debugging_in_WordPress'
+			);
+			trigger_error( sprintf( '%1$s was called <strong>incorrectly</strong>. %2$s %3$s', $function, $message, $version ) );
+		}
+	}
+}
+
+/**
+ * Is the server running earlier than 1.5.0 version of lighttpd?
+ *
+ * @since 2.5.0
+ *
+ * @return bool Whether the server is running lighttpd < 1.5.0.
+ */
+function is_lighttpd_before_150() {
+	$server_parts = explode( '/', isset( $_SERVER['SERVER_SOFTWARE'] )? $_SERVER['SERVER_SOFTWARE'] : '' );
+	$server_parts[1] = isset( $server_parts[1] )? $server_parts[1] : '';
+	return  'lighttpd' == $server_parts[0] && -1 == version_compare( $server_parts[1], '1.5.0' );
+}
+
+/**
+ * Does the specified module exist in the Apache config?
+ *
+ * @since 2.5.0
+ *
+ * @global bool $is_apache
+ *
+ * @param string $mod     The module, e.g. mod_rewrite.
+ * @param bool   $default Optional. The default return value if the module is not found. Default false.
+ * @return bool Whether the specified module is loaded.
+ */
+function apache_mod_loaded($mod, $default = false) {
+	global $is_apache;
+
+	if ( !$is_apache )
+		return false;
+
+	if ( function_exists( 'apache_get_modules' ) ) {
+		$mods = apache_get_modules();
+		if ( in_array($mod, $mods) )
+			return true;
+	} elseif ( function_exists( 'phpinfo' ) && false === strpos( ini_get( 'disable_functions' ), 'phpinfo' ) ) {
+			ob_start();
+			phpinfo(8);
+			$phpinfo = ob_get_clean();
+			if ( false !== strpos($phpinfo, $mod) )
+				return true;
+	}
+	return $default;
+}
+
+/**
+ * Check if IIS 7+ supports pretty permalinks.
+ *
+ * @since 2.8.0
+ *
+ * @global bool $is_iis7
+ *
+ * @return bool Whether IIS7 supports permalinks.
+ */
+function iis7_supports_permalinks() {
+	global $is_iis7;
+
+	$supports_permalinks = false;
+	if ( $is_iis7 ) {
+		/* First we check if the DOMDocument class exists. If it does not exist, then we cannot
+		 * easily update the xml configuration file, hence we just bail out and tell user that
+		 * pretty permalinks cannot be used.
+		 *
+		 * Next we check if the URL Rewrite Module 1.1 is loaded and enabled for the web site. When
+		 * URL Rewrite 1.1 is loaded it always sets a server variable called 'IIS_UrlRewriteModule'.
+		 * Lastly we make sure that PHP is running via FastCGI. This is important because if it runs
+		 * via ISAPI then pretty permalinks will not work.
+		 */
+		$supports_permalinks = class_exists( 'DOMDocument', false ) && isset($_SERVER['IIS_UrlRewriteModule']) && ( PHP_SAPI == 'cgi-fcgi' );
+	}
+
+	/**
+	 * Filter whether IIS 7+ supports pretty permalinks.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param bool $supports_permalinks Whether IIS7 supports permalinks. Default false.
+	 */
+	return apply_filters( 'iis7_supports_permalinks', $supports_permalinks );
+}
+
+/**
+ * File validates against allowed set of defined rules.
+ *
+ * A return value of '1' means that the $file contains either '..' or './'. A
+ * return value of '2' means that the $file contains ':' after the first
+ * character. A return value of '3' means that the file is not in the allowed
+ * files list.
+ *
+ * @since 1.2.0
+ *
+ * @param string $file File path.
+ * @param array  $allowed_files List of allowed files.
+ * @return int 0 means nothing is wrong, greater than 0 means something was wrong.
+ */
+function validate_file( $file, $allowed_files = '' ) {
+	if ( false !== strpos( $file, '..' ) )
+		return 1;
+
+	if ( false !== strpos( $file, './' ) )
+		return 1;
+
+	if ( ! empty( $allowed_files ) && ! in_array( $file, $allowed_files ) )
+		return 3;
+
+	if (':' == substr( $file, 1, 1 ) )
+		return 2;
+
+	return 0;
+}
+
+/**
+ * Determine if SSL is used.
+ *
+ * @since 2.6.0
+ *
+ * @return bool True if SSL, false if not used.
+ */
+function is_ssl() {
+	if ( isset($_SERVER['HTTPS']) ) {
+		if ( 'on' == strtolower($_SERVER['HTTPS']) )
+			return true;
+		if ( '1' == $_SERVER['HTTPS'] )
+			return true;
+	} elseif ( isset($_SERVER['SERVER_PORT']) && ( '443' == $_SERVER['SERVER_PORT'] ) ) {
+		return true;
+	}
+	return false;
+}
+
+/**
+ * Whether to force SSL used for the Administration Screens.
+ *
+ * @since 2.6.0
+ *
+ * @staticvar bool $forced
+ *
+ * @param string|bool $force Optional. Whether to force SSL in admin screens. Default null.
+ * @return bool True if forced, false if not forced.
+ */
+function force_ssl_admin( $force = null ) {
+	static $forced = false;
+
+	if ( !is_null( $force ) ) {
+		$old_forced = $forced;
+		$forced = $force;
+		return $old_forced;
+	}
+
+	return $forced;
+}
+
+/**
+ * Guess the URL for the site.
+ *
+ * Will remove wp-admin links to retrieve only return URLs not in the wp-admin
+ * directory.
+ *
+ * @since 2.6.0
+ *
+ * @return string The guessed URL.
+ */
+function wp_guess_url() {
+	if ( defined('WP_SITEURL') && '' != WP_SITEURL ) {
+		$url = WP_SITEURL;
+	} else {
+		$abspath_fix = str_replace( '\\', '/', ABSPATH );
+		$script_filename_dir = dirname( $_SERVER['SCRIPT_FILENAME'] );
+
+		// The request is for the admin
+		if ( strpos( $_SERVER['REQUEST_URI'], 'wp-admin' ) !== false || strpos( $_SERVER['REQUEST_URI'], 'wp-login.php' ) !== false ) {
+			$path = preg_replace( '#/(wp-admin/.*|wp-login.php)#i', '', $_SERVER['REQUEST_URI'] );
+
+		// The request is for a file in ABSPATH
+		} elseif ( $script_filename_dir . '/' == $abspath_fix ) {
+			// Strip off any file/query params in the path
+			$path = preg_replace( '#/[^/]*$#i', '', $_SERVER['PHP_SELF'] );
+
+		} else {
+			if ( false !== strpos( $_SERVER['SCRIPT_FILENAME'], $abspath_fix ) ) {
+				// Request is hitting a file inside ABSPATH
+				$directory = str_replace( ABSPATH, '', $script_filename_dir );
+				// Strip off the sub directory, and any file/query params
+				$path = preg_replace( '#/' . preg_quote( $directory, '#' ) . '/[^/]*$#i', '' , $_SERVER['REQUEST_URI'] );
+			} elseif ( false !== strpos( $abspath_fix, $script_filename_dir ) ) {
+				// Request is hitting a file above ABSPATH
+				$subdirectory = substr( $abspath_fix, strpos( $abspath_fix, $script_filename_dir ) + strlen( $script_filename_dir ) );
+				// Strip off any file/query params from the path, appending the sub directory to the install
+				$path = preg_replace( '#/[^/]*$#i', '' , $_SERVER['REQUEST_URI'] ) . $subdirectory;
+			} else {
+				$path = $_SERVER['REQUEST_URI'];
+			}
+		}
+
+		$schema = is_ssl() ? 'https://' : 'http://'; // set_url_scheme() is not defined yet
+		$url = $schema . $_SERVER['HTTP_HOST'] . $path;
+	}
+
+	return rtrim($url, '/');
+}
+
+/**
+ * Temporarily suspend cache additions.
+ *
+ * Stops more data being added to the cache, but still allows cache retrieval.
+ * This is useful for actions, such as imports, when a lot of data would otherwise
+ * be almost uselessly added to the cache.
+ *
+ * Suspension lasts for a single page load at most. Remember to call this
+ * function again if you wish to re-enable cache adds earlier.
+ *
+ * @since 3.3.0
+ *
+ * @staticvar bool $_suspend
+ *
+ * @param bool $suspend Optional. Suspends additions if true, re-enables them if false.
+ * @return bool The current suspend setting
+ */
+function wp_suspend_cache_addition( $suspend = null ) {
+	static $_suspend = false;
+
+	if ( is_bool( $suspend ) )
+		$_suspend = $suspend;
+
+	return $_suspend;
+}
+
+/**
+ * Suspend cache invalidation.
+ *
+ * Turns cache invalidation on and off. Useful during imports where you don't wont to do
+ * invalidations every time a post is inserted. Callers must be sure that what they are
+ * doing won't lead to an inconsistent cache when invalidation is suspended.
+ *
+ * @since 2.7.0
+ *
+ * @global bool $_wp_suspend_cache_invalidation
+ *
+ * @param bool $suspend Optional. Whether to suspend or enable cache invalidation. Default true.
+ * @return bool The current suspend setting.
+ */
+function wp_suspend_cache_invalidation( $suspend = true ) {
+	global $_wp_suspend_cache_invalidation;
+
+	$current_suspend = $_wp_suspend_cache_invalidation;
+	$_wp_suspend_cache_invalidation = $suspend;
+	return $current_suspend;
+}
+
+/**
+ * Determine whether a site is the main site of the current network.
+ *
+ * @since 3.0.0
+ *
+ * @global object $current_site
+ *
+ * @param int $site_id Optional. Site ID to test. Defaults to current site.
+ *                     Defaults to current site.
+ * @return bool True if $site_id is the main site of the network, or if not
+ *              running Multisite.
+ */
+function is_main_site( $site_id = null ) {
+	// This is the current network's information; 'site' is old terminology.
+	global $current_site;
+
+	if ( ! is_multisite() )
+		return true;
+
+	if ( ! $site_id )
+		$site_id = get_current_blog_id();
+
+	return (int) $site_id === (int) $current_site->blog_id;
+}
+
+/**
+ * Determine whether a network is the main network of the Multisite install.
+ *
+ * @since 3.7.0
+ *
+ * @param int $network_id Optional. Network ID to test. Defaults to current network.
+ * @return bool True if $network_id is the main network, or if not running Multisite.
+ */
+function is_main_network( $network_id = null ) {
+	if ( ! is_multisite() ) {
+		return true;
+	}
+
+	$current_network_id = (int) get_current_site()->id;
+
+	if ( null === $network_id ) {
+		$network_id = $current_network_id;
+	}
+
+	$network_id = (int) $network_id;
+
+	return ( $network_id === get_main_network_id() );
+}
+
+/**
+ * Get the main network ID.
+ *
+ * @since 4.3.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @return int The ID of the main network.
+ */
+function get_main_network_id() {
+	global $wpdb;
+
+	if ( ! is_multisite() ) {
+		return 1;
+	}
+
+	if ( defined( 'PRIMARY_NETWORK_ID' ) ) {
+		$main_network_id = PRIMARY_NETWORK_ID;
+	} elseif ( 1 === (int) get_current_site()->id ) {
+		// If the current network has an ID of 1, assume it is the main network.
+		$main_network_id = 1;
+	} else {
+		$main_network_id = wp_cache_get( 'primary_network_id', 'site-options' );
+
+		if ( false === $main_network_id ) {
+			$main_network_id = (int) $wpdb->get_var( "SELECT id FROM {$wpdb->site} ORDER BY id LIMIT 1" );
+			wp_cache_add( 'primary_network_id', $main_network_id, 'site-options' );
+		}
+	}
+
+	/**
+	 * Filter the main network ID.
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param int $main_network_id The ID of the main network.
+	 */
+	return (int) apply_filters( 'get_main_network_id', $main_network_id );
+}
+
+/**
+ * Determine whether global terms are enabled.
+ *
+ * @since 3.0.0
+ *
+ * @staticvar bool $global_terms
+ *
+ * @return bool True if multisite and global terms enabled.
+ */
+function global_terms_enabled() {
+	if ( ! is_multisite() )
+		return false;
+
+	static $global_terms = null;
+	if ( is_null( $global_terms ) ) {
+
+		/**
+		 * Filter whether global terms are enabled.
+		 *
+		 * Passing a non-null value to the filter will effectively short-circuit the function,
+		 * returning the value of the 'global_terms_enabled' site option instead.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param null $enabled Whether global terms are enabled.
+		 */
+		$filter = apply_filters( 'global_terms_enabled', null );
+		if ( ! is_null( $filter ) )
+			$global_terms = (bool) $filter;
+		else
+			$global_terms = (bool) get_site_option( 'global_terms_enabled', false );
+	}
+	return $global_terms;
+}
+
+/**
+ * gmt_offset modification for smart timezone handling.
+ *
+ * Overrides the gmt_offset option if we have a timezone_string available.
+ *
+ * @since 2.8.0
+ *
+ * @return float|false Timezone GMT offset, false otherwise.
+ */
+function wp_timezone_override_offset() {
+	if ( !$timezone_string = get_option( 'timezone_string' ) ) {
+		return false;
+	}
+
+	$timezone_object = timezone_open( $timezone_string );
+	$datetime_object = date_create();
+	if ( false === $timezone_object || false === $datetime_object ) {
+		return false;
+	}
+	return round( timezone_offset_get( $timezone_object, $datetime_object ) / HOUR_IN_SECONDS, 2 );
+}
+
+/**
+ * Sort-helper for timezones.
+ *
+ * @since 2.9.0
+ * @access private
+ *
+ * @param array $a
+ * @param array $b
+ * @return int
+ */
+function _wp_timezone_choice_usort_callback( $a, $b ) {
+	// Don't use translated versions of Etc
+	if ( 'Etc' === $a['continent'] && 'Etc' === $b['continent'] ) {
+		// Make the order of these more like the old dropdown
+		if ( 'GMT+' === substr( $a['city'], 0, 4 ) && 'GMT+' === substr( $b['city'], 0, 4 ) ) {
+			return -1 * ( strnatcasecmp( $a['city'], $b['city'] ) );
+		}
+		if ( 'UTC' === $a['city'] ) {
+			if ( 'GMT+' === substr( $b['city'], 0, 4 ) ) {
+				return 1;
+			}
+			return -1;
+		}
+		if ( 'UTC' === $b['city'] ) {
+			if ( 'GMT+' === substr( $a['city'], 0, 4 ) ) {
+				return -1;
+			}
+			return 1;
+		}
+		return strnatcasecmp( $a['city'], $b['city'] );
+	}
+	if ( $a['t_continent'] == $b['t_continent'] ) {
+		if ( $a['t_city'] == $b['t_city'] ) {
+			return strnatcasecmp( $a['t_subcity'], $b['t_subcity'] );
+		}
+		return strnatcasecmp( $a['t_city'], $b['t_city'] );
+	} else {
+		// Force Etc to the bottom of the list
+		if ( 'Etc' === $a['continent'] ) {
+			return 1;
+		}
+		if ( 'Etc' === $b['continent'] ) {
+			return -1;
+		}
+		return strnatcasecmp( $a['t_continent'], $b['t_continent'] );
+	}
+}
+
+/**
+ * Gives a nicely-formatted list of timezone strings.
+ *
+ * @since 2.9.0
+ *
+ * @staticvar bool $mo_loaded
+ *
+ * @param string $selected_zone Selected timezone.
+ * @return string
+ */
+function wp_timezone_choice( $selected_zone ) {
+	static $mo_loaded = false;
+
+	$continents = array( 'Africa', 'America', 'Antarctica', 'Arctic', 'Asia', 'Atlantic', 'Australia', 'Europe', 'Indian', 'Pacific');
+
+	// Load translations for continents and cities
+	if ( !$mo_loaded ) {
+		$locale = get_locale();
+		$mofile = WP_LANG_DIR . '/continents-cities-' . $locale . '.mo';
+		load_textdomain( 'continents-cities', $mofile );
+		$mo_loaded = true;
+	}
+
+	$zonen = array();
+	foreach ( timezone_identifiers_list() as $zone ) {
+		$zone = explode( '/', $zone );
+		if ( !in_array( $zone[0], $continents ) ) {
+			continue;
+		}
+
+		// This determines what gets set and translated - we don't translate Etc/* strings here, they are done later
+		$exists = array(
+			0 => ( isset( $zone[0] ) && $zone[0] ),
+			1 => ( isset( $zone[1] ) && $zone[1] ),
+			2 => ( isset( $zone[2] ) && $zone[2] ),
+		);
+		$exists[3] = ( $exists[0] && 'Etc' !== $zone[0] );
+		$exists[4] = ( $exists[1] && $exists[3] );
+		$exists[5] = ( $exists[2] && $exists[3] );
+
+		$zonen[] = array(
+			'continent'   => ( $exists[0] ? $zone[0] : '' ),
+			'city'        => ( $exists[1] ? $zone[1] : '' ),
+			'subcity'     => ( $exists[2] ? $zone[2] : '' ),
+			't_continent' => ( $exists[3] ? translate( str_replace( '_', ' ', $zone[0] ), 'continents-cities' ) : '' ),
+			't_city'      => ( $exists[4] ? translate( str_replace( '_', ' ', $zone[1] ), 'continents-cities' ) : '' ),
+			't_subcity'   => ( $exists[5] ? translate( str_replace( '_', ' ', $zone[2] ), 'continents-cities' ) : '' )
+		);
+	}
+	usort( $zonen, '_wp_timezone_choice_usort_callback' );
+
+	$structure = array();
+
+	if ( empty( $selected_zone ) ) {
+		$structure[] = '<option selected="selected" value="">' . __( 'Select a city' ) . '</option>';
+	}
+
+	foreach ( $zonen as $key => $zone ) {
+		// Build value in an array to join later
+		$value = array( $zone['continent'] );
+
+		if ( empty( $zone['city'] ) ) {
+			// It's at the continent level (generally won't happen)
+			$display = $zone['t_continent'];
+		} else {
+			// It's inside a continent group
+
+			// Continent optgroup
+			if ( !isset( $zonen[$key - 1] ) || $zonen[$key - 1]['continent'] !== $zone['continent'] ) {
+				$label = $zone['t_continent'];
+				$structure[] = '<optgroup label="'. esc_attr( $label ) .'">';
+			}
+
+			// Add the city to the value
+			$value[] = $zone['city'];
+
+			$display = $zone['t_city'];
+			if ( !empty( $zone['subcity'] ) ) {
+				// Add the subcity to the value
+				$value[] = $zone['subcity'];
+				$display .= ' - ' . $zone['t_subcity'];
+			}
+		}
+
+		// Build the value
+		$value = join( '/', $value );
+		$selected = '';
+		if ( $value === $selected_zone ) {
+			$selected = 'selected="selected" ';
+		}
+		$structure[] = '<option ' . $selected . 'value="' . esc_attr( $value ) . '">' . esc_html( $display ) . "</option>";
+
+		// Close continent optgroup
+		if ( !empty( $zone['city'] ) && ( !isset($zonen[$key + 1]) || (isset( $zonen[$key + 1] ) && $zonen[$key + 1]['continent'] !== $zone['continent']) ) ) {
+			$structure[] = '</optgroup>';
+		}
+	}
+
+	// Do UTC
+	$structure[] = '<optgroup label="'. esc_attr__( 'UTC' ) .'">';
+	$selected = '';
+	if ( 'UTC' === $selected_zone )
+		$selected = 'selected="selected" ';
+	$structure[] = '<option ' . $selected . 'value="' . esc_attr( 'UTC' ) . '">' . __('UTC') . '</option>';
+	$structure[] = '</optgroup>';
+
+	// Do manual UTC offsets
+	$structure[] = '<optgroup label="'. esc_attr__( 'Manual Offsets' ) .'">';
+	$offset_range = array (-12, -11.5, -11, -10.5, -10, -9.5, -9, -8.5, -8, -7.5, -7, -6.5, -6, -5.5, -5, -4.5, -4, -3.5, -3, -2.5, -2, -1.5, -1, -0.5,
+		0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 5.75, 6, 6.5, 7, 7.5, 8, 8.5, 8.75, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.75, 13, 13.75, 14);
+	foreach ( $offset_range as $offset ) {
+		if ( 0 <= $offset )
+			$offset_name = '+' . $offset;
+		else
+			$offset_name = (string) $offset;
+
+		$offset_value = $offset_name;
+		$offset_name = str_replace(array('.25','.5','.75'), array(':15',':30',':45'), $offset_name);
+		$offset_name = 'UTC' . $offset_name;
+		$offset_value = 'UTC' . $offset_value;
+		$selected = '';
+		if ( $offset_value === $selected_zone )
+			$selected = 'selected="selected" ';
+		$structure[] = '<option ' . $selected . 'value="' . esc_attr( $offset_value ) . '">' . esc_html( $offset_name ) . "</option>";
+
+	}
+	$structure[] = '</optgroup>';
+
+	return join( "\n", $structure );
+}
+
+/**
+ * Strip close comment and close php tags from file headers used by WP.
+ *
+ * @since 2.8.0
+ * @access private
+ *
+ * @see https://core.trac.wordpress.org/ticket/8497
+ *
+ * @param string $str Header comment to clean up.
+ * @return string
+ */
+function _cleanup_header_comment( $str ) {
+	return trim(preg_replace("/\s*(?:\*\/|\?>).*/", '', $str));
+}
+
+/**
+ * Permanently delete comments or posts of any type that have held a status
+ * of 'trash' for the number of days defined in EMPTY_TRASH_DAYS.
+ *
+ * The default value of `EMPTY_TRASH_DAYS` is 30 (days).
+ *
+ * @since 2.9.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ */
+function wp_scheduled_delete() {
+	global $wpdb;
+
+	$delete_timestamp = time() - ( DAY_IN_SECONDS * EMPTY_TRASH_DAYS );
+
+	$posts_to_delete = $wpdb->get_results($wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wp_trash_meta_time' AND meta_value < '%d'", $delete_timestamp), ARRAY_A);
+
+	foreach ( (array) $posts_to_delete as $post ) {
+		$post_id = (int) $post['post_id'];
+		if ( !$post_id )
+			continue;
+
+		$del_post = get_post($post_id);
+
+		if ( !$del_post || 'trash' != $del_post->post_status ) {
+			delete_post_meta($post_id, '_wp_trash_meta_status');
+			delete_post_meta($post_id, '_wp_trash_meta_time');
+		} else {
+			wp_delete_post($post_id);
+		}
+	}
+
+	$comments_to_delete = $wpdb->get_results($wpdb->prepare("SELECT comment_id FROM $wpdb->commentmeta WHERE meta_key = '_wp_trash_meta_time' AND meta_value < '%d'", $delete_timestamp), ARRAY_A);
+
+	foreach ( (array) $comments_to_delete as $comment ) {
+		$comment_id = (int) $comment['comment_id'];
+		if ( !$comment_id )
+			continue;
+
+		$del_comment = get_comment($comment_id);
+
+		if ( !$del_comment || 'trash' != $del_comment->comment_approved ) {
+			delete_comment_meta($comment_id, '_wp_trash_meta_time');
+			delete_comment_meta($comment_id, '_wp_trash_meta_status');
+		} else {
+			wp_delete_comment( $del_comment );
+		}
+	}
+}
+
+/**
+ * Retrieve metadata from a file.
+ *
+ * Searches for metadata in the first 8kiB of a file, such as a plugin or theme.
+ * Each piece of metadata must be on its own line. Fields can not span multiple
+ * lines, the value will get cut at the end of the first line.
+ *
+ * If the file data is not within that first 8kiB, then the author should correct
+ * their plugin file and move the data headers to the top.
+ *
+ * @link https://codex.wordpress.org/File_Header
+ *
+ * @since 2.9.0
+ *
+ * @param string $file            Path to the file.
+ * @param array  $default_headers List of headers, in the format array('HeaderKey' => 'Header Name').
+ * @param string $context         Optional. If specified adds filter hook "extra_{$context}_headers".
+ *                                Default empty.
+ * @return array Array of file headers in `HeaderKey => Header Value` format.
+ */
+function get_file_data( $file, $default_headers, $context = '' ) {
+	// We don't need to write to the file, so just open for reading.
+	$fp = fopen( $file, 'r' );
+
+	// Pull only the first 8kiB of the file in.
+	$file_data = fread( $fp, 8192 );
+
+	// PHP will close file handle, but we are good citizens.
+	fclose( $fp );
+
+	// Make sure we catch CR-only line endings.
+	$file_data = str_replace( "\r", "\n", $file_data );
+
+	/**
+	 * Filter extra file headers by context.
+	 *
+	 * The dynamic portion of the hook name, `$context`, refers to
+	 * the context where extra headers might be loaded.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param array $extra_context_headers Empty array by default.
+	 */
+	if ( $context && $extra_headers = apply_filters( "extra_{$context}_headers", array() ) ) {
+		$extra_headers = array_combine( $extra_headers, $extra_headers ); // keys equal values
+		$all_headers = array_merge( $extra_headers, (array) $default_headers );
+	} else {
+		$all_headers = $default_headers;
+	}
+
+	foreach ( $all_headers as $field => $regex ) {
+		if ( preg_match( '/^[ \t\/*#@]*' . preg_quote( $regex, '/' ) . ':(.*)$/mi', $file_data, $match ) && $match[1] )
+			$all_headers[ $field ] = _cleanup_header_comment( $match[1] );
+		else
+			$all_headers[ $field ] = '';
+	}
+
+	return $all_headers;
+}
+
+/**
+ * Returns true.
+ *
+ * Useful for returning true to filters easily.
+ *
+ * @since 3.0.0
+ *
+ * @see __return_false()
+ *
+ * @return true True.
+ */
+function __return_true() {
+	return true;
+}
+
+/**
+ * Returns false.
+ *
+ * Useful for returning false to filters easily.
+ *
+ * @since 3.0.0
+ *
+ * @see __return_true()
+ *
+ * @return false False.
+ */
+function __return_false() {
+	return false;
+}
+
+/**
+ * Returns 0.
+ *
+ * Useful for returning 0 to filters easily.
+ *
+ * @since 3.0.0
+ *
+ * @return int 0.
+ */
+function __return_zero() {
+	return 0;
+}
+
+/**
+ * Returns an empty array.
+ *
+ * Useful for returning an empty array to filters easily.
+ *
+ * @since 3.0.0
+ *
+ * @return array Empty array.
+ */
+function __return_empty_array() {
+	return array();
+}
+
+/**
+ * Returns null.
+ *
+ * Useful for returning null to filters easily.
+ *
+ * @since 3.4.0
+ *
+ * @return null Null value.
+ */
+function __return_null() {
+	return null;
+}
+
+/**
+ * Returns an empty string.
+ *
+ * Useful for returning an empty string to filters easily.
+ *
+ * @since 3.7.0
+ *
+ * @see __return_null()
+ *
+ * @return string Empty string.
+ */
+function __return_empty_string() {
+	return '';
+}
+
+/**
+ * Send a HTTP header to disable content type sniffing in browsers which support it.
+ *
+ * @since 3.0.0
+ *
+ * @see http://blogs.msdn.com/ie/archive/2008/07/02/ie8-security-part-v-comprehensive-protection.aspx
+ * @see http://src.chromium.org/viewvc/chrome?view=rev&revision=6985
+ */
+function send_nosniff_header() {
+	@header( 'X-Content-Type-Options: nosniff' );
+}
+
+/**
+ * Return a MySQL expression for selecting the week number based on the start_of_week option.
+ *
+ * @ignore
+ * @since 3.0.0
+ *
+ * @param string $column Database column.
+ * @return string SQL clause.
+ */
+function _wp_mysql_week( $column ) {
+	switch ( $start_of_week = (int) get_option( 'start_of_week' ) ) {
+	case 1 :
+		return "WEEK( $column, 1 )";
+	case 2 :
+	case 3 :
+	case 4 :
+	case 5 :
+	case 6 :
+		return "WEEK( DATE_SUB( $column, INTERVAL $start_of_week DAY ), 0 )";
+	case 0 :
+	default :
+		return "WEEK( $column, 0 )";
+	}
+}
+
+/**
+ * Find hierarchy loops using a callback function that maps object IDs to parent IDs.
+ *
+ * @since 3.1.0
+ * @access private
+ *
+ * @param callable $callback      Function that accepts ( ID, $callback_args ) and outputs parent_ID.
+ * @param int      $start         The ID to start the loop check at.
+ * @param int      $start_parent  The parent_ID of $start to use instead of calling $callback( $start ).
+ *                                Use null to always use $callback
+ * @param array    $callback_args Optional. Additional arguments to send to $callback.
+ * @return array IDs of all members of loop.
+ */
+function wp_find_hierarchy_loop( $callback, $start, $start_parent, $callback_args = array() ) {
+	$override = is_null( $start_parent ) ? array() : array( $start => $start_parent );
+
+	if ( !$arbitrary_loop_member = wp_find_hierarchy_loop_tortoise_hare( $callback, $start, $override, $callback_args ) )
+		return array();
+
+	return wp_find_hierarchy_loop_tortoise_hare( $callback, $arbitrary_loop_member, $override, $callback_args, true );
+}
+
+/**
+ * Use the "The Tortoise and the Hare" algorithm to detect loops.
+ *
+ * For every step of the algorithm, the hare takes two steps and the tortoise one.
+ * If the hare ever laps the tortoise, there must be a loop.
+ *
+ * @since 3.1.0
+ * @access private
+ *
+ * @param callable $callback      Function that accepts ( ID, callback_arg, ... ) and outputs parent_ID.
+ * @param int      $start         The ID to start the loop check at.
+ * @param array    $override      Optional. An array of ( ID => parent_ID, ... ) to use instead of $callback.
+ *                                Default empty array.
+ * @param array    $callback_args Optional. Additional arguments to send to $callback. Default empty array.
+ * @param bool     $_return_loop  Optional. Return loop members or just detect presence of loop? Only set
+ *                                to true if you already know the given $start is part of a loop (otherwise
+ *                                the returned array might include branches). Default false.
+ * @return mixed Scalar ID of some arbitrary member of the loop, or array of IDs of all members of loop if
+ *               $_return_loop
+ */
+function wp_find_hierarchy_loop_tortoise_hare( $callback, $start, $override = array(), $callback_args = array(), $_return_loop = false ) {
+	$tortoise = $hare = $evanescent_hare = $start;
+	$return = array();
+
+	// Set evanescent_hare to one past hare
+	// Increment hare two steps
+	while (
+		$tortoise
+	&&
+		( $evanescent_hare = isset( $override[$hare] ) ? $override[$hare] : call_user_func_array( $callback, array_merge( array( $hare ), $callback_args ) ) )
+	&&
+		( $hare = isset( $override[$evanescent_hare] ) ? $override[$evanescent_hare] : call_user_func_array( $callback, array_merge( array( $evanescent_hare ), $callback_args ) ) )
+	) {
+		if ( $_return_loop )
+			$return[$tortoise] = $return[$evanescent_hare] = $return[$hare] = true;
+
+		// tortoise got lapped - must be a loop
+		if ( $tortoise == $evanescent_hare || $tortoise == $hare )
+			return $_return_loop ? $return : $tortoise;
+
+		// Increment tortoise by one step
+		$tortoise = isset( $override[$tortoise] ) ? $override[$tortoise] : call_user_func_array( $callback, array_merge( array( $tortoise ), $callback_args ) );
+	}
+
+	return false;
+}
+
+/**
+ * Send a HTTP header to limit rendering of pages to same origin iframes.
+ *
+ * @since 3.1.3
+ *
+ * @see https://developer.mozilla.org/en/the_x-frame-options_response_header
+ */
+function send_frame_options_header() {
+	@header( 'X-Frame-Options: SAMEORIGIN' );
+}
+
+/**
+ * Retrieve a list of protocols to allow in HTML attributes.
+ *
+ * @since 3.3.0
+ * @since 4.3.0 Added 'webcal' to the protocols array.
+ *
+ * @see wp_kses()
+ * @see esc_url()
+ *
+ * @staticvar array $protocols
+ *
+ * @return array Array of allowed protocols. Defaults to an array containing 'http', 'https',
+ *               'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet',
+ *               'mms', 'rtsp', 'svn', 'tel', 'fax', 'xmpp', and 'webcal'.
+ */
+function wp_allowed_protocols() {
+	static $protocols = array();
+
+	if ( empty( $protocols ) ) {
+		$protocols = array( 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn', 'tel', 'fax', 'xmpp', 'webcal' );
+
+		/**
+		 * Filter the list of protocols allowed in HTML attributes.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param array $protocols Array of allowed protocols e.g. 'http', 'ftp', 'tel', and more.
+		 */
+		$protocols = apply_filters( 'kses_allowed_protocols', $protocols );
+	}
+
+	return $protocols;
+}
+
+/**
+ * Return a comma-separated string of functions that have been called to get
+ * to the current point in code.
+ *
+ * @since 3.4.0
+ *
+ * @see https://core.trac.wordpress.org/ticket/19589
+ *
+ * @param string $ignore_class Optional. A class to ignore all function calls within - useful
+ *                             when you want to just give info about the callee. Default null.
+ * @param int    $skip_frames  Optional. A number of stack frames to skip - useful for unwinding
+ *                             back to the source of the issue. Default 0.
+ * @param bool   $pretty       Optional. Whether or not you want a comma separated string or raw
+ *                             array returned. Default true.
+ * @return string|array Either a string containing a reversed comma separated trace or an array
+ *                      of individual calls.
+ */
+function wp_debug_backtrace_summary( $ignore_class = null, $skip_frames = 0, $pretty = true ) {
+	if ( version_compare( PHP_VERSION, '5.2.5', '>=' ) )
+		$trace = debug_backtrace( false );
+	else
+		$trace = debug_backtrace();
+
+	$caller = array();
+	$check_class = ! is_null( $ignore_class );
+	$skip_frames++; // skip this function
+
+	foreach ( $trace as $call ) {
+		if ( $skip_frames > 0 ) {
+			$skip_frames--;
+		} elseif ( isset( $call['class'] ) ) {
+			if ( $check_class && $ignore_class == $call['class'] )
+				continue; // Filter out calls
+
+			$caller[] = "{$call['class']}{$call['type']}{$call['function']}";
+		} else {
+			if ( in_array( $call['function'], array( 'do_action', 'apply_filters' ) ) ) {
+				$caller[] = "{$call['function']}('{$call['args'][0]}')";
+			} elseif ( in_array( $call['function'], array( 'include', 'include_once', 'require', 'require_once' ) ) ) {
+				$caller[] = $call['function'] . "('" . str_replace( array( WP_CONTENT_DIR, ABSPATH ) , '', $call['args'][0] ) . "')";
+			} else {
+				$caller[] = $call['function'];
+			}
+		}
+	}
+	if ( $pretty )
+		return join( ', ', array_reverse( $caller ) );
+	else
+		return $caller;
+}
+
+/**
+ * Retrieve ids that are not already present in the cache.
+ *
+ * @since 3.4.0
+ * @access private
+ *
+ * @param array  $object_ids ID list.
+ * @param string $cache_key  The cache bucket to check against.
+ *
+ * @return array List of ids not present in the cache.
+ */
+function _get_non_cached_ids( $object_ids, $cache_key ) {
+	$clean = array();
+	foreach ( $object_ids as $id ) {
+		$id = (int) $id;
+		if ( !wp_cache_get( $id, $cache_key ) ) {
+			$clean[] = $id;
+		}
+	}
+
+	return $clean;
+}
+
+/**
+ * Test if the current device has the capability to upload files.
+ *
+ * @since 3.4.0
+ * @access private
+ *
+ * @return bool Whether the device is able to upload files.
+ */
+function _device_can_upload() {
+	if ( ! wp_is_mobile() )
+		return true;
+
+	$ua = $_SERVER['HTTP_USER_AGENT'];
+
+	if ( strpos($ua, 'iPhone') !== false
+		|| strpos($ua, 'iPad') !== false
+		|| strpos($ua, 'iPod') !== false ) {
+			return preg_match( '#OS ([\d_]+) like Mac OS X#', $ua, $version ) && version_compare( $version[1], '6', '>=' );
+	}
+
+	return true;
+}
+
+/**
+ * Test if a given path is a stream URL
+ *
+ * @param string $path The resource path or URL.
+ * @return bool True if the path is a stream URL.
+ */
+function wp_is_stream( $path ) {
+	$wrappers = stream_get_wrappers();
+	$wrappers_re = '(' . join('|', $wrappers) . ')';
+
+	return preg_match( "!^$wrappers_re://!", $path ) === 1;
+}
+
+/**
+ * Test if the supplied date is valid for the Gregorian calendar.
+ *
+ * @since 3.5.0
+ *
+ * @see checkdate()
+ *
+ * @param  int    $month       Month number.
+ * @param  int    $day         Day number.
+ * @param  int    $year        Year number.
+ * @param  string $source_date The date to filter.
+ * @return bool True if valid date, false if not valid date.
+ */
+function wp_checkdate( $month, $day, $year, $source_date ) {
+	/**
+	 * Filter whether the given date is valid for the Gregorian calendar.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @param bool   $checkdate   Whether the given date is valid.
+	 * @param string $source_date Date to check.
+	 */
+	return apply_filters( 'wp_checkdate', checkdate( $month, $day, $year ), $source_date );
+}
+
+/**
+ * Load the auth check for monitoring whether the user is still logged in.
+ *
+ * Can be disabled with remove_action( 'admin_enqueue_scripts', 'wp_auth_check_load' );
+ *
+ * This is disabled for certain screens where a login screen could cause an
+ * inconvenient interruption. A filter called wp_auth_check_load can be used
+ * for fine-grained control.
+ *
+ * @since 3.6.0
+ */
+function wp_auth_check_load() {
+	if ( ! is_admin() && ! is_user_logged_in() )
+		return;
+
+	if ( defined( 'IFRAME_REQUEST' ) )
+		return;
+
+	$screen = get_current_screen();
+	$hidden = array( 'update', 'update-network', 'update-core', 'update-core-network', 'upgrade', 'upgrade-network', 'network' );
+	$show = ! in_array( $screen->id, $hidden );
+
+	/**
+	 * Filter whether to load the authentication check.
+	 *
+	 * Passing a falsey value to the filter will effectively short-circuit
+	 * loading the authentication check.
+	 *
+	 * @since 3.6.0
+	 *
+	 * @param bool      $show   Whether to load the authentication check.
+	 * @param WP_Screen $screen The current screen object.
+	 */
+	if ( apply_filters( 'wp_auth_check_load', $show, $screen ) ) {
+		wp_enqueue_style( 'wp-auth-check' );
+		wp_enqueue_script( 'wp-auth-check' );
+
+		add_action( 'admin_print_footer_scripts', 'wp_auth_check_html', 5 );
+		add_action( 'wp_print_footer_scripts', 'wp_auth_check_html', 5 );
+	}
+}
+
+/**
+ * Output the HTML that shows the wp-login dialog when the user is no longer logged in.
+ *
+ * @since 3.6.0
+ */
+function wp_auth_check_html() {
+	$login_url = wp_login_url();
+	$current_domain = ( is_ssl() ? 'https://' : 'http://' ) . $_SERVER['HTTP_HOST'];
+	$same_domain = ( strpos( $login_url, $current_domain ) === 0 );
+
+	/**
+	 * Filter whether the authentication check originated at the same domain.
+	 *
+	 * @since 3.6.0
+	 *
+	 * @param bool $same_domain Whether the authentication check originated at the same domain.
+	 */
+	$same_domain = apply_filters( 'wp_auth_check_same_domain', $same_domain );
+	$wrap_class = $same_domain ? 'hidden' : 'hidden fallback';
+
+	?>
+	<div id="wp-auth-check-wrap" class="<?php echo $wrap_class; ?>">
+	<div id="wp-auth-check-bg"></div>
+	<div id="wp-auth-check">
+	<button type="button" class="wp-auth-check-close button-link"><span class="screen-reader-text"><?php _e( 'Close dialog' ); ?></span></button>
+	<?php
+
+	if ( $same_domain ) {
+		?>
+		<div id="wp-auth-check-form" class="loading" data-src="<?php echo esc_url( add_query_arg( array( 'interim-login' => 1 ), $login_url ) ); ?>"></div>
+		<?php
+	}
+
+	?>
+	<div class="wp-auth-fallback">
+		<p><b class="wp-auth-fallback-expired" tabindex="0"><?php _e('Session expired'); ?></b></p>
+		<p><a href="<?php echo esc_url( $login_url ); ?>" target="_blank"><?php _e('Please log in again.'); ?></a>
+		<?php _e('The login page will open in a new window. After logging in you can close it and return to this page.'); ?></p>
+	</div>
+	</div>
+	</div>
+	<?php
+}
+
+/**
+ * Check whether a user is still logged in, for the heartbeat.
+ *
+ * Send a result that shows a log-in box if the user is no longer logged in,
+ * or if their cookie is within the grace period.
+ *
+ * @since 3.6.0
+ *
+ * @global int $login_grace_period
+ *
+ * @param array $response  The Heartbeat response.
+ * @return array $response The Heartbeat response with 'wp-auth-check' value set.
+ */
+function wp_auth_check( $response ) {
+	$response['wp-auth-check'] = is_user_logged_in() && empty( $GLOBALS['login_grace_period'] );
+	return $response;
+}
+
+/**
+ * Return RegEx body to liberally match an opening HTML tag.
+ *
+ * Matches an opening HTML tag that:
+ * 1. Is self-closing or
+ * 2. Has no body but has a closing tag of the same name or
+ * 3. Contains a body and a closing tag of the same name
+ *
+ * Note: this RegEx does not balance inner tags and does not attempt
+ * to produce valid HTML
+ *
+ * @since 3.6.0
+ *
+ * @param string $tag An HTML tag name. Example: 'video'.
+ * @return string Tag RegEx.
+ */
+function get_tag_regex( $tag ) {
+	if ( empty( $tag ) )
+		return;
+	return sprintf( '<%1$s[^<]*(?:>[\s\S]*<\/%1$s>|\s*\/>)', tag_escape( $tag ) );
+}
+
+/**
+ * Retrieve a canonical form of the provided charset appropriate for passing to PHP
+ * functions such as htmlspecialchars() and charset html attributes.
+ *
+ * @since 3.6.0
+ * @access private
+ *
+ * @see https://core.trac.wordpress.org/ticket/23688
+ *
+ * @param string $charset A charset name.
+ * @return string The canonical form of the charset.
+ */
+function _canonical_charset( $charset ) {
+	if ( 'UTF-8' === $charset || 'utf-8' === $charset || 'utf8' === $charset ||
+		'UTF8' === $charset )
+		return 'UTF-8';
+
+	if ( 'ISO-8859-1' === $charset || 'iso-8859-1' === $charset ||
+		'iso8859-1' === $charset || 'ISO8859-1' === $charset )
+		return 'ISO-8859-1';
+
+	return $charset;
+}
+
+/**
+ * Set the mbstring internal encoding to a binary safe encoding when func_overload
+ * is enabled.
+ *
+ * When mbstring.func_overload is in use for multi-byte encodings, the results from
+ * strlen() and similar functions respect the utf8 characters, causing binary data
+ * to return incorrect lengths.
+ *
+ * This function overrides the mbstring encoding to a binary-safe encoding, and
+ * resets it to the users expected encoding afterwards through the
+ * `reset_mbstring_encoding` function.
+ *
+ * It is safe to recursively call this function, however each
+ * `mbstring_binary_safe_encoding()` call must be followed up with an equal number
+ * of `reset_mbstring_encoding()` calls.
+ *
+ * @since 3.7.0
+ *
+ * @see reset_mbstring_encoding()
+ *
+ * @staticvar array $encodings
+ * @staticvar bool  $overloaded
+ *
+ * @param bool $reset Optional. Whether to reset the encoding back to a previously-set encoding.
+ *                    Default false.
+ */
+function mbstring_binary_safe_encoding( $reset = false ) {
+	static $encodings = array();
+	static $overloaded = null;
+
+	if ( is_null( $overloaded ) )
+		$overloaded = function_exists( 'mb_internal_encoding' ) && ( ini_get( 'mbstring.func_overload' ) & 2 );
+
+	if ( false === $overloaded )
+		return;
+
+	if ( ! $reset ) {
+		$encoding = mb_internal_encoding();
+		array_push( $encodings, $encoding );
+		mb_internal_encoding( 'ISO-8859-1' );
+	}
+
+	if ( $reset && $encodings ) {
+		$encoding = array_pop( $encodings );
+		mb_internal_encoding( $encoding );
+	}
+}
+
+/**
+ * Reset the mbstring internal encoding to a users previously set encoding.
+ *
+ * @see mbstring_binary_safe_encoding()
+ *
+ * @since 3.7.0
+ */
+function reset_mbstring_encoding() {
+	mbstring_binary_safe_encoding( true );
+}
+
+/**
+ * Filter/validate a variable as a boolean.
+ *
+ * Alternative to `filter_var( $var, FILTER_VALIDATE_BOOLEAN )`.
+ *
+ * @since 4.0.0
+ *
+ * @param mixed $var Boolean value to validate.
+ * @return bool Whether the value is validated.
+ */
+function wp_validate_boolean( $var ) {
+	if ( is_bool( $var ) ) {
+		return $var;
+	}
+
+	if ( is_string( $var ) && 'false' === strtolower( $var ) ) {
+		return false;
+	}
+
+	return (bool) $var;
+}
+
+/**
+ * Delete a file
+ *
+ * @since 4.2.0
+ *
+ * @param string $file The path to the file to delete.
+ */
+function wp_delete_file( $file ) {
+	/**
+	 * Filter the path of the file to delete.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $medium Path to the file to delete.
+	 */
+	$delete = apply_filters( 'wp_delete_file', $file );
+	if ( ! empty( $delete ) ) {
+		@unlink( $delete );
+	}
+}
+
+/**
+ * Outputs a small JS snippet on preview tabs/windows to remove `window.name` on unload.
+ *
+ * This prevents reusing the same tab for a preview when the user has navigated away.
+ *
+ * @since 4.3.0
+ */
+function wp_post_preview_js() {
+	global $post;
+
+	if ( ! is_preview() || empty( $post ) ) {
+		return;
+	}
+
+	// Has to match the window name used in post_submit_meta_box()
+	$name = 'wp-preview-' . (int) $post->ID;
+
+	?>
+	<script>
+	( function() {
+		var query = document.location.search;
+
+		if ( query && query.indexOf( 'preview=true' ) !== -1 ) {
+			window.name = '<?php echo $name; ?>';
+		}
+
+		if ( window.addEventListener ) {
+			window.addEventListener( 'unload', function() { window.name = ''; }, false );
+		}
+	}());
+	</script>
+	<?php
+}
+
+/**
+ * Parses and formats a MySQL datetime (Y-m-d H:i:s) for ISO8601/RFC3339.
+ *
+ * Explicitly strips timezones, as datetimes are not saved with any timezone
+ * information. Including any information on the offset could be misleading.
+ *
+ * @since 4.4.0
+ *
+ * @param string $date_string Date string to parse and format.
+ * @return string Date formatted for ISO8601/RFC3339.
+ */
+function mysql_to_rfc3339( $date_string ) {
+	$formatted = mysql2date( 'c', $date_string, false );
+
+	// Strip timezone information
+	return preg_replace( '/(?:Z|[+-]\d{2}(?::\d{2})?)$/', '', $formatted );
+}
diff --git a/wp-load.php b/wp-load.php
index 94a8b54..4465898 100644
--- a/wp-load.php
+++ b/wp-load.php
@@ -72,22 +72,46 @@
 	wp_load_translations_early();
 
 	// Die with an error message
-	$die  = sprintf(
+	$die = sprintf(
+		__( '<h1 id="logo"><a href="%s">WordPress</a></h1>' ),
+		/* translators: %s: WordPress url */
+		__( 'https://wordpress.org/' )
+	);
+	$die .= '<h1>' . __( 'Welcome to WordPress' ) . '</h1>';
+	$die .= '<p>' . __( "In just a few minutes, you'll be all set up with WordPress and ready to create your own corner of the web." ) . '</p>';
+	$die .= '<p>' . sprintf(
+		/* translators: %s: Codex plugins url, Codex themes url */
+		__( 'This free and Open Source software is built and maintained by a community of hundreds of volunteers. Transform your website with countless of <a href="%1$s">plugins</a> and <a href="%2$s">themes</a> available from right within WordPress.' ),
+		'https://wordpress.org/plugins/',
+		'https://wordpress.org/themes/'
+	) . '</p>';
+	$die .= '<p>' . __( 'Write your blog, build your first website, launch your business, share your photos with your friends. You can do just about anything you can imagine.' ) . '</p>';
+	$die .= '<p>' . sprintf(
+		__( '<a href="%1$s" class="button button-large">%2$s</a>' ),
+		$path,
+		__( "Let's Get Started!" )
+	) . '</p>';
+	$die .= sprintf(
 		/* translators: %s: wp-config.php */
 		__( "There doesn't seem to be a %s file. I need this before we can get started." ),
 		'<code>wp-config.php</code>'
 	) . '</p>';
 	$die .= '<p>' . sprintf(
 		/* translators: %s: Codex URL */
-		__( "Need more help? <a href='%s'>We got it</a>." ),
-		__( 'https://codex.wordpress.org/Editing_wp-config.php' )
+		__( 'Need more help? <a href="%1$s">%2$s</a>.' ),
+		__( 'https://codex.wordpress.org/Editing_wp-config.php' ),
+		__( 'We got it' )
 	) . '</p>';
 	$die .= '<p>' . sprintf(
 		/* translators: %s: wp-config.php */
 		__( "You can create a %s file through a web interface, but this doesn't work for all server setups. The safest way is to manually create the file." ),
 		'<code>wp-config.php</code>'
 	) . '</p>';
-	$die .= '<p><a href="' . $path . '" class="button button-large">' . __( "Create a Configuration File" ) . '</a>';
+	$die .= '<p>' . sprintf(
+			'<a href="%s" class="button button-large">%s</a>',
+			$path,
+			__( 'Create a Configuration File' )
+	) . '</p>';
 
-	wp_die( $die, __( 'WordPress &rsaquo; Error' ) );
+	wp_die( $die, __( 'Welcome to WordPress!' ), array( 'error' => false, 'raw' => true ) );
 }