Ticket #57553: load.php

<?php
/**
 * These functions are needed to load WordPress.
 *
 * @package WordPress
 */

/**
 * Return the HTTP protocol sent by the server.
 *
 * @since 4.4.0
 *
 * @return string The HTTP protocol. Default: HTTP/1.0.
 */
function wp_get_server_protocol() {
        $protocol = isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : '';
        if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0', 'HTTP/3' ), true ) ) {
                $protocol = 'HTTP/1.0';
        }
        return $protocol;
}

/**
 * Fix `$_SERVER` variables for various setups.
 *
 * @since 3.0.0
 * @access private
 *
 * @global string $PHP_SELF The filename of the currently executing script,
 *                          relative to the document root.
 */
function wp_fix_server_vars() {
        global $PHP_SELF;

        $default_server_values = array(
                'SERVER_SOFTWARE' => '',
                'REQUEST_URI'     => '',
        );

        $_SERVER = array_merge( $default_server_values, $_SERVER );

        // Fix for IIS when running with PHP ISAPI.
        if ( empty( $_SERVER['REQUEST_URI'] ) || ( 'cgi-fcgi' !== PHP_SAPI && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {

                if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
                        // IIS Mod-Rewrite.
                        $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL'];
                } elseif ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) {
                        // IIS Isapi_Rewrite.
                        $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL'];
                } else {
                        // Use ORIG_PATH_INFO if there is no PATH_INFO.
                        if ( ! isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) ) {
                                $_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];
                        }

                        // Some IIS + PHP configurations put the script-name in the path-info (no need to append it twice).
                        if ( isset( $_SERVER['PATH_INFO'] ) ) {
                                if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] ) {
                                        $_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
                                } else {
                                        $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
                                }
                        }

                        // Append the query string if it exists and isn't null.
                        if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
                                $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
                        }
                }
        }

        // Fix for PHP as CGI hosts that set SCRIPT_FILENAME to something ending in php.cgi for all requests.
        if ( isset( $_SERVER['SCRIPT_FILENAME'] ) && ( strpos( $_SERVER['SCRIPT_FILENAME'], 'php.cgi' ) == strlen( $_SERVER['SCRIPT_FILENAME'] ) - 7 ) ) {
                $_SERVER['SCRIPT_FILENAME'] = $_SERVER['PATH_TRANSLATED'];
        }

        // Fix for Dreamhost and other PHP as CGI hosts.
        if ( isset( $_SERVER['SCRIPT_NAME'] ) && ( strpos( $_SERVER['SCRIPT_NAME'], 'php.cgi' ) !== false ) ) {
                unset( $_SERVER['PATH_INFO'] );
        }

        // Fix empty PHP_SELF.
        $PHP_SELF = $_SERVER['PHP_SELF'];
        if ( empty( $PHP_SELF ) ) {
                $_SERVER['PHP_SELF'] = preg_replace( '/(\?.*)?$/', '', $_SERVER['REQUEST_URI'] );
                $PHP_SELF            = $_SERVER['PHP_SELF'];
        }

        wp_populate_basic_auth_from_authorization_header();
}

/**
 * Populates the Basic Auth server details from the Authorization header.
 *
 * Some servers running in CGI or FastCGI mode don't pass the Authorization
 * header on to WordPress.  If it's been rewritten to the `HTTP_AUTHORIZATION` header,
 * fill in the proper $_SERVER variables instead.
 *
 * @since 5.6.0
 */
function wp_populate_basic_auth_from_authorization_header() {
        // If we don't have anything to pull from, return early.
        if ( ! isset( $_SERVER['HTTP_AUTHORIZATION'] ) && ! isset( $_SERVER['REDIRECT_HTTP_AUTHORIZATION'] ) ) {
                return;
        }

        // If either PHP_AUTH key is already set, do nothing.
        if ( isset( $_SERVER['PHP_AUTH_USER'] ) || isset( $_SERVER['PHP_AUTH_PW'] ) ) {
                return;
        }

        // From our prior conditional, one of these must be set.
        $header = isset( $_SERVER['HTTP_AUTHORIZATION'] ) ? $_SERVER['HTTP_AUTHORIZATION'] : $_SERVER['REDIRECT_HTTP_AUTHORIZATION'];

        // Test to make sure the pattern matches expected.
        if ( ! preg_match( '%^Basic [a-z\d/+]*={0,2}$%i', $header ) ) {
                return;
        }

        // Removing `Basic ` the token would start six characters in.
        $token    = substr( $header, 6 );
        $userpass = base64_decode( $token );

        list( $user, $pass ) = explode( ':', $userpass );

        // Now shove them in the proper keys where we're expecting later on.
        $_SERVER['PHP_AUTH_USER'] = $user;
        $_SERVER['PHP_AUTH_PW']   = $pass;
}

/**
 * Check for the required PHP version, and the MySQL extension or
 * a database drop-in.
 *
 * Dies if requirements are not met.
 *
 * @since 3.0.0
 * @access private
 *
 * @global string $required_php_version The required PHP version string.
 * @global string $wp_version           The WordPress version string.
 */
function wp_check_php_mysql_versions() {
        global $required_php_version, $wp_version;
        $php_version = PHP_VERSION;

        if ( version_compare( $required_php_version, $php_version, '>' ) ) {
                $protocol = wp_get_server_protocol();
                header( sprintf( '%s 500 Internal Server Error', $protocol ), true, 500 );
                header( 'Content-Type: text/html; charset=utf-8' );
                printf( 'Your server is running PHP version %1$s but WordPress %2$s requires at least %3$s.', $php_version, $wp_version, $required_php_version );
                exit( 1 );
        }

        if ( ! extension_loaded( 'mysql' ) && ! extension_loaded( 'mysqli' ) && ! extension_loaded( 'mysqlnd' )
                // This runs before default constants are defined, so we can't assume WP_CONTENT_DIR is set yet.
                && ( defined( 'WP_CONTENT_DIR' ) && ! file_exists( WP_CONTENT_DIR . '/db.php' )
                        || ! file_exists( ABSPATH . 'wp-content/db.php' ) )
        ) {
                require_once ABSPATH . WPINC . '/functions.php';
                wp_load_translations_early();
                $args = array(
                        'exit' => false,
                        'code' => 'mysql_not_found',
                );
                wp_die(
                        __( 'Your PHP installation appears to be missing the MySQL extension which is required by WordPress.' ),
                        __( 'Requirements Not Met' ),
                        $args
                );
                exit( 1 );
        }
}

/**
 * Retrieves the current environment type.
 *
 * The type can be set via the `WP_ENVIRONMENT_TYPE` global system variable,
 * or a constant of the same name.
 *
 * Possible values are 'local', 'development', 'staging', and 'production'.
 * If not set, the type defaults to 'production'.
 *
 * @since 5.5.0
 * @since 5.5.1 Added the 'local' type.
 * @since 5.5.1 Removed the ability to alter the list of types.
 *
 * @return string The current environment type.
 */
function wp_get_environment_type() {
        static $current_env = '';

        if ( ! defined( 'WP_RUN_CORE_TESTS' ) && $current_env ) {
                return $current_env;
        }

        $wp_environments = array(
                'local',
                'development',
                'staging',
                'production',
        );

        // Add a note about the deprecated WP_ENVIRONMENT_TYPES constant.
        if ( defined( 'WP_ENVIRONMENT_TYPES' ) && function_exists( '_deprecated_argument' ) ) {
                if ( function_exists( '__' ) ) {
                        /* translators: %s: WP_ENVIRONMENT_TYPES */
                        $message = sprintf( __( 'The %s constant is no longer supported.' ), 'WP_ENVIRONMENT_TYPES' );
                } else {
                        $message = sprintf( 'The %s constant is no longer supported.', 'WP_ENVIRONMENT_TYPES' );
                }

                _deprecated_argument(
                        'define()',
                        '5.5.1',
                        $message
                );
        }

        // Check if the environment variable has been set, if `getenv` is available on the system.
        if ( function_exists( 'getenv' ) ) {
                $has_env = getenv( 'WP_ENVIRONMENT_TYPE' );
                if ( false !== $has_env ) {
                        $current_env = $has_env;
                }
        }

        // Fetch the environment from a constant, this overrides the global system variable.
        if ( defined( 'WP_ENVIRONMENT_TYPE' ) && WP_ENVIRONMENT_TYPE ) {
                $current_env = WP_ENVIRONMENT_TYPE;
        }

        // Make sure the environment is an allowed one, and not accidentally set to an invalid value.
        if ( ! in_array( $current_env, $wp_environments, true ) ) {
                $current_env = 'production';
        }

        return $current_env;
}

/**
 * Don't load all of WordPress when handling a favicon.ico request.
 *
 * Instead, send the headers for a zero-length favicon and bail.
 *
 * @since 3.0.0
 * @deprecated 5.4.0 Deprecated in favor of do_favicon().
 */
function wp_favicon_request() {
        if ( '/favicon.ico' === $_SERVER['REQUEST_URI'] ) {
                header( 'Content-Type: image/vnd.microsoft.icon' );
                exit;
        }
}

/**
 * Die with a maintenance message when conditions are met.
 *
 * The default message can be replaced by using a drop-in (maintenance.php in
 * the wp-content directory).
 *
 * @since 3.0.0
 * @access private
 */
function wp_maintenance() {
        // Return if maintenance mode is disabled.
        if ( ! wp_is_maintenance_mode() ) {
                return;
        }

        if ( file_exists( WP_CONTENT_DIR . '/maintenance.php' ) ) {
                require_once WP_CONTENT_DIR . '/maintenance.php';
                die();
        }

        require_once ABSPATH . WPINC . '/functions.php';
        wp_load_translations_early();

        header( 'Retry-After: 600' );

        wp_die(
                __( 'Briefly unavailable for scheduled maintenance. Check back in a minute.' ),
                __( 'Maintenance' ),
                503
        );
}

/**
 * Check if maintenance mode is enabled.
 *
 * Checks for a file in the WordPress root directory named ".maintenance".
 * This file will contain the variable $upgrading, set to the time the file
 * was created. If the file was created less than 10 minutes ago, WordPress
 * is in maintenance mode.
 *
 * @since 5.5.0
 *
 * @global int $upgrading The Unix timestamp marking when upgrading WordPress began.
 *
 * @return bool True if maintenance mode is enabled, false otherwise.
 */
function wp_is_maintenance_mode() {
        global $upgrading;

        if ( ! file_exists( ABSPATH . '.maintenance' ) || wp_installing() ) {
                return false;
        }

        require ABSPATH . '.maintenance';
        // If the $upgrading timestamp is older than 10 minutes, consider maintenance over.
        if ( ( time() - $upgrading ) >= 10 * MINUTE_IN_SECONDS ) {
                return false;
        }

        /**
         * Filters whether to enable maintenance mode.
         *
         * This filter runs before it can be used by plugins. It is designed for
         * non-web runtimes. If this filter returns true, maintenance mode will be
         * active and the request will end. If false, the request will be allowed to
         * continue processing even if maintenance mode should be active.
         *
         * @since 4.6.0
         *
         * @param bool $enable_checks Whether to enable maintenance mode. Default true.
         * @param int  $upgrading     The timestamp set in the .maintenance file.
         */
        if ( ! apply_filters( 'enable_maintenance_mode', true, $upgrading ) ) {
                return false;
        }

        return true;
}

/**
 * Get the time elapsed so far during this PHP script.
 *
 * Uses REQUEST_TIME_FLOAT that appeared in PHP 5.4.0.
 *
 * @since 5.8.0
 *
 * @return float Seconds since the PHP script started.
 */
function timer_float() {
        return microtime( true ) - $_SERVER['REQUEST_TIME_FLOAT'];
}

/**
 * Start the WordPress micro-timer.
 *
 * @since 0.71
 * @access private
 *
 * @global float $timestart Unix timestamp set at the beginning of the page load.
 * @see timer_stop()
 *
 * @return bool Always returns true.
 */
function timer_start() {
        global $timestart;
        $timestart = microtime( true );
        return true;
}

/**
 * Retrieve or display the time from the page start to when function is called.
 *
 * @since 0.71
 *
 * @global float   $timestart Seconds from when timer_start() is called.
 * @global float   $timeend   Seconds from when function is called.
 *
 * @param int|bool $display   Whether to echo or return the results. Accepts 0|false for return,
 *                            1|true for echo. Default 0|false.
 * @param int      $precision The number of digits from the right of the decimal to display.
 *                            Default 3.
 * @return string The "second.microsecond" finished time calculation. The number is formatted
 *                for human consumption, both localized and rounded.
 */
function timer_stop( $display = 0, $precision = 3 ) {
        global $timestart, $timeend;
        $timeend   = microtime( true );
        $timetotal = $timeend - $timestart;
        $r         = ( function_exists( 'number_format_i18n' ) ) ? number_format_i18n( $timetotal, $precision ) : number_format( $timetotal, $precision );
        if ( $display ) {
                echo $r;
        }
        return $r;
}

/**
 * Set PHP error reporting based on WordPress debug settings.
 *
 * Uses three constants: `WP_DEBUG`, `WP_DEBUG_DISPLAY`, and `WP_DEBUG_LOG`.
 * All three can be defined in wp-config.php. By default, `WP_DEBUG` and
 * `WP_DEBUG_LOG` are set to false, and `WP_DEBUG_DISPLAY` is set to true.
 *
 * When `WP_DEBUG` is true, all PHP notices are reported. WordPress will also
 * display internal notices: when a deprecated WordPress function, function
 * argument, or file is used. Deprecated code may be removed from a later
 * version.
 *
 * It is strongly recommended that plugin and theme developers use `WP_DEBUG`
 * in their development environments.
 *
 * `WP_DEBUG_DISPLAY` and `WP_DEBUG_LOG` perform no function unless `WP_DEBUG`
 * is true.
 *
 * When `WP_DEBUG_DISPLAY` is true, WordPress will force errors to be displayed.
 * `WP_DEBUG_DISPLAY` defaults to true. Defining it as null prevents WordPress
 * from changing the global configuration setting. Defining `WP_DEBUG_DISPLAY`
 * as false will force errors to be hidden.
 *
 * When `WP_DEBUG_LOG` is true, errors will be logged to `wp-content/debug.log`.
 * When `WP_DEBUG_LOG` is a valid path, errors will be logged to the specified file.
 *
 * Errors are never displayed for XML-RPC, REST, `ms-files.php`, and Ajax requests.
 *
 * @since 3.0.0
 * @since 5.1.0 `WP_DEBUG_LOG` can be a file path.
 * @access private
 */
function wp_debug_mode() {
        /**
         * Filters whether to allow the debug mode check to occur.
         *
         * This filter runs before it can be used by plugins. It is designed for
         * non-web runtimes. Returning false causes the `WP_DEBUG` and related
         * constants to not be checked and the default PHP values for errors
         * will be used unless you take care to update them yourself.
         *
         * To use this filter you must define a `$wp_filter` global before
         * WordPress loads, usually in `wp-config.php`.
         *
         * Example:
         *
         *     $GLOBALS['wp_filter'] = array(
         *         'enable_wp_debug_mode_checks' => array(
         *             10 => array(
         *                 array(
         *                     'accepted_args' => 0,
         *                     'function'      => function() {
         *                         return false;
         *                     },
         *                 ),
         *             ),
         *         ),
         *     );
         *
         * @since 4.6.0
         *
         * @param bool $enable_debug_mode Whether to enable debug mode checks to occur. Default true.
         */
        if ( ! apply_filters( 'enable_wp_debug_mode_checks', true ) ) {
                return;
        }

        if ( WP_DEBUG ) {
                error_reporting( E_ALL );

                if ( WP_DEBUG_DISPLAY ) {
                        ini_set( 'display_errors', 1 );
                } elseif ( null !== WP_DEBUG_DISPLAY ) {
                        ini_set( 'display_errors', 0 );
                }

                if ( in_array( strtolower( (string) WP_DEBUG_LOG ), array( 'true', '1' ), true ) ) {
                        $log_path = WP_CONTENT_DIR . '/debug.log';
                } elseif ( is_string( WP_DEBUG_LOG ) ) {
                        $log_path = WP_DEBUG_LOG;
                } else {
                        $log_path = false;
                }

                if ( $log_path ) {
                        ini_set( 'log_errors', 1 );
                        ini_set( 'error_log', $log_path );
                }
        } else {
                error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );
        }

        if (
                defined( 'XMLRPC_REQUEST' ) || defined( 'REST_REQUEST' ) || defined( 'MS_FILES_REQUEST' ) ||
                ( defined( 'WP_INSTALLING' ) && WP_INSTALLING ) ||
                wp_doing_ajax() || wp_is_json_request() ) {

                if ( WP_DEBUG &&  WP_DEBUG_DISPLAY ) {
                        ini_set( 'display_errors', 1 );                 
                }
                else{
                        ini_set( 'display_errors', 0 );
                }
        }
}

/**
 * Set the location of the language directory.
 *
 * To set directory manually, define the `WP_LANG_DIR` constant
 * in wp-config.php.
 *
 * If the language directory exists within `WP_CONTENT_DIR`, it
 * is used. Otherwise the language directory is assumed to live
 * in `WPINC`.
 *
 * @since 3.0.0
 * @access private
 */
function wp_set_lang_dir() {
        if ( ! defined( 'WP_LANG_DIR' ) ) {
                if ( file_exists( WP_CONTENT_DIR . '/languages' ) && @is_dir( WP_CONTENT_DIR . '/languages' ) || ! @is_dir( ABSPATH . WPINC . '/languages' ) ) {
                        /**
                         * Server path of the language directory.
                         *
                         * No leading slash, no trailing slash, full path, not relative to ABSPATH
                         *
                         * @since 2.1.0
                         */
                        define( 'WP_LANG_DIR', WP_CONTENT_DIR . '/languages' );
                        if ( ! defined( 'LANGDIR' ) ) {
                                // Old static relative path maintained for limited backward compatibility - won't work in some cases.
                                define( 'LANGDIR', 'wp-content/languages' );
                        }
                } else {
                        /**
                         * Server path of the language directory.
                         *
                         * No leading slash, no trailing slash, full path, not relative to `ABSPATH`.
                         *
                         * @since 2.1.0
                         */
                        define( 'WP_LANG_DIR', ABSPATH . WPINC . '/languages' );
                        if ( ! defined( 'LANGDIR' ) ) {
                                // Old relative path maintained for backward compatibility.
                                define( 'LANGDIR', WPINC . '/languages' );
                        }
                }
        }
}

/**
 * Load the database class file and instantiate the `$wpdb` global.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 */
function require_wp_db() {
        global $wpdb;

        require_once ABSPATH . WPINC . '/class-wpdb.php';

        if ( file_exists( WP_CONTENT_DIR . '/db.php' ) ) {
                require_once WP_CONTENT_DIR . '/db.php';
        }

        if ( isset( $wpdb ) ) {
                return;
        }

        $dbuser     = defined( 'DB_USER' ) ? DB_USER : '';
        $dbpassword = defined( 'DB_PASSWORD' ) ? DB_PASSWORD : '';
        $dbname     = defined( 'DB_NAME' ) ? DB_NAME : '';
        $dbhost     = defined( 'DB_HOST' ) ? DB_HOST : '';

        $wpdb = new wpdb( $dbuser, $dbpassword, $dbname, $dbhost );
}

/**
 * Set the database table prefix and the format specifiers for database
 * table columns.
 *
 * Columns not listed here default to `%s`.
 *
 * @since 3.0.0
 * @access private
 *
 * @global wpdb   $wpdb         WordPress database abstraction object.
 * @global string $table_prefix The database table prefix.
 */
function wp_set_wpdb_vars() {
        global $wpdb, $table_prefix;
        if ( ! empty( $wpdb->error ) ) {
                dead_db();
        }

        $wpdb->field_types = array(
                'post_author'      => '%d',
                'post_parent'      => '%d',
                'menu_order'       => '%d',
                'term_id'          => '%d',
                'term_group'       => '%d',
                'term_taxonomy_id' => '%d',
                'parent'           => '%d',
                'count'            => '%d',
                'object_id'        => '%d',
                'term_order'       => '%d',
                'ID'               => '%d',
                'comment_ID'       => '%d',
                'comment_post_ID'  => '%d',
                'comment_parent'   => '%d',
                'user_id'          => '%d',
                'link_id'          => '%d',
                'link_owner'       => '%d',
                'link_rating'      => '%d',
                'option_id'        => '%d',
                'blog_id'          => '%d',
                'meta_id'          => '%d',
                'post_id'          => '%d',
                'user_status'      => '%d',
                'umeta_id'         => '%d',
                'comment_karma'    => '%d',
                'comment_count'    => '%d',
                // Multisite:
                'active'           => '%d',
                'cat_id'           => '%d',
                'deleted'          => '%d',
                'lang_id'          => '%d',
                'mature'           => '%d',
                'public'           => '%d',
                'site_id'          => '%d',
                'spam'             => '%d',
        );

        $prefix = $wpdb->set_prefix( $table_prefix );

        if ( is_wp_error( $prefix ) ) {
                wp_load_translations_early();
                wp_die(
                        sprintf(
                                /* translators: 1: $table_prefix, 2: wp-config.php */
                                __( '<strong>Error:</strong> %1$s in %2$s can only contain numbers, letters, and underscores.' ),
                                '<code>$table_prefix</code>',
                                '<code>wp-config.php</code>'
                        )
                );
        }
}

/**
 * Toggle `$_wp_using_ext_object_cache` on and off without directly
 * touching global.
 *
 * @since 3.7.0
 *
 * @global bool $_wp_using_ext_object_cache
 *
 * @param bool $using Whether external object cache is being used.
 * @return bool The current 'using' setting.
 */
function wp_using_ext_object_cache( $using = null ) {
        global $_wp_using_ext_object_cache;
        $current_using = $_wp_using_ext_object_cache;
        if ( null !== $using ) {
                $_wp_using_ext_object_cache = $using;
        }
        return $current_using;
}

/**
 * Start the WordPress object cache.
 *
 * If an object-cache.php file exists in the wp-content directory,
 * it uses that drop-in as an external object cache.
 *
 * @since 3.0.0
 * @access private
 *
 * @global array $wp_filter Stores all of the filters.
 */
function wp_start_object_cache() {
        global $wp_filter;
        static $first_init = true;

        // Only perform the following checks once.

        /**
         * Filters whether to enable loading of the object-cache.php drop-in.
         *
         * This filter runs before it can be used by plugins. It is designed for non-web
         * runtimes. If false is returned, object-cache.php will never be loaded.
         *
         * @since 5.8.0
         *
         * @param bool $enable_object_cache Whether to enable loading object-cache.php (if present).
         *                                  Default true.
         */
        if ( $first_init && apply_filters( 'enable_loading_object_cache_dropin', true ) ) {
                if ( ! function_exists( 'wp_cache_init' ) ) {
                        /*
                         * This is the normal situation. First-run of this function. No
                         * caching backend has been loaded.
                         *
                         * We try to load a custom caching backend, and then, if it
                         * results in a wp_cache_init() function existing, we note
                         * that an external object cache is being used.
                         */
                        if ( file_exists( WP_CONTENT_DIR . '/object-cache.php' ) ) {
                                require_once WP_CONTENT_DIR . '/object-cache.php';
                                if ( function_exists( 'wp_cache_init' ) ) {
                                        wp_using_ext_object_cache( true );
                                }

                                // Re-initialize any hooks added manually by object-cache.php.
                                if ( $wp_filter ) {
                                        $wp_filter = WP_Hook::build_preinitialized_hooks( $wp_filter );
                                }
                        }
                } elseif ( ! wp_using_ext_object_cache() && file_exists( WP_CONTENT_DIR . '/object-cache.php' ) ) {
                        /*
                         * Sometimes advanced-cache.php can load object-cache.php before
                         * this function is run. This breaks the function_exists() check
                         * above and can result in wp_using_ext_object_cache() returning
                         * false when actually an external cache is in use.
                         */
                        wp_using_ext_object_cache( true );
                }
        }

        if ( ! wp_using_ext_object_cache() ) {
                require_once ABSPATH . WPINC . '/cache.php';
        }

        require_once ABSPATH . WPINC . '/cache-compat.php';

        /*
         * If cache supports reset, reset instead of init if already
         * initialized. Reset signals to the cache that global IDs
         * have changed and it may need to update keys and cleanup caches.
         */
        if ( ! $first_init && function_exists( 'wp_cache_switch_to_blog' ) ) {
                wp_cache_switch_to_blog( get_current_blog_id() );
        } elseif ( function_exists( 'wp_cache_init' ) ) {
                wp_cache_init();
        }

        if ( function_exists( 'wp_cache_add_global_groups' ) ) {
                wp_cache_add_global_groups(
                        array(
                                'blog-details',
                                'blog-id-cache',
                                'blog-lookup',
                                'blog_meta',
                                'global-posts',
                                'networks',
                                'sites',
                                'site-details',
                                'site-options',
                                'site-transient',
                                'rss',
                                'users',
                                'useremail',
                                'userlogins',
                                'usermeta',
                                'user_meta',
                                'userslugs',
                        )
                );

                wp_cache_add_non_persistent_groups( array( 'counts', 'plugins' ) );
        }

        $first_init = false;
}

/**
 * Redirect to the installer if WordPress is not installed.
 *
 * Dies with an error message when Multisite is enabled.
 *
 * @since 3.0.0
 * @access private
 */
function wp_not_installed() {
        if ( is_blog_installed() || wp_installing() ) {
                return;
        }

        nocache_headers();

        if ( is_multisite() ) {
                wp_die( __( 'The site you have requested is not installed properly. Please contact the system administrator.' ) );
        }

        require ABSPATH . WPINC . '/kses.php';
        require ABSPATH . WPINC . '/pluggable.php';

        $link = wp_guess_url() . '/wp-admin/install.php';

        wp_redirect( $link );
        die();
}

/**
 * Retrieve an array of must-use plugin files.
 *
 * The default directory is wp-content/mu-plugins. To change the default
 * directory manually, define `WPMU_PLUGIN_DIR` and `WPMU_PLUGIN_URL`
 * in wp-config.php.
 *
 * @since 3.0.0
 * @access private
 *
 * @return string[] Array of absolute paths of files to include.
 */
function wp_get_mu_plugins() {
        $mu_plugins = array();
        if ( ! is_dir( WPMU_PLUGIN_DIR ) ) {
                return $mu_plugins;
        }
        $dh = opendir( WPMU_PLUGIN_DIR );
        if ( ! $dh ) {
                return $mu_plugins;
        }
        while ( ( $plugin = readdir( $dh ) ) !== false ) {
                if ( '.php' === substr( $plugin, -4 ) ) {
                        $mu_plugins[] = WPMU_PLUGIN_DIR . '/' . $plugin;
                }
        }
        closedir( $dh );
        sort( $mu_plugins );

        return $mu_plugins;
}

/**
 * Retrieve an array of active and valid plugin files.
 *
 * While upgrading or installing WordPress, no plugins are returned.
 *
 * The default directory is `wp-content/plugins`. To change the default
 * directory manually, define `WP_PLUGIN_DIR` and `WP_PLUGIN_URL`
 * in `wp-config.php`.
 *
 * @since 3.0.0
 * @access private
 *
 * @return string[] Array of paths to plugin files relative to the plugins directory.
 */
function wp_get_active_and_valid_plugins() {
        $plugins        = array();
        $active_plugins = (array) get_option( 'active_plugins', array() );

        // Check for hacks file if the option is enabled.
        if ( get_option( 'hack_file' ) && file_exists( ABSPATH . 'my-hacks.php' ) ) {
                _deprecated_file( 'my-hacks.php', '1.5.0' );
                array_unshift( $plugins, ABSPATH . 'my-hacks.php' );
        }

        if ( empty( $active_plugins ) || wp_installing() ) {
                return $plugins;
        }

        $network_plugins = is_multisite() ? wp_get_active_network_plugins() : false;

        foreach ( $active_plugins as $plugin ) {
                if ( ! validate_file( $plugin )                     // $plugin must validate as file.
                        && '.php' === substr( $plugin, -4 )             // $plugin must end with '.php'.
                        && file_exists( WP_PLUGIN_DIR . '/' . $plugin ) // $plugin must exist.
                        // Not already included as a network plugin.
                        && ( ! $network_plugins || ! in_array( WP_PLUGIN_DIR . '/' . $plugin, $network_plugins, true ) )
                        ) {
                        $plugins[] = WP_PLUGIN_DIR . '/' . $plugin;
                }
        }

        /*
         * Remove plugins from the list of active plugins when we're on an endpoint
         * that should be protected against WSODs and the plugin is paused.
         */
        if ( wp_is_recovery_mode() ) {
                $plugins = wp_skip_paused_plugins( $plugins );
        }

        return $plugins;
}

/**
 * Filters a given list of plugins, removing any paused plugins from it.
 *
 * @since 5.2.0
 *
 * @param string[] $plugins Array of absolute plugin main file paths.
 * @return string[] Filtered array of plugins, without any paused plugins.
 */
function wp_skip_paused_plugins( array $plugins ) {
        $paused_plugins = wp_paused_plugins()->get_all();

        if ( empty( $paused_plugins ) ) {
                return $plugins;
        }

        foreach ( $plugins as $index => $plugin ) {
                list( $plugin ) = explode( '/', plugin_basename( $plugin ) );

                if ( array_key_exists( $plugin, $paused_plugins ) ) {
                        unset( $plugins[ $index ] );

                        // Store list of paused plugins for displaying an admin notice.
                        $GLOBALS['_paused_plugins'][ $plugin ] = $paused_plugins[ $plugin ];
                }
        }

        return $plugins;
}

/**
 * Retrieves an array of active and valid themes.
 *
 * While upgrading or installing WordPress, no themes are returned.
 *
 * @since 5.1.0
 * @access private
 *
 * @global string $pagenow The filename of the current screen.
 *
 * @return string[] Array of absolute paths to theme directories.
 */
function wp_get_active_and_valid_themes() {
        global $pagenow;

        $themes = array();

        if ( wp_installing() && 'wp-activate.php' !== $pagenow ) {
                return $themes;
        }

        if ( TEMPLATEPATH !== STYLESHEETPATH ) {
                $themes[] = STYLESHEETPATH;
        }

        $themes[] = TEMPLATEPATH;

        /*
         * Remove themes from the list of active themes when we're on an endpoint
         * that should be protected against WSODs and the theme is paused.
         */
        if ( wp_is_recovery_mode() ) {
                $themes = wp_skip_paused_themes( $themes );

                // If no active and valid themes exist, skip loading themes.
                if ( empty( $themes ) ) {
                        add_filter( 'wp_using_themes', '__return_false' );
                }
        }

        return $themes;
}

/**
 * Filters a given list of themes, removing any paused themes from it.
 *
 * @since 5.2.0
 *
 * @param string[] $themes Array of absolute theme directory paths.
 * @return string[] Filtered array of absolute paths to themes, without any paused themes.
 */
function wp_skip_paused_themes( array $themes ) {
        $paused_themes = wp_paused_themes()->get_all();

        if ( empty( $paused_themes ) ) {
                return $themes;
        }

        foreach ( $themes as $index => $theme ) {
                $theme = basename( $theme );

                if ( array_key_exists( $theme, $paused_themes ) ) {
                        unset( $themes[ $index ] );

                        // Store list of paused themes for displaying an admin notice.
                        $GLOBALS['_paused_themes'][ $theme ] = $paused_themes[ $theme ];
                }
        }

        return $themes;
}

/**
 * Is WordPress in Recovery Mode.
 *
 * In this mode, plugins or themes that cause WSODs will be paused.
 *
 * @since 5.2.0
 *
 * @return bool
 */
function wp_is_recovery_mode() {
        return wp_recovery_mode()->is_active();
}

/**
 * Determines whether we are currently on an endpoint that should be protected against WSODs.
 *
 * @since 5.2.0
 *
 * @global string $pagenow The filename of the current screen.
 *
 * @return bool True if the current endpoint should be protected.
 */
function is_protected_endpoint() {
        // Protect login pages.
        if ( isset( $GLOBALS['pagenow'] ) && 'wp-login.php' === $GLOBALS['pagenow'] ) {
                return true;
        }

        // Protect the admin backend.
        if ( is_admin() && ! wp_doing_ajax() ) {
                return true;
        }

        // Protect Ajax actions that could help resolve a fatal error should be available.
        if ( is_protected_ajax_action() ) {
                return true;
        }

        /**
         * Filters whether the current request is against a protected endpoint.
         *
         * This filter is only fired when an endpoint is requested which is not already protected by
         * WordPress core. As such, it exclusively allows providing further protected endpoints in
         * addition to the admin backend, login pages and protected Ajax actions.
         *
         * @since 5.2.0
         *
         * @param bool $is_protected_endpoint Whether the currently requested endpoint is protected.
         *                                    Default false.
         */
        return (bool) apply_filters( 'is_protected_endpoint', false );
}

/**
 * Determines whether we are currently handling an Ajax action that should be protected against WSODs.
 *
 * @since 5.2.0
 *
 * @return bool True if the current Ajax action should be protected.
 */
function is_protected_ajax_action() {
        if ( ! wp_doing_ajax() ) {
                return false;
        }

        if ( ! isset( $_REQUEST['action'] ) ) {
                return false;
        }

        $actions_to_protect = array(
                'edit-theme-plugin-file', // Saving changes in the core code editor.
                'heartbeat',              // Keep the heart beating.
                'install-plugin',         // Installing a new plugin.
                'install-theme',          // Installing a new theme.
                'search-plugins',         // Searching in the list of plugins.
                'search-install-plugins', // Searching for a plugin in the plugin install screen.
                'update-plugin',          // Update an existing plugin.
                'update-theme',           // Update an existing theme.
        );

        /**
         * Filters the array of protected Ajax actions.
         *
         * This filter is only fired when doing Ajax and the Ajax request has an 'action' property.
         *
         * @since 5.2.0
         *
         * @param string[] $actions_to_protect Array of strings with Ajax actions to protect.
         */
        $actions_to_protect = (array) apply_filters( 'wp_protected_ajax_actions', $actions_to_protect );

        if ( ! in_array( $_REQUEST['action'], $actions_to_protect, true ) ) {
                return false;
        }

        return true;
}

/**
 * Set internal encoding.
 *
 * In most cases the default internal encoding is latin1, which is
 * of no use, since we want to use the `mb_` functions for `utf-8` strings.
 *
 * @since 3.0.0
 * @access private
 */
function wp_set_internal_encoding() {
        if ( function_exists( 'mb_internal_encoding' ) ) {
                $charset = get_option( 'blog_charset' );
                // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
                if ( ! $charset || ! @mb_internal_encoding( $charset ) ) {
                        mb_internal_encoding( 'UTF-8' );
                }
        }
}

/**
 * Add magic quotes to `$_GET`, `$_POST`, `$_COOKIE`, and `$_SERVER`.
 *
 * Also forces `$_REQUEST` to be `$_GET + $_POST`. If `$_SERVER`,
 * `$_COOKIE`, or `$_ENV` are needed, use those superglobals directly.
 *
 * @since 3.0.0
 * @access private
 */
function wp_magic_quotes() {
        // Escape with wpdb.
        $_GET    = add_magic_quotes( $_GET );
        $_POST   = add_magic_quotes( $_POST );
        $_COOKIE = add_magic_quotes( $_COOKIE );
        $_SERVER = add_magic_quotes( $_SERVER );

        // Force REQUEST to be GET + POST.
        $_REQUEST = array_merge( $_GET, $_POST );
}

/**
 * Runs just before PHP shuts down execution.
 *
 * @since 1.2.0
 * @access private
 */
function shutdown_action_hook() {
        /**
         * Fires just before PHP shuts down execution.
         *
         * @since 1.2.0
         */
        do_action( 'shutdown' );

        wp_cache_close();
}

/**
 * Copy an object.
 *
 * @since 2.7.0
 * @deprecated 3.2.0
 *
 * @param object $input_object The object to clone.
 * @return object The cloned object.
 */
function wp_clone( $input_object ) {
        // Use parens for clone to accommodate PHP 4. See #17880.
        return clone( $input_object );
}

/**
 * Determines whether the current request is for the login screen.
 *
 * @since 6.1.0
 *
 * @see wp_login_url()
 *
 * @return bool True if inside WordPress login screen, false otherwise.
 */
function is_login() {
        return false !== stripos( wp_login_url(), $_SERVER['SCRIPT_NAME'] );
}

/**
 * Determines whether the current request is for an administrative interface page.
 *
 * Does not check if the user is an administrator; use current_user_can()
 * for checking roles and capabilities.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 1.5.1
 *
 * @global WP_Screen $current_screen WordPress current screen object.
 *
 * @return bool True if inside WordPress administration interface, false otherwise.
 */
function is_admin() {
        if ( isset( $GLOBALS['current_screen'] ) ) {
                return $GLOBALS['current_screen']->in_admin();
        } elseif ( defined( 'WP_ADMIN' ) ) {
                return WP_ADMIN;
        }

        return false;
}

/**
 * Determines whether the current request is for a site's administrative interface.
 *
 * e.g. `/wp-admin/`
 *
 * Does not check if the user is an administrator; use current_user_can()
 * for checking roles and capabilities.
 *
 * @since 3.1.0
 *
 * @global WP_Screen $current_screen WordPress current screen object.
 *
 * @return bool True if inside WordPress site administration pages.
 */
function is_blog_admin() {
        if ( isset( $GLOBALS['current_screen'] ) ) {
                return $GLOBALS['current_screen']->in_admin( 'site' );
        } elseif ( defined( 'WP_BLOG_ADMIN' ) ) {
                return WP_BLOG_ADMIN;
        }

        return false;
}

/**
 * Determines whether the current request is for the network administrative interface.
 *
 * e.g. `/wp-admin/network/`
 *
 * Does not check if the user is an administrator; use current_user_can()
 * for checking roles and capabilities.
 *
 * Does not check if the site is a Multisite network; use is_multisite()
 * for checking if Multisite is enabled.
 *
 * @since 3.1.0
 *
 * @global WP_Screen $current_screen WordPress current screen object.
 *
 * @return bool True if inside WordPress network administration pages.
 */
function is_network_admin() {
        if ( isset( $GLOBALS['current_screen'] ) ) {
                return $GLOBALS['current_screen']->in_admin( 'network' );
        } elseif ( defined( 'WP_NETWORK_ADMIN' ) ) {
                return WP_NETWORK_ADMIN;
        }

        return false;
}

/**
 * Determines whether the current request is for a user admin screen.
 *
 * e.g. `/wp-admin/user/`
 *
 * Does not check if the user is an administrator; use current_user_can()
 * for checking roles and capabilities.
 *
 * @since 3.1.0
 *
 * @global WP_Screen $current_screen WordPress current screen object.
 *
 * @return bool True if inside WordPress user administration pages.
 */
function is_user_admin() {
        if ( isset( $GLOBALS['current_screen'] ) ) {
                return $GLOBALS['current_screen']->in_admin( 'user' );
        } elseif ( defined( 'WP_USER_ADMIN' ) ) {
                return WP_USER_ADMIN;
        }

        return false;
}

/**
 * If Multisite is enabled.
 *
 * @since 3.0.0
 *
 * @return bool True if Multisite is enabled, false otherwise.
 */
function is_multisite() {
        if ( defined( 'MULTISITE' ) ) {
                return MULTISITE;
        }

        if ( defined( 'SUBDOMAIN_INSTALL' ) || defined( 'VHOST' ) || defined( 'SUNRISE' ) ) {
                return true;
        }

        return false;
}

/**
 * Retrieve the current site ID.
 *
 * @since 3.1.0
 *
 * @global int $blog_id
 *
 * @return int Site ID.
 */
function get_current_blog_id() {
        global $blog_id;
        return absint( $blog_id );
}

/**
 * Retrieves the current network ID.
 *
 * @since 4.6.0
 *
 * @return int The ID of the current network.
 */
function get_current_network_id() {
        if ( ! is_multisite() ) {
                return 1;
        }

        $current_network = get_network();

        if ( ! isset( $current_network->id ) ) {
                return get_main_network_id();
        }

        return absint( $current_network->id );
}

/**
 * Attempt an early load of translations.
 *
 * Used for errors encountered during the initial loading process, before
 * the locale has been properly detected and loaded.
 *
 * Designed for unusual load sequences (like setup-config.php) or for when
 * the script will then terminate with an error, otherwise there is a risk
 * that a file can be double-included.
 *
 * @since 3.4.0
 * @access private
 *
 * @global WP_Textdomain_Registry $wp_textdomain_registry WordPress Textdomain Registry.
 * @global WP_Locale              $wp_locale              WordPress date and time locale object.
 */
function wp_load_translations_early() {
        global $wp_textdomain_registry, $wp_locale;

        static $loaded = false;
        if ( $loaded ) {
                return;
        }
        $loaded = true;

        if ( function_exists( 'did_action' ) && did_action( 'init' ) ) {
                return;
        }

        // We need $wp_local_package.
        require ABSPATH . WPINC . '/version.php';

        // Translation and localization.
        require_once ABSPATH . WPINC . '/pomo/mo.php';
        require_once ABSPATH . WPINC . '/l10n.php';
        require_once ABSPATH . WPINC . '/class-wp-textdomain-registry.php';
        require_once ABSPATH . WPINC . '/class-wp-locale.php';
        require_once ABSPATH . WPINC . '/class-wp-locale-switcher.php';

        // General libraries.
        require_once ABSPATH . WPINC . '/plugin.php';

        $locales   = array();
        $locations = array();

        if ( ! $wp_textdomain_registry instanceof WP_Textdomain_Registry ) {
                $wp_textdomain_registry = new WP_Textdomain_Registry();
        }

        while ( true ) {
                if ( defined( 'WPLANG' ) ) {
                        if ( '' === WPLANG ) {
                                break;
                        }
                        $locales[] = WPLANG;
                }

                if ( isset( $wp_local_package ) ) {
                        $locales[] = $wp_local_package;
                }

                if ( ! $locales ) {
                        break;
                }

                if ( defined( 'WP_LANG_DIR' ) && @is_dir( WP_LANG_DIR ) ) {
                        $locations[] = WP_LANG_DIR;
                }

                if ( defined( 'WP_CONTENT_DIR' ) && @is_dir( WP_CONTENT_DIR . '/languages' ) ) {
                        $locations[] = WP_CONTENT_DIR . '/languages';
                }

                if ( @is_dir( ABSPATH . 'wp-content/languages' ) ) {
                        $locations[] = ABSPATH . 'wp-content/languages';
                }

                if ( @is_dir( ABSPATH . WPINC . '/languages' ) ) {
                        $locations[] = ABSPATH . WPINC . '/languages';
                }

                if ( ! $locations ) {
                        break;
                }

                $locations = array_unique( $locations );

                foreach ( $locales as $locale ) {
                        foreach ( $locations as $location ) {
                                if ( file_exists( $location . '/' . $locale . '.mo' ) ) {
                                        load_textdomain( 'default', $location . '/' . $locale . '.mo', $locale );
                                        if ( defined( 'WP_SETUP_CONFIG' ) && file_exists( $location . '/admin-' . $locale . '.mo' ) ) {
                                                load_textdomain( 'default', $location . '/admin-' . $locale . '.mo', $locale );
                                        }
                                        break 2;
                                }
                        }
                }

                break;
        }

        $wp_locale = new WP_Locale();
}

/**
 * Check or set whether WordPress is in "installation" mode.
 *
 * If the `WP_INSTALLING` constant is defined during the bootstrap, `wp_installing()` will default to `true`.
 *
 * @since 4.4.0
 *
 * @param bool $is_installing Optional. True to set WP into Installing mode, false to turn Installing mode off.
 *                            Omit this parameter if you only want to fetch the current status.
 * @return bool True if WP is installing, otherwise false. When a `$is_installing` is passed, the function will
 *              report whether WP was in installing mode prior to the change to `$is_installing`.
 */
function wp_installing( $is_installing = null ) {
        static $installing = null;

        // Support for the `WP_INSTALLING` constant, defined before WP is loaded.
        if ( is_null( $installing ) ) {
                $installing = defined( 'WP_INSTALLING' ) && WP_INSTALLING;
        }

        if ( ! is_null( $is_installing ) ) {
                $old_installing = $installing;
                $installing     = $is_installing;
                return (bool) $old_installing;
        }

        return (bool) $installing;
}

/**
 * Determines if SSL is used.
 *
 * @since 2.6.0
 * @since 4.6.0 Moved from functions.php to load.php.
 *
 * @return bool True if SSL, otherwise false.
 */
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;
}

/**
 * Converts a shorthand byte value to an integer byte value.
 *
 * @since 2.3.0
 * @since 4.6.0 Moved from media.php to load.php.
 *
 * @link https://www.php.net/manual/en/function.ini-get.php
 * @link https://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
 *
 * @param string $value A (PHP ini) byte value, either shorthand or ordinary.
 * @return int An integer byte value.
 */
function wp_convert_hr_to_bytes( $value ) {
        $value = strtolower( trim( $value ) );
        $bytes = (int) $value;

        if ( false !== strpos( $value, 'g' ) ) {
                $bytes *= GB_IN_BYTES;
        } elseif ( false !== strpos( $value, 'm' ) ) {
                $bytes *= MB_IN_BYTES;
        } elseif ( false !== strpos( $value, 'k' ) ) {
                $bytes *= KB_IN_BYTES;
        }

        // Deal with large (float) values which run into the maximum integer size.
        return min( $bytes, PHP_INT_MAX );
}

/**
 * Determines whether a PHP ini value is changeable at runtime.
 *
 * @since 4.6.0
 *
 * @link https://www.php.net/manual/en/function.ini-get-all.php
 *
 * @param string $setting The name of the ini setting to check.
 * @return bool True if the value is changeable at runtime. False otherwise.
 */
function wp_is_ini_value_changeable( $setting ) {
        static $ini_all;

        if ( ! isset( $ini_all ) ) {
                $ini_all = false;
                // Sometimes `ini_get_all()` is disabled via the `disable_functions` option for "security purposes".
                if ( function_exists( 'ini_get_all' ) ) {
                        $ini_all = ini_get_all();
                }
        }

        // Bit operator to workaround https://bugs.php.net/bug.php?id=44936 which changes access level to 63 in PHP 5.2.6 - 5.2.17.
        if ( isset( $ini_all[ $setting ]['access'] ) && ( INI_ALL === ( $ini_all[ $setting ]['access'] & 7 ) || INI_USER === ( $ini_all[ $setting ]['access'] & 7 ) ) ) {
                return true;
        }

        // If we were unable to retrieve the details, fail gracefully to assume it's changeable.
        if ( ! is_array( $ini_all ) ) {
                return true;
        }

        return false;
}

/**
 * Determines whether the current request is a WordPress Ajax request.
 *
 * @since 4.7.0
 *
 * @return bool True if it's a WordPress Ajax request, false otherwise.
 */
function wp_doing_ajax() {
        /**
         * Filters whether the current request is a WordPress Ajax request.
         *
         * @since 4.7.0
         *
         * @param bool $wp_doing_ajax Whether the current request is a WordPress Ajax request.
         */
        return apply_filters( 'wp_doing_ajax', defined( 'DOING_AJAX' ) && DOING_AJAX );
}

/**
 * Determines whether the current request should use themes.
 *
 * @since 5.1.0
 *
 * @return bool True if themes should be used, false otherwise.
 */
function wp_using_themes() {
        /**
         * Filters whether the current request should use themes.
         *
         * @since 5.1.0
         *
         * @param bool $wp_using_themes Whether the current request should use themes.
         */
        return apply_filters( 'wp_using_themes', defined( 'WP_USE_THEMES' ) && WP_USE_THEMES );
}

/**
 * Determines whether the current request is a WordPress cron request.
 *
 * @since 4.8.0
 *
 * @return bool True if it's a WordPress cron request, false otherwise.
 */
function wp_doing_cron() {
        /**
         * Filters whether the current request is a WordPress cron request.
         *
         * @since 4.8.0
         *
         * @param bool $wp_doing_cron Whether the current request is a WordPress cron request.
         */
        return apply_filters( 'wp_doing_cron', defined( 'DOING_CRON' ) && DOING_CRON );
}

/**
 * Checks whether the given variable is a WordPress Error.
 *
 * Returns whether `$thing` is an instance of the `WP_Error` class.
 *
 * @since 2.1.0
 *
 * @param mixed $thing The variable to check.
 * @return bool Whether the variable is an instance of WP_Error.
 */
function is_wp_error( $thing ) {
        $is_wp_error = ( $thing instanceof WP_Error );

        if ( $is_wp_error ) {
                /**
                 * Fires when `is_wp_error()` is called and its parameter is an instance of `WP_Error`.
                 *
                 * @since 5.6.0
                 *
                 * @param WP_Error $thing The error object passed to `is_wp_error()`.
                 */
                do_action( 'is_wp_error_instance', $thing );
        }

        return $is_wp_error;
}

/**
 * Determines whether file modifications are allowed.
 *
 * @since 4.8.0
 *
 * @param string $context The usage context.
 * @return bool True if file modification is allowed, false otherwise.
 */
function wp_is_file_mod_allowed( $context ) {
        /**
         * Filters whether file modifications are allowed.
         *
         * @since 4.8.0
         *
         * @param bool   $file_mod_allowed Whether file modifications are allowed.
         * @param string $context          The usage context.
         */
        return apply_filters( 'file_mod_allowed', ! defined( 'DISALLOW_FILE_MODS' ) || ! DISALLOW_FILE_MODS, $context );
}

/**
 * Start scraping edited file errors.
 *
 * @since 4.9.0
 */
function wp_start_scraping_edited_file_errors() {
        if ( ! isset( $_REQUEST['wp_scrape_key'] ) || ! isset( $_REQUEST['wp_scrape_nonce'] ) ) {
                return;
        }
        $key   = substr( sanitize_key( wp_unslash( $_REQUEST['wp_scrape_key'] ) ), 0, 32 );
        $nonce = wp_unslash( $_REQUEST['wp_scrape_nonce'] );

        if ( get_transient( 'scrape_key_' . $key ) !== $nonce ) {
                echo "###### wp_scraping_result_start:$key ######";
                echo wp_json_encode(
                        array(
                                'code'    => 'scrape_nonce_failure',
                                'message' => __( 'Scrape key check failed. Please try again.' ),
                        )
                );
                echo "###### wp_scraping_result_end:$key ######";
                die();
        }
        if ( ! defined( 'WP_SANDBOX_SCRAPING' ) ) {
                define( 'WP_SANDBOX_SCRAPING', true );
        }
        register_shutdown_function( 'wp_finalize_scraping_edited_file_errors', $key );
}

/**
 * Finalize scraping for edited file errors.
 *
 * @since 4.9.0
 *
 * @param string $scrape_key Scrape key.
 */
function wp_finalize_scraping_edited_file_errors( $scrape_key ) {
        $error = error_get_last();
        echo "\n###### wp_scraping_result_start:$scrape_key ######\n";
        if ( ! empty( $error ) && in_array( $error['type'], array( E_CORE_ERROR, E_COMPILE_ERROR, E_ERROR, E_PARSE, E_USER_ERROR, E_RECOVERABLE_ERROR ), true ) ) {
                $error = str_replace( ABSPATH, '', $error );
                echo wp_json_encode( $error );
        } else {
                echo wp_json_encode( true );
        }
        echo "\n###### wp_scraping_result_end:$scrape_key ######\n";
}

/**
 * Checks whether current request is a JSON request, or is expecting a JSON response.
 *
 * @since 5.0.0
 *
 * @return bool True if `Accepts` or `Content-Type` headers contain `application/json`.
 *              False otherwise.
 */
function wp_is_json_request() {

        if ( isset( $_SERVER['HTTP_ACCEPT'] ) && wp_is_json_media_type( $_SERVER['HTTP_ACCEPT'] ) ) {
                return true;
        }

        if ( isset( $_SERVER['CONTENT_TYPE'] ) && wp_is_json_media_type( $_SERVER['CONTENT_TYPE'] ) ) {
                return true;
        }

        return false;

}

/**
 * Checks whether current request is a JSONP request, or is expecting a JSONP response.
 *
 * @since 5.2.0
 *
 * @return bool True if JSONP request, false otherwise.
 */
function wp_is_jsonp_request() {
        if ( ! isset( $_GET['_jsonp'] ) ) {
                return false;
        }

        if ( ! function_exists( 'wp_check_jsonp_callback' ) ) {
                require_once ABSPATH . WPINC . '/functions.php';
        }

        $jsonp_callback = $_GET['_jsonp'];
        if ( ! wp_check_jsonp_callback( $jsonp_callback ) ) {
                return false;
        }

        /** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */
        $jsonp_enabled = apply_filters( 'rest_jsonp_enabled', true );

        return $jsonp_enabled;

}

/**
 * Checks whether a string is a valid JSON Media Type.
 *
 * @since 5.6.0
 *
 * @param string $media_type A Media Type string to check.
 * @return bool True if string is a valid JSON Media Type.
 */
function wp_is_json_media_type( $media_type ) {
        static $cache = array();

        if ( ! isset( $cache[ $media_type ] ) ) {
                $cache[ $media_type ] = (bool) preg_match( '/(^|\s|,)application\/([\w!#\$&-\^\.\+]+\+)?json(\+oembed)?($|\s|;|,)/i', $media_type );
        }

        return $cache[ $media_type ];
}

/**
 * Checks whether current request is an XML request, or is expecting an XML response.
 *
 * @since 5.2.0
 *
 * @return bool True if `Accepts` or `Content-Type` headers contain `text/xml`
 *              or one of the related MIME types. False otherwise.
 */
function wp_is_xml_request() {
        $accepted = array(
                'text/xml',
                'application/rss+xml',
                'application/atom+xml',
                'application/rdf+xml',
                'text/xml+oembed',
                'application/xml+oembed',
        );

        if ( isset( $_SERVER['HTTP_ACCEPT'] ) ) {
                foreach ( $accepted as $type ) {
                        if ( false !== strpos( $_SERVER['HTTP_ACCEPT'], $type ) ) {
                                return true;
                        }
                }
        }

        if ( isset( $_SERVER['CONTENT_TYPE'] ) && in_array( $_SERVER['CONTENT_TYPE'], $accepted, true ) ) {
                return true;
        }

        return false;
}

/**
 * Checks if this site is protected by HTTP Basic Auth.
 *
 * At the moment, this merely checks for the present of Basic Auth credentials. Therefore, calling
 * this function with a context different from the current context may give inaccurate results.
 * In a future release, this evaluation may be made more robust.
 *
 * Currently, this is only used by Application Passwords to prevent a conflict since it also utilizes
 * Basic Auth.
 *
 * @since 5.6.1
 *
 * @global string $pagenow The filename of the current screen.
 *
 * @param string $context The context to check for protection. Accepts 'login', 'admin', and 'front'.
 *                        Defaults to the current context.
 * @return bool Whether the site is protected by Basic Auth.
 */
function wp_is_site_protected_by_basic_auth( $context = '' ) {
        global $pagenow;

        if ( ! $context ) {
                if ( 'wp-login.php' === $pagenow ) {
                        $context = 'login';
                } elseif ( is_admin() ) {
                        $context = 'admin';
                } else {
                        $context = 'front';
                }
        }

        $is_protected = ! empty( $_SERVER['PHP_AUTH_USER'] ) || ! empty( $_SERVER['PHP_AUTH_PW'] );

        /**
         * Filters whether a site is protected by HTTP Basic Auth.
         *
         * @since 5.6.1
         *
         * @param bool $is_protected Whether the site is protected by Basic Auth.
         * @param string $context    The context to check for protection. One of 'login', 'admin', or 'front'.
         */
        return apply_filters( 'wp_is_site_protected_by_basic_auth', $is_protected, $context );
}