Ticket #31614: media.php

<?php
/**
 * WordPress API for media display.
 *
 * @package WordPress
 * @subpackage Media
 */

/**
 * Scale down the default size of an image.
 *
 * This is so that the image is a better fit for the editor and theme.
 *
 * The `$size` parameter accepts either an array or a string. The supported string
 * values are 'thumb' or 'thumbnail' for the given thumbnail size or defaults at
 * 128 width and 96 height in pixels. Also supported for the string value is
 * 'medium' and 'full'. The 'full' isn't actually supported, but any value other
 * than the supported will result in the content_width size or 500 if that is
 * not set.
 *
 * Finally, there is a filter named {@see 'editor_max_image_size'}, that will be
 * called on the calculated array for width and height, respectively. The second
 * parameter will be the value that was in the $size parameter. The returned
 * type for the hook is an array with the width as the first element and the
 * height as the second element.
 *
 * @since 2.5.0
 *
 * @param int          $width   Width of the image in pixels.
 * @param int          $height  Height of the image in pixels.
 * @param string|array $size    Optional. Size or array of sizes of what the result image
 *                              should be. Accepts any valid image size name. Default 'medium'.
 * @param string       $context Optional. Could be 'display' (like in a theme) or 'edit'
 *                              (like inserting into an editor). Default null.
 * @return array Width and height of what the result image should resize to.
 */
function image_constrain_size_for_editor( $width, $height, $size = 'medium', $context = null ) {
        global $content_width, $_wp_additional_image_sizes;

        if ( ! $context )
                $context = is_admin() ? 'edit' : 'display';

        if ( is_array($size) ) {
                $max_width = $size[0];
                $max_height = $size[1];
        }
        elseif ( $size == 'thumb' || $size == 'thumbnail' ) {
                $max_width = intval(get_option('thumbnail_size_w'));
                $max_height = intval(get_option('thumbnail_size_h'));
                // last chance thumbnail size defaults
                if ( !$max_width && !$max_height ) {
                        $max_width = 128;
                        $max_height = 96;
                }
        }
        elseif ( $size == 'medium' ) {
                $max_width = intval(get_option('medium_size_w'));
                $max_height = intval(get_option('medium_size_h'));
                // if no width is set, default to the theme content width if available
        }
        elseif ( $size == 'large' ) {
                // We're inserting a large size image into the editor. If it's a really
                // big image we'll scale it down to fit reasonably within the editor
                // itself, and within the theme's content width if it's known. The user
                // can resize it in the editor if they wish.
                $max_width = intval(get_option('large_size_w'));
                $max_height = intval(get_option('large_size_h'));
                if ( intval($content_width) > 0 )
                        $max_width = min( intval($content_width), $max_width );
        } elseif ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ) ) ) {
                $max_width = intval( $_wp_additional_image_sizes[$size]['width'] );
                $max_height = intval( $_wp_additional_image_sizes[$size]['height'] );
                if ( intval($content_width) > 0 && 'edit' == $context ) // Only in admin. Assume that theme authors know what they're doing.
                        $max_width = min( intval($content_width), $max_width );
        }
        // $size == 'full' has no constraint
        else {
                $max_width = $width;
                $max_height = $height;
        }

        /**
         * Filter the maximum image size dimensions for the editor.
         *
         * @since 2.5.0
         *
         * @param array        $max_image_size An array with the width as the first element,
         *                                     and the height as the second element.
         * @param string|array $size           Size of what the result image should be.
         * @param string       $context        The context the image is being resized for.
         *                                     Possible values are 'display' (like in a theme)
         *                                     or 'edit' (like inserting into an editor).
         */
        list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size, $context );

        return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
}

/**
 * Retrieve width and height attributes using given width and height values.
 *
 * Both attributes are required in the sense that both parameters must have a
 * value, but are optional in that if you set them to false or null, then they
 * will not be added to the returned string.
 *
 * You can set the value using a string, but it will only take numeric values.
 * If you wish to put 'px' after the numbers, then it will be stripped out of
 * the return.
 *
 * @since 2.5.0
 *
 * @param int|string $width Optional. Width attribute value.
 * @param int|string $height Optional. Height attribute value.
 * @return string HTML attributes for width and, or height.
 */
function image_hwstring($width, $height) {
        $out = '';
        if ($width)
                $out .= 'width="'.intval($width).'" ';
        if ($height)
                $out .= 'height="'.intval($height).'" ';
        return $out;
}

/**
 * Scale an image to fit a particular size (such as 'thumb' or 'medium').
 *
 * Array with image url, width, height, and whether is intermediate size, in
 * that order is returned on success is returned. $is_intermediate is true if
 * $url is a resized image, false if it is the original.
 *
 * The URL might be the original image, or it might be a resized version. This
 * function won't create a new resized copy, it will just return an already
 * resized one if it exists.
 *
 * A plugin may use the 'image_downsize' filter to hook into and offer image
 * resizing services for images. The hook must return an array with the same
 * elements that are returned in the function. The first element being the URL
 * to the new image that was resized.
 *
 * @since 2.5.0
 *
 * @param int $id Attachment ID for image.
 * @param array|string $size Optional, default is 'medium'. Size of image, either array or string.
 * @return bool|array False on failure, array on success.
 */
function image_downsize($id, $size = 'medium') {

        if ( !wp_attachment_is_image($id) )
                return false;

        /**
         * Filter whether to preempt the output of image_downsize().
         *
         * Passing a truthy value to the filter will effectively short-circuit
         * down-sizing the image, returning that value as output instead.
         *
         * @since 2.5.0
         *
         * @param bool         $downsize Whether to short-circuit the image downsize. Default false.
         * @param int          $id       Attachment ID for image.
         * @param array|string $size     Size of image, either array or string. Default 'medium'.
         */
        if ( $out = apply_filters( 'image_downsize', false, $id, $size ) ) {
                return $out;
        }

        $img_url = wp_get_attachment_url($id);
        $meta = wp_get_attachment_metadata($id);
        $width = $height = 0;
        $is_intermediate = false;
        $img_url_basename = wp_basename($img_url);

        // try for a new style intermediate size
        if ( $intermediate = image_get_intermediate_size($id, $size) ) {
                $img_url = str_replace($img_url_basename, $intermediate['file'], $img_url);
                $width = $intermediate['width'];
                $height = $intermediate['height'];
                $is_intermediate = true;
        }
        elseif ( $size == 'thumbnail' ) {
                // fall back to the old thumbnail
                if ( ($thumb_file = wp_get_attachment_thumb_file($id)) && $info = getimagesize($thumb_file) ) {
                        $img_url = str_replace($img_url_basename, wp_basename($thumb_file), $img_url);
                        $width = $info[0];
                        $height = $info[1];
                        $is_intermediate = true;
                }
        }
        if ( !$width && !$height && isset( $meta['width'], $meta['height'] ) ) {
                // any other type: use the real image
                $width = $meta['width'];
                $height = $meta['height'];
        }

        if ( $img_url) {
                // we have the actual image size, but might need to further constrain it if content_width is narrower
                list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );

                return array( $img_url, $width, $height, $is_intermediate );
        }
        return false;

}

/**
 * Register a new image size.
 *
 * Cropping behavior for the image size is dependent on the value of $crop:
 * 1. If false (default), images will be scaled, not cropped.
 * 2. If an array in the form of array( x_crop_position, y_crop_position ):
 *    - x_crop_position accepts 'left' 'center', or 'right'.
 *    - y_crop_position accepts 'top', 'center', or 'bottom'.
 *    Images will be cropped to the specified dimensions within the defined crop area.
 * 3. If true, images will be cropped to the specified dimensions using center positions.
 *
 * @since 2.9.0
 *
 * @global array $_wp_additional_image_sizes Associative array of additional image sizes.
 *
 * @param string     $name   Image size identifier.
 * @param int        $width  Image width in pixels.
 * @param int        $height Image height in pixels.
 * @param bool|array $crop   Optional. Whether to crop images to specified height and width or resize.
 *                           An array can specify positioning of the crop area. Default false.
 */
function add_image_size( $name, $width = 0, $height = 0, $crop = false ) {
        global $_wp_additional_image_sizes;

        $_wp_additional_image_sizes[ $name ] = array(
                'width'  => absint( $width ),
                'height' => absint( $height ),
                'crop'   => $crop,
        );
}

/**
 * Check if an image size exists.
 *
 * @since 3.9.0
 *
 * @param string $name The image size to check.
 * @return bool True if the image size exists, false if not.
 */
function has_image_size( $name ) {
        global $_wp_additional_image_sizes;

        return isset( $_wp_additional_image_sizes[ $name ] );
}

/**
 * Remove a new image size.
 *
 * @since 3.9.0
 *
 * @param string $name The image size to remove.
 * @return bool True if the image size was successfully removed, false on failure.
 */
function remove_image_size( $name ) {
        global $_wp_additional_image_sizes;

        if ( isset( $_wp_additional_image_sizes[ $name ] ) ) {
                unset( $_wp_additional_image_sizes[ $name ] );
                return true;
        }

        return false;
}

/**
 * Registers an image size for the post thumbnail.
 *
 * @since 2.9.0
 *
 * @see add_image_size() for details on cropping behavior.
 *
 * @param int        $width  Image width in pixels.
 * @param int        $height Image height in pixels.
 * @param bool|array $crop   Optional. Whether to crop images to specified height and width or resize.
 *                           An array can specify positioning of the crop area. Default false.
 */
function set_post_thumbnail_size( $width = 0, $height = 0, $crop = false ) {
        add_image_size( 'post-thumbnail', $width, $height, $crop );
}

/**
 * An <img src /> tag for an image attachment, scaling it down if requested.
 *
 * The filter 'get_image_tag_class' allows for changing the class name for the
 * image without having to use regular expressions on the HTML content. The
 * parameters are: what WordPress will use for the class, the Attachment ID,
 * image align value, and the size the image should be.
 *
 * The second filter 'get_image_tag' has the HTML content, which can then be
 * further manipulated by a plugin to change all attribute values and even HTML
 * content.
 *
 * @since 2.5.0
 *
 * @param int $id Attachment ID.
 * @param string $alt Image Description for the alt attribute.
 * @param string $title Image Description for the title attribute.
 * @param string $align Part of the class name for aligning the image.
 * @param string $size Optional. Default is 'medium'.
 * @return string HTML IMG element for given image attachment
 */
function get_image_tag($id, $alt, $title, $align, $size='medium') {

        list( $img_src, $width, $height ) = image_downsize($id, $size);
        $hwstring = image_hwstring($width, $height);

        $title = $title ? 'title="' . esc_attr( $title ) . '" ' : '';

        $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;

        /**
         * Filter the value of the attachment's image tag class attribute.
         *
         * @since 2.6.0
         *
         * @param string $class CSS class name or space-separated list of classes.
         * @param int    $id    Attachment ID.
         * @param string $align Part of the class name for aligning the image.
         * @param string $size  Optional. Default is 'medium'.
         */
        $class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size );

        $html = '<img src="' . esc_attr($img_src) . '" alt="' . esc_attr($alt) . '" ' . $title . $hwstring . 'class="' . $class . '" />';

        /**
         * Filter the HTML content for the image tag.
         *
         * @since 2.6.0
         *
         * @param string $html  HTML content for the image.
         * @param int    $id    Attachment ID.
         * @param string $alt   Alternate text.
         * @param string $title Attachment title.
         * @param string $align Part of the class name for aligning the image.
         * @param string $size  Optional. Default is 'medium'.
         */
        $html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );

        return $html;
}

/**
 * Calculates the new dimensions for a downsampled image.
 *
 * If either width or height are empty, no constraint is applied on
 * that dimension.
 *
 * @since 2.5.0
 *
 * @param int $current_width Current width of the image.
 * @param int $current_height Current height of the image.
 * @param int $max_width Optional. Maximum wanted width.
 * @param int $max_height Optional. Maximum wanted height.
 * @return array First item is the width, the second item is the height.
 */
function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) {
        if ( !$max_width and !$max_height )
                return array( $current_width, $current_height );

        $width_ratio = $height_ratio = 1.0;
        $did_width = $did_height = false;

        if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width ) {
                $width_ratio = $max_width / $current_width;
                $did_width = true;
        }

        if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height ) {
                $height_ratio = $max_height / $current_height;
                $did_height = true;
        }

        // Calculate the larger/smaller ratios
        $smaller_ratio = min( $width_ratio, $height_ratio );
        $larger_ratio  = max( $width_ratio, $height_ratio );

        if ( (int) round( $current_width * $larger_ratio ) > $max_width || (int) round( $current_height * $larger_ratio ) > $max_height ) {
                // The larger ratio is too big. It would result in an overflow.
                $ratio = $smaller_ratio;
        } else {
                // The larger ratio fits, and is likely to be a more "snug" fit.
                $ratio = $larger_ratio;
        }

        // Very small dimensions may result in 0, 1 should be the minimum.
        $w = max ( 1, (int) round( $current_width  * $ratio ) );
        $h = max ( 1, (int) round( $current_height * $ratio ) );

        // Sometimes, due to rounding, we'll end up with a result like this: 465x700 in a 177x177 box is 117x176... a pixel short
        // We also have issues with recursive calls resulting in an ever-changing result. Constraining to the result of a constraint should yield the original result.
        // Thus we look for dimensions that are one pixel shy of the max value and bump them up

        // Note: $did_width means it is possible $smaller_ratio == $width_ratio.
        if ( $did_width && $w == $max_width - 1 ) {
                $w = $max_width; // Round it up
        }

        // Note: $did_height means it is possible $smaller_ratio == $height_ratio.
        if ( $did_height && $h == $max_height - 1 ) {
                $h = $max_height; // Round it up
        }

        return apply_filters( 'wp_constrain_dimensions', array( $w, $h ), $current_width, $current_height, $max_width, $max_height );
}

/**
 * Retrieve calculated resize dimensions for use in WP_Image_Editor.
 *
 * Calculates dimensions and coordinates for a resized image that fits
 * within a specified width and height.
 *
 * Cropping behavior is dependent on the value of $crop:
 * 1. If false (default), images will not be cropped.
 * 2. If an array in the form of array( x_crop_position, y_crop_position ):
 *    - x_crop_position accepts 'left' 'center', or 'right'.
 *    - y_crop_position accepts 'top', 'center', or 'bottom'.
 *    Images will be cropped to the specified dimensions within the defined crop area.
 * 3. If true, images will be cropped to the specified dimensions using center positions.
 *
 * @since 2.5.0
 *
 * @param int        $orig_w Original width in pixels.
 * @param int        $orig_h Original height in pixels.
 * @param int        $dest_w New width in pixels.
 * @param int        $dest_h New height in pixels.
 * @param bool|array $crop   Optional. Whether to crop image to specified height and width or resize.
 *                           An array can specify positioning of the crop area. Default false.
 * @return bool|array False on failure. Returned array matches parameters for `imagecopyresampled()`.
 */
function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop = false) {

        if ($orig_w <= 0 || $orig_h <= 0)
                return false;
        // at least one of dest_w or dest_h must be specific
        if ($dest_w <= 0 && $dest_h <= 0)
                return false;

        /**
         * Filter whether to preempt calculating the image resize dimensions.
         *
         * Passing a non-null value to the filter will effectively short-circuit
         * image_resize_dimensions(), returning that value instead.
         *
         * @since 3.4.0
         *
         * @param null|mixed $null   Whether to preempt output of the resize dimensions.
         * @param int        $orig_w Original width in pixels.
         * @param int        $orig_h Original height in pixels.
         * @param int        $dest_w New width in pixels.
         * @param int        $dest_h New height in pixels.
         * @param bool|array $crop   Whether to crop image to specified height and width or resize.
         *                           An array can specify positioning of the crop area. Default false.
         */
        $output = apply_filters( 'image_resize_dimensions', null, $orig_w, $orig_h, $dest_w, $dest_h, $crop );
        if ( null !== $output )
                return $output;

        if ( $crop ) {
                // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
                $aspect_ratio = $orig_w / $orig_h;
                $new_w = min($dest_w, $orig_w);
                $new_h = min($dest_h, $orig_h);

                if ( ! $new_w ) {
                        $new_w = (int) round( $new_h * $aspect_ratio );
                }

                if ( ! $new_h ) {
                        $new_h = (int) round( $new_w / $aspect_ratio );
                }

                $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);

                $crop_w = round($new_w / $size_ratio);
                $crop_h = round($new_h / $size_ratio);

                if ( ! is_array( $crop ) || count( $crop ) !== 2 ) {
                        $crop = array( 'center', 'center' );
                }

                list( $x, $y ) = $crop;

                if ( 'left' === $x ) {
                        $s_x = 0;
                } elseif ( 'right' === $x ) {
                        $s_x = $orig_w - $crop_w;
                } else {
                        $s_x = floor( ( $orig_w - $crop_w ) / 2 );
                }

                if ( 'top' === $y ) {
                        $s_y = 0;
                } elseif ( 'bottom' === $y ) {
                        $s_y = $orig_h - $crop_h;
                } else {
                        $s_y = floor( ( $orig_h - $crop_h ) / 2 );
                }
        } else {
                // don't crop, just resize using $dest_w x $dest_h as a maximum bounding box
                $crop_w = $orig_w;
                $crop_h = $orig_h;

                $s_x = 0;
                $s_y = 0;

                list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
        }

        // if the resulting image would be the same size or larger we don't want to resize it
        if ( $new_w >= $orig_w && $new_h >= $orig_h && $dest_w != $orig_w && $dest_h != $orig_h ) {
                return false;
        }

        // the return array matches the parameters to imagecopyresampled()
        // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
        return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );

}

/**
 * Resize an image to make a thumbnail or intermediate size.
 *
 * The returned array has the file size, the image width, and image height. The
 * filter 'image_make_intermediate_size' can be used to hook in and change the
 * values of the returned array. The only parameter is the resized file path.
 *
 * @since 2.5.0
 *
 * @param string $file File path.
 * @param int $width Image width.
 * @param int $height Image height.
 * @param bool $crop Optional, default is false. Whether to crop image to specified height and width or resize.
 * @return bool|array False, if no image was created. Metadata array on success.
 */
function image_make_intermediate_size( $file, $width, $height, $crop = false ) {
        if ( $width || $height ) {
                $editor = wp_get_image_editor( $file );

                if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) )
                        return false;

                $resized_file = $editor->save();

                if ( ! is_wp_error( $resized_file ) && $resized_file ) {
                        unset( $resized_file['path'] );
                        return $resized_file;
                }
        }
        return false;
}

/**
 * Retrieve the image's intermediate size (resized) path, width, and height.
 *
 * The $size parameter can be an array with the width and height respectively.
 * If the size matches the 'sizes' metadata array for width and height, then it
 * will be used. If there is no direct match, then the nearest image size larger
 * than the specified size will be used. If nothing is found, then the function
 * will break out and return false.
 *
 * The metadata 'sizes' is used for compatible sizes that can be used for the
 * parameter $size value.
 *
 * The url path will be given, when the $size parameter is a string.
 *
 * If you are passing an array for the $size, you should consider using
 * add_image_size() so that a cropped version is generated. It's much more
 * efficient than having to find the closest-sized image and then having the
 * browser scale down the image.
 *
 * @since 2.5.0
 * @see add_image_size()
 *
 * @param int $post_id Attachment ID for image.
 * @param array|string $size Optional, default is 'thumbnail'. Size of image, either array or string.
 * @return bool|array False on failure or array of file path, width, and height on success.
 */
function image_get_intermediate_size($post_id, $size='thumbnail') {
        if ( !is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) )
                return false;

        // get the best one for a specified set of dimensions
        if ( is_array($size) && !empty($imagedata['sizes']) ) {
                foreach ( $imagedata['sizes'] as $_size => $data ) {
                        // already cropped to width or height; so use this size
                        if ( ( $data['width'] == $size[0] && $data['height'] <= $size[1] ) || ( $data['height'] == $size[1] && $data['width'] <= $size[0] ) ) {
                                $file = $data['file'];
                                list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
                                return compact( 'file', 'width', 'height' );
                        }
                        // add to lookup table: area => size
                        $areas[$data['width'] * $data['height']] = $_size;
                }
                if ( !$size || !empty($areas) ) {
                        // find for the smallest image not smaller than the desired size
                        ksort($areas);
                        foreach ( $areas as $_size ) {
                                $data = $imagedata['sizes'][$_size];
                                if ( $data['width'] >= $size[0] || $data['height'] >= $size[1] ) {
                                        // Skip images with unexpectedly divergent aspect ratios (crops)
                                        // First, we calculate what size the original image would be if constrained to a box the size of the current image in the loop
                                        $maybe_cropped = image_resize_dimensions($imagedata['width'], $imagedata['height'], $data['width'], $data['height'], false );
                                        // If the size doesn't match within one pixel, then it is of a different aspect ratio, so we skip it, unless it's the thumbnail size
                                        if ( 'thumbnail' != $_size && ( !$maybe_cropped || ( $maybe_cropped[4] != $data['width'] && $maybe_cropped[4] + 1 != $data['width'] ) || ( $maybe_cropped[5] != $data['height'] && $maybe_cropped[5] + 1 != $data['height'] ) ) )
                                                continue;
                                        // If we're still here, then we're going to use this size
                                        $file = $data['file'];
                                        list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
                                        return compact( 'file', 'width', 'height' );
                                }
                        }
                }
        }

        if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) )
                return false;

        $data = $imagedata['sizes'][$size];
        // include the full filesystem path of the intermediate file
        if ( empty($data['path']) && !empty($data['file']) ) {
                $file_url = wp_get_attachment_url($post_id);
                $data['path'] = path_join( dirname($imagedata['file']), $data['file'] );
                $data['url'] = path_join( dirname($file_url), $data['file'] );
        }
        return $data;
}

/**
 * Get the available image sizes
 * @since 3.0.0
 * @return array Returns a filtered array of image size strings
 */
function get_intermediate_image_sizes() {
        global $_wp_additional_image_sizes;
        $image_sizes = array('thumbnail', 'medium', 'large'); // Standard sizes
        if ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) )
                $image_sizes = array_merge( $image_sizes, array_keys( $_wp_additional_image_sizes ) );

        /**
         * Filter the list of intermediate image sizes.
         *
         * @since 2.5.0
         *
         * @param array $image_sizes An array of intermediate image sizes. Defaults
         *                           are 'thumbnail', 'medium', 'large'.
         */
        return apply_filters( 'intermediate_image_sizes', $image_sizes );
}

/**
 * Retrieve an image to represent an attachment.
 *
 * A mime icon for files, thumbnail or intermediate size for images.
 *
 * @since 2.5.0
 *
 * @param int $attachment_id Image attachment ID.
 * @param string $size Optional, default is 'thumbnail'.
 * @param bool $icon Optional, default is false. Whether it is an icon.
 * @return bool|array Returns an array (url, width, height), or false, if no image is available.
 */
function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {

        // get a thumbnail or intermediate image if there is one
        if ( $image = image_downsize($attachment_id, $size) )
                return $image;

        $src = false;

        if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {
                /** This filter is documented in wp-includes/post.php */
                $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );
                $src_file = $icon_dir . '/' . wp_basename($src);
                @list($width, $height) = getimagesize($src_file);
        }
        if ( $src && $width && $height )
                return array( $src, $width, $height );
        return false;
}

/**
 * Get an HTML img element representing an image attachment
 *
 * While $size will accept an array, it is better to register a size with
 * add_image_size() so that a cropped version is generated. It's much more
 * efficient than having to find the closest-sized image and then having the
 * browser scale down the image.
 *
 * @since 2.5.0
 *
 * @see add_image_size()
 *
 * @param int          $attachment_id Image attachment ID.
 * @param string|array $size          Optional. Default 'thumbnail'.
 * @param bool         $icon          Optional. Whether it is an icon. Default false.
 * @param string|array $attr          Optional. Attributes for the image markup. Default empty string.
 * @return string HTML img element or empty string on failure.
 */
function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false, $attr = '') {

        $html = '';
        $image = wp_get_attachment_image_src($attachment_id, $size, $icon);
        if ( $image ) {
                list($src, $width, $height) = $image;
                $hwstring = image_hwstring($width, $height);
                $size_class = $size;
                if ( is_array( $size_class ) ) {
                        $size_class = join( 'x', $size_class );
                }
                $attachment = get_post($attachment_id);
                $default_attr = array(
                        'src'   => $src,
                        'class' => "attachment-$size_class",
                        'alt'   => trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )), // Use Alt field first
                );
                if ( empty($default_attr['alt']) )
                        $default_attr['alt'] = trim(strip_tags( $attachment->post_excerpt )); // If not, Use the Caption
                if ( empty($default_attr['alt']) )
                        $default_attr['alt'] = trim(strip_tags( $attachment->post_title )); // Finally, use the title

                $attr = wp_parse_args($attr, $default_attr);

                /**
                 * Filter the list of attachment image attributes.
                 *
                 * @since 2.8.0
                 *
                 * @param array        $attr       Attributes for the image markup.
                 * @param WP_Post      $attachment Image attachment post.
                 * @param string|array $size       Requested size.
                 */
                $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment, $size );
                $attr = array_map( 'esc_attr', $attr );
                $html = rtrim("<img $hwstring");
                foreach ( $attr as $name => $value ) {
                        $html .= " $name=" . '"' . $value . '"';
                }
                $html .= ' />';
        }

        return $html;
}

/**
 * Adds a 'wp-post-image' class to post thumbnails
 * Uses the begin_fetch_post_thumbnail_html and end_fetch_post_thumbnail_html action hooks to
 * dynamically add/remove itself so as to only filter post thumbnails
 *
 * @since 2.9.0
 * @param array $attr Attributes including src, class, alt, title
 * @return array
 */
function _wp_post_thumbnail_class_filter( $attr ) {
        $attr['class'] .= ' wp-post-image';
        return $attr;
}

/**
 * Adds _wp_post_thumbnail_class_filter to the wp_get_attachment_image_attributes filter
 *
 * @since 2.9.0
 */
function _wp_post_thumbnail_class_filter_add( $attr ) {
        add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
}

/**
 * Removes _wp_post_thumbnail_class_filter from the wp_get_attachment_image_attributes filter
 *
 * @since 2.9.0
 */
function _wp_post_thumbnail_class_filter_remove( $attr ) {
        remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
}

add_shortcode('wp_caption', 'img_caption_shortcode');
add_shortcode('caption', 'img_caption_shortcode');

/**
 * The Caption shortcode.
 *
 * Allows a plugin to replace the content that would otherwise be returned. The
 * filter is 'img_caption_shortcode' and passes an empty string, the attr
 * parameter and the content parameter values.
 *
 * The supported attributes for the shortcode are 'id', 'align', 'width', and
 * 'caption'.
 *
 * @since 2.6.0
 *
 * @param array $attr {
 *     Attributes of the caption shortcode.
 *
 *     @type string $id      ID of the div element for the caption.
 *     @type string $align   Class name that aligns the caption. Default 'alignnone'. Accepts 'alignleft',
 *                           'aligncenter', alignright', 'alignnone'.
 *     @type int    $width   The width of the caption, in pixels.
 *     @type string $caption The caption text.
 *     @type string $class   Additional class name(s) added to the caption container.
 * }
 * @param string $content Optional. Shortcode content.
 * @return string HTML content to display the caption.
 */
function img_caption_shortcode( $attr, $content = null ) {
        // New-style shortcode with the caption inside the shortcode with the link and image tags.
        if ( ! isset( $attr['caption'] ) ) {
                if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) {
                        $content = $matches[1];
                        $attr['caption'] = trim( $matches[2] );
                }
        }

        /**
         * Filter the default caption shortcode output.
         *
         * If the filtered output isn't empty, it will be used instead of generating
         * the default caption template.
         *
         * @since 2.6.0
         *
         * @see img_caption_shortcode()
         *
         * @param string $output  The caption output. Default empty.
         * @param array  $attr    Attributes of the caption shortcode.
         * @param string $content The image element, possibly wrapped in a hyperlink.
         */
        $output = apply_filters( 'img_caption_shortcode', '', $attr, $content );
        if ( $output != '' )
                return $output;

        $atts = shortcode_atts( array(
                'id'      => '',
                'align'   => 'alignnone',
                'width'   => '',
                'caption' => '',
                'class'   => '',
        ), $attr, 'caption' );

        $atts['width'] = (int) $atts['width'];
        if ( $atts['width'] < 1 || empty( $atts['caption'] ) )
                return $content;

        if ( ! empty( $atts['id'] ) )
                $atts['id'] = 'id="' . esc_attr( $atts['id'] ) . '" ';

        $class = trim( 'wp-caption ' . $atts['align'] . ' ' . $atts['class'] );

        if ( current_theme_supports( 'html5', 'caption' ) ) {
                return '<figure ' . $atts['id'] . 'style="width: ' . (int) $atts['width'] . 'px;" class="' . esc_attr( $class ) . '">'
                . do_shortcode( $content ) . '<figcaption class="wp-caption-text">' . $atts['caption'] . '</figcaption></figure>';
        }

        $caption_width = 10 + $atts['width'];

        /**
         * Filter the width of an image's caption.
         *
         * By default, the caption is 10 pixels greater than the width of the image,
         * to prevent post content from running up against a floated image.
         *
         * @since 3.7.0
         *
         * @see img_caption_shortcode()
         *
         * @param int    $caption_width Width of the caption in pixels. To remove this inline style,
         *                              return zero.
         * @param array  $atts          Attributes of the caption shortcode.
         * @param string $content       The image element, possibly wrapped in a hyperlink.
         */
        $caption_width = apply_filters( 'img_caption_shortcode_width', $caption_width, $atts, $content );

        $style = '';
        if ( $caption_width )
                $style = 'style="width: ' . (int) $caption_width . 'px" ';

        return '<div ' . $atts['id'] . $style . 'class="' . esc_attr( $class ) . '">'
        . do_shortcode( $content ) . '<p class="wp-caption-text">' . $atts['caption'] . '</p></div>';
}

add_shortcode('gallery', 'gallery_shortcode');

/**
 * The Gallery shortcode.
 *
 * This implements the functionality of the Gallery Shortcode for displaying
 * WordPress images on a post.
 *
 * @since 2.5.0
 *
 * @param array $attr {
 *     Attributes of the gallery shortcode.
 *
 *     @type string $order      Order of the images in the gallery. Default 'ASC'. Accepts 'ASC', 'DESC'.
 *     @type string $orderby    The field to use when ordering the images. Default 'menu_order ID'.
 *                              Accepts any valid SQL ORDERBY statement.
 *     @type int    $id         Post ID.
 *     @type string $itemtag    HTML tag to use for each image in the gallery.
 *                              Default 'dl', or 'figure' when the theme registers HTML5 gallery support.
 *     @type string $icontag    HTML tag to use for each image's icon.
 *                              Default 'dt', or 'div' when the theme registers HTML5 gallery support.
 *     @type string $captiontag HTML tag to use for each image's caption.
 *                              Default 'dd', or 'figcaption' when the theme registers HTML5 gallery support.
 *     @type int    $columns    Number of columns of images to display. Default 3.
 *     @type string $size       Size of the images to display. Default 'thumbnail'.
 *     @type string $ids        A comma-separated list of IDs of attachments to display. Default empty.
 *     @type string $include    A comma-separated list of IDs of attachments to include. Default empty.
 *     @type string $exclude    A comma-separated list of IDs of attachments to exclude. Default empty.
 *     @type string $link       What to link each image to. Default empty (links to the attachment page).
 *                              Accepts 'file', 'none'.
 * }
 * @return string HTML content to display gallery.
 */
function gallery_shortcode( $attr ) {
        $post = get_post();

        static $instance = 0;
        $instance++;

        if ( ! empty( $attr['ids'] ) ) {
                // 'ids' is explicitly ordered, unless you specify otherwise.
                if ( empty( $attr['orderby'] ) ) {
                        $attr['orderby'] = 'post__in';
                }
                $attr['include'] = $attr['ids'];
        }

        /**
         * Filter the default gallery shortcode output.
         *
         * If the filtered output isn't empty, it will be used instead of generating
         * the default gallery template.
         *
         * @since 2.5.0
         *
         * @see gallery_shortcode()
         *
         * @param string $output The gallery output. Default empty.
         * @param array  $attr   Attributes of the gallery shortcode.
         */
        $output = apply_filters( 'post_gallery', '', $attr );
        if ( $output != '' ) {
                return $output;
        }

        $html5 = current_theme_supports( 'html5', 'gallery' );
        $atts = shortcode_atts( array(
                'order'      => 'ASC',
                'orderby'    => 'menu_order ID',
                'id'         => $post ? $post->ID : 0,
                'itemtag'    => $html5 ? 'figure'     : 'dl',
                'icontag'    => $html5 ? 'div'        : 'dt',
                'captiontag' => $html5 ? 'figcaption' : 'dd',
                'columns'    => 3,
                'size'       => 'thumbnail',
                'include'    => '',
                'exclude'    => '',
                'link'       => ''
        ), $attr, 'gallery' );

        $id = intval( $atts['id'] );

        if ( ! empty( $atts['include'] ) ) {
                $_attachments = get_posts( array( 'include' => $atts['include'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );

                $attachments = array();
                foreach ( $_attachments as $key => $val ) {
                        $attachments[$val->ID] = $_attachments[$key];
                }
        } elseif ( ! empty( $atts['exclude'] ) ) {
                $attachments = get_children( array( 'post_parent' => $id, 'exclude' => $atts['exclude'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );
        } else {
                $attachments = get_children( array( 'post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );
        }

        if ( empty( $attachments ) ) {
                return '';
        }

        if ( is_feed() ) {
                $output = "\n";
                foreach ( $attachments as $att_id => $attachment ) {
                        $output .= wp_get_attachment_link( $att_id, $atts['size'], true ) . "\n";
                }
                return $output;
        }

        $itemtag = tag_escape( $atts['itemtag'] );
        $captiontag = tag_escape( $atts['captiontag'] );
        $icontag = tag_escape( $atts['icontag'] );
        $valid_tags = wp_kses_allowed_html( 'post' );
        if ( ! isset( $valid_tags[ $itemtag ] ) ) {
                $itemtag = 'dl';
        }
        if ( ! isset( $valid_tags[ $captiontag ] ) ) {
                $captiontag = 'dd';
        }
        if ( ! isset( $valid_tags[ $icontag ] ) ) {
                $icontag = 'dt';
        }

        $columns = intval( $atts['columns'] );
        $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
        $float = is_rtl() ? 'right' : 'left';

        $selector = "gallery-{$instance}";

        $gallery_style = '';

        /**
         * Filter whether to print default gallery styles.
         *
         * @since 3.1.0
         *
         * @param bool $print Whether to print default gallery styles.
         *                    Defaults to false if the theme supports HTML5 galleries.
         *                    Otherwise, defaults to true.
         */
        if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {
                $gallery_style = "
                <style type='text/css'>
                        #{$selector} {
                                margin: auto;
                        }
                        #{$selector} .gallery-item {
                                float: {$float};
                                margin-top: 10px;
                                text-align: center;
                                width: {$itemwidth}%;
                        }
                        #{$selector} img {
                                border: 2px solid #cfcfcf;
                        }
                        #{$selector} .gallery-caption {
                                margin-left: 0;
                        }
                        /* see gallery_shortcode() in wp-includes/media.php */
                </style>\n\t\t";
        }

        $size_class = sanitize_html_class( $atts['size'] );
        $gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";

        /**
         * Filter the default gallery shortcode CSS styles.
         *
         * @since 2.5.0
         *
         * @param string $gallery_style Default CSS styles and opening HTML div container
         *                              for the gallery shortcode output.
         */
        $output = apply_filters( 'gallery_style', $gallery_style . $gallery_div );

        $i = 0;
        foreach ( $attachments as $id => $attachment ) {

                $attr = ( trim( $attachment->post_excerpt ) ) ? array( 'aria-describedby' => "$selector-$id" ) : '';
                if ( ! empty( $atts['link'] ) && 'file' === $atts['link'] ) {
                        $image_output = wp_get_attachment_link( $id, $atts['size'], false, false, false, $attr );
                } elseif ( ! empty( $atts['link'] ) && 'none' === $atts['link'] ) {
                        $image_output = wp_get_attachment_image( $id, $atts['size'], false, $attr );
                } else {
                        $image_output = wp_get_attachment_link( $id, $atts['size'], true, false, false, $attr );
                }
                $image_meta  = wp_get_attachment_metadata( $id );

                $orientation = '';
                if ( isset( $image_meta['height'], $image_meta['width'] ) ) {
                        $orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';
                }
                $output .= "<{$itemtag} class='gallery-item'>";
                $output .= "
                        <{$icontag} class='gallery-icon {$orientation}'>
                                $image_output
                        </{$icontag}>";
                if ( $captiontag && trim($attachment->post_excerpt) ) {
                        $output .= "
                                <{$captiontag} class='wp-caption-text gallery-caption' id='$selector-$id'>
                                " . wptexturize($attachment->post_excerpt) . "
                                </{$captiontag}>";
                }
                $output .= "</{$itemtag}>";
                if ( ! $html5 && $columns > 0 && ++$i % $columns == 0 ) {
                        $output .= '<br style="clear: both" />';
                }
        }

        if ( ! $html5 && $columns > 0 && $i % $columns !== 0 ) {
                $output .= "
                        <br style='clear: both' />";
        }

        $output .= "
                </div>\n";

        return $output;
}

/**
 * Output the templates used by playlists.
 *
 * @since 3.9.0
 */
function wp_underscore_playlist_templates() {
?>
        <?php
        $result = do_action('tmpl-wp-playlist-tracks');
        if ($result !== true) { ?>

<script type="text/html" id="tmpl-wp-playlist-tracks">
        <div class="wp-playlist-tracks container-fluid"></div>
</script>

        <?php
        }
        $result = do_action('tmpl-wp-playlist-current-item');
        if ($result !== true) { ?>

<script type="text/html" id="tmpl-wp-playlist-current-item">
        <# if ( data.image ) { #>
        <img src="{{ data.thumb.src }}"/>
        <# } #>
        <div class="wp-playlist-caption">
                <span class="wp-playlist-item-meta wp-playlist-item-title">&#8220;{{ data.title }}&#8221;</span>
                <# if ( data.meta.album ) { #><span class="wp-playlist-item-meta wp-playlist-item-album">{{ data.meta.album }}</span><# } #>
                <# if ( data.meta.artist ) { #><span class="wp-playlist-item-meta wp-playlist-item-artist">{{ data.meta.artist }}</span><# } #>
        </div>
</script>

        <?php
        }
        $result = do_action('tmpl-wp-playlist-item');
        if ($result !== true) { ?>

<script type="text/html" id="tmpl-wp-playlist-item">
        <div class="wp-playlist-item">
                <a class="wp-playlist-caption" href="{{ data.src }}">
                        {{ data.index ? ( data.index + '. ' ) : '' }}
                        <# if ( data.caption ) { #>
                                {{ data.caption }}
                        <# } else { #>
                                <span class="wp-playlist-item-title">&#8220;{{{ data.title }}}&#8221;</span>
                                <# if ( data.artists && data.meta.artist ) { #>
                                <span class="wp-playlist-item-artist"> &mdash; {{ data.meta.artist }}</span>
                                <# } #>
                        <# } #>
                </a>
                <# if ( data.meta.length_formatted ) { #>
                <div class="wp-playlist-item-length">{{ data.meta.length_formatted }}</div>
                <# } #>
        </div>
</script>
<?php
        }
}

/**
 * Output and enqueue default scripts and styles for playlists.
 *
 * @since 3.9.0
 *
 * @param string $type Type of playlist. Accepts 'audio' or 'video'.
 */
function wp_playlist_scripts( $type ) {
        wp_enqueue_style( 'wp-mediaelement' );
        wp_enqueue_script( 'wp-playlist' );
?>
<!--[if lt IE 9]><script>document.createElement('<?php echo esc_js( $type ) ?>');</script><![endif]-->
<?php
        add_action( 'wp_footer', 'wp_underscore_playlist_templates', 0 );
        add_action( 'admin_footer', 'wp_underscore_playlist_templates', 0 );
}
add_action( 'wp_playlist_scripts', 'wp_playlist_scripts' );

/**
 * The playlist shortcode.
 *
 * This implements the functionality of the playlist shortcode for displaying
 * a collection of WordPress audio or video files in a post.
 *
 * @since 3.9.0
 *
 * @param array $attr {
 *     Array of default playlist attributes.
 *
 *     @type string  $type         Type of playlist to display. Accepts 'audio' or 'video'. Default 'audio'.
 *     @type string  $order        Designates ascending or descending order of items in the playlist.
 *                                 Accepts 'ASC', 'DESC'. Default 'ASC'.
 *     @type string  $orderby      Any column, or columns, to sort the playlist. If $ids are
 *                                 passed, this defaults to the order of the $ids array ('post__in').
 *                                 Otherwise default is 'menu_order ID'.
 *     @type int     $id           If an explicit $ids array is not present, this parameter
 *                                 will determine which attachments are used for the playlist.
 *                                 Default is the current post ID.
 *     @type array   $ids          Create a playlist out of these explicit attachment IDs. If empty,
 *                                 a playlist will be created from all $type attachments of $id.
 *                                 Default empty.
 *     @type array   $exclude      List of specific attachment IDs to exclude from the playlist. Default empty.
 *     @type string  $style        Playlist style to use. Accepts 'light' or 'dark'. Default 'light'.
 *     @type bool    $tracklist    Whether to show or hide the playlist. Default true.
 *     @type bool    $tracknumbers Whether to show or hide the numbers next to entries in the playlist. Default true.
 *     @type bool    $images       Show or hide the video or audio thumbnail (Featured Image/post
 *                                 thumbnail). Default true.
 *     @type bool    $artists      Whether to show or hide artist name in the playlist. Default true.
 * }
 *
 * @return string Playlist output. Empty string if the passed type is unsupported.
 */
function wp_playlist_shortcode( $attr ) {
        global $content_width;
        $post = get_post();

        static $instance = 0;
        $instance++;

        if ( ! empty( $attr['ids'] ) ) {
                // 'ids' is explicitly ordered, unless you specify otherwise.
                if ( empty( $attr['orderby'] ) ) {
                        $attr['orderby'] = 'post__in';
                }
                $attr['include'] = $attr['ids'];
        }

        /**
         * Filter the playlist output.
         *
         * Passing a non-empty value to the filter will short-circuit generation
         * of the default playlist output, returning the passed value instead.
         *
         * @since 3.9.0
         *
         * @param string $output Playlist output. Default empty.
         * @param array  $attr   An array of shortcode attributes.
         */
        $output = apply_filters( 'post_playlist', '', $attr );
        if ( $output != '' ) {
                return $output;
        }

        $atts = shortcode_atts( array(
                'type'          => 'audio',
                'order'         => 'ASC',
                'orderby'       => 'menu_order ID',
                'id'            => $post ? $post->ID : 0,
                'include'       => '',
                'exclude'   => '',
                'style'         => 'light',
                'tracklist' => true,
                'tracknumbers' => true,
                'images'        => true,
                'artists'       => true
        ), $attr, 'playlist' );

        $id = intval( $atts['id'] );

        if ( $atts['type'] !== 'audio' ) {
                $atts['type'] = 'video';
        }

        $args = array(
                'post_status' => 'inherit',
                'post_type' => 'attachment',
                'post_mime_type' => $atts['type'],
                'order' => $atts['order'],
                'orderby' => $atts['orderby']
        );

        if ( ! empty( $atts['include'] ) ) {
                $args['include'] = $atts['include'];
                $_attachments = get_posts( $args );

                $attachments = array();
                foreach ( $_attachments as $key => $val ) {
                        $attachments[$val->ID] = $_attachments[$key];
                }
        } elseif ( ! empty( $atts['exclude'] ) ) {
                $args['post_parent'] = $id;
                $args['exclude'] = $atts['exclude'];
                $attachments = get_children( $args );
        } else {
                $args['post_parent'] = $id;
                $attachments = get_children( $args );
        }

        if ( empty( $attachments ) ) {
                return '';
        }

        if ( is_feed() ) {
                $output = "\n";
                foreach ( $attachments as $att_id => $attachment ) {
                        $output .= wp_get_attachment_link( $att_id ) . "\n";
                }
                return $output;
        }

        $outer = 22; // default padding and border of wrapper

        $default_width = 640;
        $default_height = 360;

        $theme_width = empty( $content_width ) ? $default_width : ( $content_width - $outer );
        $theme_height = empty( $content_width ) ? $default_height : round( ( $default_height * $theme_width ) / $default_width );

        $data = array(
                'type' => $atts['type'],
                // don't pass strings to JSON, will be truthy in JS
                'tracklist' => wp_validate_boolean( $atts['tracklist'] ),
                'tracknumbers' => wp_validate_boolean( $atts['tracknumbers'] ),
                'images' => wp_validate_boolean( $atts['images'] ),
                'artists' => wp_validate_boolean( $atts['artists'] ),
        );

        $tracks = array();
        foreach ( $attachments as $attachment ) {
                $url = wp_get_attachment_url( $attachment->ID );
                $ftype = wp_check_filetype( $url, wp_get_mime_types() );
                $track = array(
                        'src' => $url,
                        'type' => $ftype['type'],
                        'title' => $attachment->post_title,
                        'caption' => $attachment->post_excerpt,
                        'description' => $attachment->post_content
                );

                $track['meta'] = array();
                $meta = wp_get_attachment_metadata( $attachment->ID );
                if ( ! empty( $meta ) ) {

                        foreach ( wp_get_attachment_id3_keys( $attachment ) as $key => $label ) {
                                if ( ! empty( $meta[ $key ] ) ) {
                                        $track['meta'][ $key ] = $meta[ $key ];
                                }
                        }

                        if ( 'video' === $atts['type'] ) {
                                if ( ! empty( $meta['width'] ) && ! empty( $meta['height'] ) ) {
                                        $width = $meta['width'];
                                        $height = $meta['height'];
                                        $theme_height = round( ( $height * $theme_width ) / $width );
                                } else {
                                        $width = $default_width;
                                        $height = $default_height;
                                }

                                $track['dimensions'] = array(
                                        'original' => compact( 'width', 'height' ),
                                        'resized' => array(
                                                'width' => $theme_width,
                                                'height' => $theme_height
                                        )
                                );
                        }
                }

                if ( $atts['images'] ) {
                        $thumb_id = get_post_thumbnail_id( $attachment->ID );
                        if ( ! empty( $thumb_id ) ) {
                                list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'full' );
                                $track['image'] = compact( 'src', 'width', 'height' );
                                list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'thumbnail' );
                                $track['thumb'] = compact( 'src', 'width', 'height' );
                        } else {
                                $src = wp_mime_type_icon( $attachment->ID );
                                $width = 48;
                                $height = 64;
                                $track['image'] = compact( 'src', 'width', 'height' );
                                $track['thumb'] = compact( 'src', 'width', 'height' );
                        }
                }

                $tracks[] = $track;
        }
        $data['tracks'] = $tracks;

        $safe_type = esc_attr( $atts['type'] );
        $safe_style = esc_attr( $atts['style'] );

        ob_start();

        if ( 1 === $instance ) {
                /**
                 * Print and enqueue playlist scripts, styles, and JavaScript templates.
                 *
                 * @since 3.9.0
                 *
                 * @param string $type  Type of playlist. Possible values are 'audio' or 'video'.
                 * @param string $style The 'theme' for the playlist. Core provides 'light' and 'dark'.
                 */
                do_action( 'wp_playlist_scripts', $atts['type'], $atts['style'] );
        } ?>
<div class="wp-playlist wp-<?php echo $safe_type ?>-playlist wp-playlist-<?php echo $safe_style ?>">
        <?php if ( 'audio' === $atts['type'] ): ?>
        <div class="wp-playlist-current-item"></div>
        <?php endif ?>
        <<?php echo $safe_type ?> controls="controls" preload="none" width="<?php
                echo (int) $theme_width;
        ?>"<?php if ( 'video' === $safe_type ):
                echo ' height="', (int) $theme_height, '"';
        else:
                echo ' style="visibility: hidden"';
        endif; ?>></<?php echo $safe_type ?>>
        <div class="wp-playlist-next"></div>
        <div class="wp-playlist-prev"></div>
        <noscript>
        <ol><?php
        foreach ( $attachments as $att_id => $attachment ) {
                printf( '<li>%s</li>', wp_get_attachment_link( $att_id ) );
        }
        ?></ol>
        </noscript>
        <script type="application/json" class="wp-playlist-script"><?php echo wp_json_encode( $data ) ?></script>
</div>
        <?php
        return ob_get_clean();
}
add_shortcode( 'playlist', 'wp_playlist_shortcode' );

/**
 * Provide a No-JS Flash fallback as a last resort for audio / video
 *
 * @since 3.6.0
 *
 * @param string $url
 * @return string Fallback HTML
 */
function wp_mediaelement_fallback( $url ) {
        /**
         * Filter the Mediaelement fallback output for no-JS.
         *
         * @since 3.6.0
         *
         * @param string $output Fallback output for no-JS.
         * @param string $url    Media file URL.
         */
        return apply_filters( 'wp_mediaelement_fallback', sprintf( '<a href="%1$s">%1$s</a>', esc_url( $url ) ), $url );
}

/**
 * Return a filtered list of WP-supported audio formats.
 *
 * @since 3.6.0
 * @return array
 */
function wp_get_audio_extensions() {
        /**
         * Filter the list of supported audio formats.
         *
         * @since 3.6.0
         *
         * @param array $extensions An array of support audio formats. Defaults are
         *                          'mp3', 'ogg', 'wma', 'm4a', 'wav'.
         */
        return apply_filters( 'wp_audio_extensions', array( 'mp3', 'ogg', 'wma', 'm4a', 'wav' ) );
}

/**
 * Return useful keys to use to lookup data from an attachment's stored metadata.
 *
 * @since 3.9.0
 *
 * @param WP_Post $attachment The current attachment, provided for context.
 * @param string  $context    The context. Accepts 'edit', 'display'. Default 'display'.
 * @return array Key/value pairs of field keys to labels.
 */
function wp_get_attachment_id3_keys( $attachment, $context = 'display' ) {
        $fields = array(
                'artist' => __( 'Artist' ),
                'album' => __( 'Album' ),
        );

        if ( 'display' === $context ) {
                $fields['genre']            = __( 'Genre' );
                $fields['year']             = __( 'Year' );
                $fields['length_formatted'] = _x( 'Length', 'video or audio' );
        } elseif ( 'js' === $context ) {
                $fields['bitrate']          = __( 'Bitrate' );
                $fields['bitrate_mode']     = __( 'Bitrate Mode' );
        }

        /**
         * Filter the editable list of keys to look up data from an attachment's metadata.
         *
         * @since 3.9.0
         *
         * @param array   $fields     Key/value pairs of field keys to labels.
         * @param WP_Post $attachment Attachment object.
         * @param string  $context    The context. Accepts 'edit', 'display'. Default 'display'.
         */
        return apply_filters( 'wp_get_attachment_id3_keys', $fields, $attachment, $context );
}
/**
 * The Audio shortcode.
 *
 * This implements the functionality of the Audio Shortcode for displaying
 * WordPress mp3s in a post.
 *
 * @since 3.6.0
 *
 * @param array $attr {
 *     Attributes of the audio shortcode.
 *
 *     @type string $src      URL to the source of the audio file. Default empty.
 *     @type string $loop     The 'loop' attribute for the `<audio>` element. Default empty.
 *     @type string $autoplay The 'autoplay' attribute for the `<audio>` element. Default empty.
 *     @type string $preload  The 'preload' attribute for the `<audio>` element. Default empty.
 *     @type string $class    The 'class' attribute for the `<audio>` element. Default 'wp-audio-shortcode'.
 *     @type string $id       The 'id' attribute for the `<audio>` element. Default 'audio-{$post_id}-{$instances}'.
 *     @type string $style    The 'style' attribute for the `<audio>` element. Default 'width: 100%'.
 * }
 * @param string $content Optional. Shortcode content.
 * @return string HTML content to display audio.
 */
function wp_audio_shortcode( $attr, $content = '' ) {
        $post_id = get_post() ? get_the_ID() : 0;

        static $instances = 0;
        $instances++;

        /**
         * Filter the default audio shortcode output.
         *
         * If the filtered output isn't empty, it will be used instead of generating the default audio template.
         *
         * @since 3.6.0
         *
         * @param string $html      Empty variable to be replaced with shortcode markup.
         * @param array  $attr      Attributes of the shortcode. @see wp_audio_shortcode()
         * @param string $content   Shortcode content.
         * @param int    $instances Unique numeric ID of this audio shortcode instance.
         */
        $override = apply_filters( 'wp_audio_shortcode_override', '', $attr, $content, $instances );
        if ( '' !== $override ) {
                return $override;
        }

        $audio = null;

        $default_types = wp_get_audio_extensions();
        $defaults_atts = array(
                'src'      => '',
                'loop'     => '',
                'autoplay' => '',
                'preload'  => 'none'
        );
        foreach ( $default_types as $type ) {
                $defaults_atts[$type] = '';
        }

        $atts = shortcode_atts( $defaults_atts, $attr, 'audio' );

        $primary = false;
        if ( ! empty( $atts['src'] ) ) {
                $type = wp_check_filetype( $atts['src'], wp_get_mime_types() );
                if ( ! in_array( strtolower( $type['ext'] ), $default_types ) ) {
                        return sprintf( '<a class="wp-embedded-audio" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
                }
                $primary = true;
                array_unshift( $default_types, 'src' );
        } else {
                foreach ( $default_types as $ext ) {
                        if ( ! empty( $atts[ $ext ] ) ) {
                                $type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );
                                if ( strtolower( $type['ext'] ) === $ext ) {
                                        $primary = true;
                                }
                        }
                }
        }

        if ( ! $primary ) {
                $audios = get_attached_media( 'audio', $post_id );
                if ( empty( $audios ) ) {
                        return;
                }

                $audio = reset( $audios );
                $atts['src'] = wp_get_attachment_url( $audio->ID );
                if ( empty( $atts['src'] ) ) {
                        return;
                }

                array_unshift( $default_types, 'src' );
        }

        /**
         * Filter the media library used for the audio shortcode.
         *
         * @since 3.6.0
         *
         * @param string $library Media library used for the audio shortcode.
         */
        $library = apply_filters( 'wp_audio_shortcode_library', 'mediaelement' );
        if ( 'mediaelement' === $library && did_action( 'init' ) ) {
                wp_enqueue_style( 'wp-mediaelement' );
                wp_enqueue_script( 'wp-mediaelement' );
        }

        /**
         * Filter the class attribute for the audio shortcode output container.
         *
         * @since 3.6.0
         *
         * @param string $class CSS class or list of space-separated classes.
         */
        $html_atts = array(
                'class'    => apply_filters( 'wp_audio_shortcode_class', 'wp-audio-shortcode' ),
                'id'       => sprintf( 'audio-%d-%d', $post_id, $instances ),
                'loop'     => wp_validate_boolean( $atts['loop'] ),
                'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
                'preload'  => $atts['preload'],
                'style'    => 'width: 100%; visibility: hidden;',
        );

        // These ones should just be omitted altogether if they are blank
        foreach ( array( 'loop', 'autoplay', 'preload' ) as $a ) {
                if ( empty( $html_atts[$a] ) ) {
                        unset( $html_atts[$a] );
                }
        }

        $attr_strings = array();
        foreach ( $html_atts as $k => $v ) {
                $attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
        }

        $html = '';
        if ( 'mediaelement' === $library && 1 === $instances ) {
                $html .= "<!--[if lt IE 9]><script>document.createElement('audio');</script><![endif]-->\n";
        }
        $html .= sprintf( '<audio %s controls="controls">', join( ' ', $attr_strings ) );

        $fileurl = '';
        $source = '<source type="%s" src="%s" />';
        foreach ( $default_types as $fallback ) {
                if ( ! empty( $atts[ $fallback ] ) ) {
                        if ( empty( $fileurl ) ) {
                                $fileurl = $atts[ $fallback ];
                        }
                        $type = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
                        $url = add_query_arg( '_', $instances, $atts[ $fallback ] );
                        $html .= sprintf( $source, $type['type'], esc_url( $url ) );
                }
        }

        if ( 'mediaelement' === $library ) {
                $html .= wp_mediaelement_fallback( $fileurl );
        }
        $html .= '</audio>';

        /**
         * Filter the audio shortcode output.
         *
         * @since 3.6.0
         *
         * @param string $html    Audio shortcode HTML output.
         * @param array  $atts    Array of audio shortcode attributes.
         * @param string $audio   Audio file.
         * @param int    $post_id Post ID.
         * @param string $library Media library used for the audio shortcode.
         */
        return apply_filters( 'wp_audio_shortcode', $html, $atts, $audio, $post_id, $library );
}
add_shortcode( 'audio', 'wp_audio_shortcode' );

/**
 * Return a filtered list of WP-supported video formats
 *
 * @since 3.6.0
 * @return array
 */
function wp_get_video_extensions() {
        /**
         * Filter the list of supported video formats.
         *
         * @since 3.6.0
         *
         * @param array $extensions An array of support video formats. Defaults are
         *                          'mp4', 'm4v', 'webm', 'ogv', 'wmv', 'flv'.
         */
        return apply_filters( 'wp_video_extensions', array( 'mp4', 'm4v', 'webm', 'ogv', 'wmv', 'flv' ) );
}

/**
 * The Video shortcode.
 *
 * This implements the functionality of the Video Shortcode for displaying
 * WordPress mp4s in a post.
 *
 * @since 3.6.0
 *
 * @param array $attr {
 *     Attributes of the shortcode.
 *
 *     @type string $src      URL to the source of the video file. Default empty.
 *     @type int    $height   Height of the video embed in pixels. Default 360.
 *     @type int    $width    Width of the video embed in pixels. Default $content_width or 640.
 *     @type string $poster   The 'poster' attribute for the `<video>` element. Default empty.
 *     @type string $loop     The 'loop' attribute for the `<video>` element. Default empty.
 *     @type string $autoplay The 'autoplay' attribute for the `<video>` element. Default empty.
 *     @type string $preload  The 'preload' attribute for the `<video>` element.
 *                            Default 'metadata'.
 *     @type string $class    The 'class' attribute for the `<video>` element.
 *                            Default 'wp-video-shortcode'.
 *     @type string $id       The 'id' attribute for the `<video>` element.
 *                            Default 'video-{$post_id}-{$instances}'.
 * }
 * @param string $content Optional. Shortcode content.
 * @return string HTML content to display video.
 */
function wp_video_shortcode( $attr, $content = '' ) {
        global $content_width;
        $post_id = get_post() ? get_the_ID() : 0;

        static $instances = 0;
        $instances++;

        /**
         * Filter the default video shortcode output.
         *
         * If the filtered output isn't empty, it will be used instead of generating
         * the default video template.
         *
         * @since 3.6.0
         *
         * @see wp_video_shortcode()
         *
         * @param string $html      Empty variable to be replaced with shortcode markup.
         * @param array  $attr      Attributes of the video shortcode.
         * @param string $content   Video shortcode content.
         * @param int    $instances Unique numeric ID of this video shortcode instance.
         */
        $override = apply_filters( 'wp_video_shortcode_override', '', $attr, $content, $instances );
        if ( '' !== $override ) {
                return $override;
        }

        $video = null;

        $default_types = wp_get_video_extensions();
        $defaults_atts = array(
                'src'      => '',
                'poster'   => '',
                'loop'     => '',
                'autoplay' => '',
                'preload'  => 'metadata',
                'width'    => 640,
                'height'   => 360,
        );

        foreach ( $default_types as $type ) {
                $defaults_atts[$type] = '';
        }

        $atts = shortcode_atts( $defaults_atts, $attr, 'video' );

        if ( is_admin() ) {
                // shrink the video so it isn't huge in the admin
                if ( $atts['width'] > $defaults_atts['width'] ) {
                        $atts['height'] = round( ( $atts['height'] * $defaults_atts['width'] ) / $atts['width'] );
                        $atts['width'] = $defaults_atts['width'];
                }
        } else {
                // if the video is bigger than the theme
                if ( ! empty( $content_width ) && $atts['width'] > $content_width ) {
                        $atts['height'] = round( ( $atts['height'] * $content_width ) / $atts['width'] );
                        $atts['width'] = $content_width;
                }
        }

        $yt_pattern = '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#';

        $primary = false;
        if ( ! empty( $atts['src'] ) ) {
                if ( ! preg_match( $yt_pattern, $atts['src'] ) ) {
                        $type = wp_check_filetype( $atts['src'], wp_get_mime_types() );
                        if ( ! in_array( strtolower( $type['ext'] ), $default_types ) ) {
                                return sprintf( '<a class="wp-embedded-video" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
                        }
                }
                $primary = true;
                array_unshift( $default_types, 'src' );
        } else {
                foreach ( $default_types as $ext ) {
                        if ( ! empty( $atts[ $ext ] ) ) {
                                $type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );
                                if ( strtolower( $type['ext'] ) === $ext ) {
                                        $primary = true;
                                }
                        }
                }
        }

        if ( ! $primary ) {
                $videos = get_attached_media( 'video', $post_id );
                if ( empty( $videos ) ) {
                        return;
                }

                $video = reset( $videos );
                $atts['src'] = wp_get_attachment_url( $video->ID );
                if ( empty( $atts['src'] ) ) {
                        return;
                }

                array_unshift( $default_types, 'src' );
        }

        /**
         * Filter the media library used for the video shortcode.
         *
         * @since 3.6.0
         *
         * @param string $library Media library used for the video shortcode.
         */
        $library = apply_filters( 'wp_video_shortcode_library', 'mediaelement' );
        if ( 'mediaelement' === $library && did_action( 'init' ) ) {
                wp_enqueue_style( 'wp-mediaelement' );
                wp_enqueue_script( 'wp-mediaelement' );
        }

        /**
         * Filter the class attribute for the video shortcode output container.
         *
         * @since 3.6.0
         *
         * @param string $class CSS class or list of space-separated classes.
         */
        $html_atts = array(
                'class'    => apply_filters( 'wp_video_shortcode_class', 'wp-video-shortcode' ),
                'id'       => sprintf( 'video-%d-%d', $post_id, $instances ),
                'width'    => absint( $atts['width'] ),
                'height'   => absint( $atts['height'] ),
                'poster'   => esc_url( $atts['poster'] ),
                'loop'     => wp_validate_boolean( $atts['loop'] ),
                'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
                'preload'  => $atts['preload'],
        );

        // These ones should just be omitted altogether if they are blank
        foreach ( array( 'poster', 'loop', 'autoplay', 'preload' ) as $a ) {
                if ( empty( $html_atts[$a] ) ) {
                        unset( $html_atts[$a] );
                }
        }

        $attr_strings = array();
        foreach ( $html_atts as $k => $v ) {
                $attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
        }

        $html = '';
        if ( 'mediaelement' === $library && 1 === $instances ) {
                $html .= "<!--[if lt IE 9]><script>document.createElement('video');</script><![endif]-->\n";
        }
        $html .= sprintf( '<video %s controls="controls">', join( ' ', $attr_strings ) );

        $fileurl = '';
        $source = '<source type="%s" src="%s" />';
        foreach ( $default_types as $fallback ) {
                if ( ! empty( $atts[ $fallback ] ) ) {
                        if ( empty( $fileurl ) ) {
                                $fileurl = $atts[ $fallback ];
                        }
                        if ( 'src' === $fallback && preg_match( $yt_pattern, $atts['src'] ) ) {
                                $type = array( 'type' => 'video/youtube' );
                        } else {
                                $type = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
                        }
                        $url = add_query_arg( '_', $instances, $atts[ $fallback ] );
                        $html .= sprintf( $source, $type['type'], esc_url( $url ) );
                }
        }

        if ( ! empty( $content ) ) {
                if ( false !== strpos( $content, "\n" ) ) {
                        $content = str_replace( array( "\r\n", "\n", "\t" ), '', $content );
                }
                $html .= trim( $content );
        }

        if ( 'mediaelement' === $library ) {
                $html .= wp_mediaelement_fallback( $fileurl );
        }
        $html .= '</video>';

        $width_rule = '';
        if ( ! empty( $atts['width'] ) ) {
                $width_rule = sprintf( 'width: %dpx; ', $atts['width'] );
        }
        $output = sprintf( '<div style="%s" class="wp-video">%s</div>', $width_rule, $html );

        /**
         * Filter the output of the video shortcode.
         *
         * @since 3.6.0
         *
         * @param string $output  Video shortcode HTML output.
         * @param array  $atts    Array of video shortcode attributes.
         * @param string $video   Video file.
         * @param int    $post_id Post ID.
         * @param string $library Media library used for the video shortcode.
         */
        return apply_filters( 'wp_video_shortcode', $output, $atts, $video, $post_id, $library );
}
add_shortcode( 'video', 'wp_video_shortcode' );

/**
 * Display previous image link that has the same post parent.
 *
 * @since 2.5.0
 * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
 * @param string $text Optional, default is false. If included, link will reflect $text variable.
 * @return string HTML content.
 */
function previous_image_link($size = 'thumbnail', $text = false) {
        adjacent_image_link(true, $size, $text);
}

/**
 * Display next image link that has the same post parent.
 *
 * @since 2.5.0
 * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
 * @param string $text Optional, default is false. If included, link will reflect $text variable.
 * @return string HTML content.
 */
function next_image_link($size = 'thumbnail', $text = false) {
        adjacent_image_link(false, $size, $text);
}

/**
 * Display next or previous image link that has the same post parent.
 *
 * Retrieves the current attachment object from the $post global.
 *
 * @since 2.5.0
 *
 * @param bool $prev Optional. Default is true to display previous link, false for next.
 */
function adjacent_image_link($prev = true, $size = 'thumbnail', $text = false) {
        $post = get_post();
        $attachments = array_values( get_children( array( 'post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID' ) ) );

        foreach ( $attachments as $k => $attachment ) {
                if ( $attachment->ID == $post->ID ) {
                        break;
                }
        }

        $output = '';
        $attachment_id = 0;

        if ( $attachments ) {
                $k = $prev ? $k - 1 : $k + 1;

                if ( isset( $attachments[ $k ] ) ) {
                        $attachment_id = $attachments[ $k ]->ID;
                        $output = wp_get_attachment_link( $attachment_id, $size, true, false, $text );
                }
        }

        $adjacent = $prev ? 'previous' : 'next';

        /**
         * Filter the adjacent image link.
         *
         * The dynamic portion of the hook name, `$adjacent`, refers to the type of adjacency,
         * either 'next', or 'previous'.
         *
         * @since 3.5.0
         *
         * @param string $output        Adjacent image HTML markup.
         * @param int    $attachment_id Attachment ID
         * @param string $size          Image size.
         * @param string $text          Link text.
         */
        echo apply_filters( "{$adjacent}_image_link", $output, $attachment_id, $size, $text );
}

/**
 * Retrieve taxonomies attached to the attachment.
 *
 * @since 2.5.0
 *
 * @param int|array|object $attachment Attachment ID, Attachment data array, or Attachment data object.
 * @return array Empty array on failure. List of taxonomies on success.
 */
function get_attachment_taxonomies($attachment) {
        if ( is_int( $attachment ) )
                $attachment = get_post($attachment);
        else if ( is_array($attachment) )
                $attachment = (object) $attachment;

        if ( ! is_object($attachment) )
                return array();

        $filename = basename($attachment->guid);

        $objects = array('attachment');

        if ( false !== strpos($filename, '.') )
                $objects[] = 'attachment:' . substr($filename, strrpos($filename, '.') + 1);
        if ( !empty($attachment->post_mime_type) ) {
                $objects[] = 'attachment:' . $attachment->post_mime_type;
                if ( false !== strpos($attachment->post_mime_type, '/') )
                        foreach ( explode('/', $attachment->post_mime_type) as $token )
                                if ( !empty($token) )
                                        $objects[] = "attachment:$token";
        }

        $taxonomies = array();
        foreach ( $objects as $object )
                if ( $taxes = get_object_taxonomies($object) )
                        $taxonomies = array_merge($taxonomies, $taxes);

        return array_unique($taxonomies);
}

/**
 * Return all of the taxonomy names that are registered for attachments.
 *
 * Handles mime-type-specific taxonomies such as attachment:image and attachment:video.
 *
 * @since 3.5.0
 * @see get_attachment_taxonomies()
 *
 * @param string $output The type of output to return, either taxonomy 'names' or 'objects'. 'names' is the default.
 * @return array The names of all taxonomy of $object_type.
 */
function get_taxonomies_for_attachments( $output = 'names' ) {
        $taxonomies = array();
        foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy ) {
                foreach ( $taxonomy->object_type as $object_type ) {
                        if ( 'attachment' == $object_type || 0 === strpos( $object_type, 'attachment:' ) ) {
                                if ( 'names' == $output )
                                        $taxonomies[] = $taxonomy->name;
                                else
                                        $taxonomies[ $taxonomy->name ] = $taxonomy;
                                break;
                        }
                }
        }

        return $taxonomies;
}

/**
 * Create new GD image resource with transparency support
 * @TODO: Deprecate if possible.
 *
 * @since 2.9.0
 *
 * @param int $width Image width
 * @param int $height Image height
 * @return resource resource
 */
function wp_imagecreatetruecolor($width, $height) {
        $img = imagecreatetruecolor($width, $height);
        if ( is_resource($img) && function_exists('imagealphablending') && function_exists('imagesavealpha') ) {
                imagealphablending($img, false);
                imagesavealpha($img, true);
        }
        return $img;
}

/**
 * Register an embed handler. This function should probably only be used for sites that do not support oEmbed.
 *
 * @since 2.9.0
 * @see WP_Embed::register_handler()
 *
 * @global WP_Embed $wp_embed
 * @param string   $id
 * @param string   $regex
 * @param callable $callback
 * @param int      $priority
 */
function wp_embed_register_handler( $id, $regex, $callback, $priority = 10 ) {
        global $wp_embed;
        $wp_embed->register_handler( $id, $regex, $callback, $priority );
}

/**
 * Unregister a previously registered embed handler.
 *
 * @since 2.9.0
 * @see WP_Embed::unregister_handler()
 *
 * @global WP_Embed $wp_embed
 * @param string $id
 * @param int    $priority
 */
function wp_embed_unregister_handler( $id, $priority = 10 ) {
        global $wp_embed;
        $wp_embed->unregister_handler( $id, $priority );
}

/**
 * Create default array of embed parameters.
 *
 * The width defaults to the content width as specified by the theme. If the
 * theme does not specify a content width, then 500px is used.
 *
 * The default height is 1.5 times the width, or 1000px, whichever is smaller.
 *
 * The 'embed_defaults' filter can be used to adjust either of these values.
 *
 * @since 2.9.0
 *
 * @param string $url Optional. The URL that should be embedded. Default empty.
 *
 * @return array Default embed parameters.
 */
function wp_embed_defaults( $url = '' ) {
        if ( ! empty( $GLOBALS['content_width'] ) )
                $width = (int) $GLOBALS['content_width'];

        if ( empty( $width ) )
                $width = 500;

        $height = min( ceil( $width * 1.5 ), 1000 );

        /**
         * Filter the default array of embed dimensions.
         *
         * @since 2.9.0
         *
         * @param int    $width  Width of the embed in pixels.
         * @param int    $height Height of the embed in pixels.
         * @param string $url    The URL that should be embedded.
         */
        return apply_filters( 'embed_defaults', compact( 'width', 'height' ), $url );
}

/**
 * Based on a supplied width/height example, return the biggest possible dimensions based on the max width/height.
 *
 * @since 2.9.0
 *
 * @param int $example_width The width of an example embed.
 * @param int $example_height The height of an example embed.
 * @param int $max_width The maximum allowed width.
 * @param int $max_height The maximum allowed height.
 * @return array The maximum possible width and height based on the example ratio.
 */
function wp_expand_dimensions( $example_width, $example_height, $max_width, $max_height ) {
        $example_width  = (int) $example_width;
        $example_height = (int) $example_height;
        $max_width      = (int) $max_width;
        $max_height     = (int) $max_height;

        return wp_constrain_dimensions( $example_width * 1000000, $example_height * 1000000, $max_width, $max_height );
}

/**
 * Attempts to fetch the embed HTML for a provided URL using oEmbed.
 *
 * @since 2.9.0
 * @see WP_oEmbed
 *
 * @param string $url The URL that should be embedded.
 * @param array $args Additional arguments and parameters.
 * @return false|string False on failure or the embed HTML on success.
 */
function wp_oembed_get( $url, $args = '' ) {
        require_once( ABSPATH . WPINC . '/class-oembed.php' );
        $oembed = _wp_oembed_get_object();
        return $oembed->get_html( $url, $args );
}

/**
 * Adds a URL format and oEmbed provider URL pair.
 *
 * @since 2.9.0
 * @see WP_oEmbed
 *
 * @param string $format The format of URL that this provider can handle. You can use asterisks as wildcards.
 * @param string $provider The URL to the oEmbed provider.
 * @param boolean $regex Whether the $format parameter is in a regex format.
 */
function wp_oembed_add_provider( $format, $provider, $regex = false ) {
        require_once( ABSPATH . WPINC . '/class-oembed.php' );

        if ( did_action( 'plugins_loaded' ) ) {
                $oembed = _wp_oembed_get_object();
                $oembed->providers[$format] = array( $provider, $regex );
        } else {
                WP_oEmbed::_add_provider_early( $format, $provider, $regex );
        }
}

/**
 * Removes an oEmbed provider.
 *
 * @since 3.5.0
 * @see WP_oEmbed
 *
 * @param string $format The URL format for the oEmbed provider to remove.
 */
function wp_oembed_remove_provider( $format ) {
        require_once( ABSPATH . WPINC . '/class-oembed.php' );

        if ( did_action( 'plugins_loaded' ) ) {
                $oembed = _wp_oembed_get_object();

                if ( isset( $oembed->providers[ $format ] ) ) {
                        unset( $oembed->providers[ $format ] );
                        return true;
                }
        } else {
                WP_oEmbed::_remove_provider_early( $format );
        }

        return false;
}

/**
 * Determines if default embed handlers should be loaded.
 *
 * Checks to make sure that the embeds library hasn't already been loaded. If
 * it hasn't, then it will load the embeds library.
 *
 * @since 2.9.0
 */
function wp_maybe_load_embeds() {
        /**
         * Filter whether to load the default embed handlers.
         *
         * Returning a falsey value will prevent loading the default embed handlers.
         *
         * @since 2.9.0
         *
         * @param bool $maybe_load_embeds Whether to load the embeds library. Default true.
         */
        if ( ! apply_filters( 'load_default_embeds', true ) ) {
                return;
        }

        wp_embed_register_handler( 'youtube_embed_url', '#https?://(www.)?youtube\.com/embed/([^/]+)#i', 'wp_embed_handler_youtube' );

        wp_embed_register_handler( 'googlevideo', '#http://video\.google\.([A-Za-z.]{2,5})/videoplay\?docid=([\d-]+)(.*?)#i', 'wp_embed_handler_googlevideo' );

        /**
         * Filter the audio embed handler callback.
         *
         * @since 3.6.0
         *
         * @param callback $handler Audio embed handler callback function.
         */
        wp_embed_register_handler( 'audio', '#^https?://.+?\.(' . join( '|', wp_get_audio_extensions() ) . ')$#i', apply_filters( 'wp_audio_embed_handler', 'wp_embed_handler_audio' ), 9999 );

        /**
         * Filter the video embed handler callback.
         *
         * @since 3.6.0
         *
         * @param callback $handler Video embed handler callback function.
         */
        wp_embed_register_handler( 'video', '#^https?://.+?\.(' . join( '|', wp_get_video_extensions() ) . ')$#i', apply_filters( 'wp_video_embed_handler', 'wp_embed_handler_video' ), 9999 );
}

/**
 * The Google Video embed handler callback. Google Video does not support oEmbed.
 *
 * @see WP_Embed::register_handler()
 * @see WP_Embed::shortcode()
 *
 * @param array $matches The regex matches from the provided regex when calling {@link wp_embed_register_handler()}.
 * @param array $attr Embed attributes.
 * @param string $url The original URL that was matched by the regex.
 * @param array $rawattr The original unmodified attributes.
 * @return string The embed HTML.
 */
function wp_embed_handler_googlevideo( $matches, $attr, $url, $rawattr ) {
        // If the user supplied a fixed width AND height, use it
        if ( !empty($rawattr['width']) && !empty($rawattr['height']) ) {
                $width  = (int) $rawattr['width'];
                $height = (int) $rawattr['height'];
        } else {
                list( $width, $height ) = wp_expand_dimensions( 425, 344, $attr['width'], $attr['height'] );
        }

        /**
         * Filter the Google Video embed output.
         *
         * @since 2.9.0
         *
         * @param string $html    Google Video HTML embed markup.
         * @param array  $matches The regex matches from the provided regex.
         * @param array  $attr    An array of embed attributes.
         * @param string $url     The original URL that was matched by the regex.
         * @param array  $rawattr The original unmodified attributes.
         */
        return apply_filters( 'embed_googlevideo', '<embed type="application/x-shockwave-flash" src="http://video.google.com/googleplayer.swf?docid=' . esc_attr($matches[2]) . '&amp;hl=en&amp;fs=true" style="width:' . esc_attr($width) . 'px;height:' . esc_attr($height) . 'px" allowFullScreen="true" allowScriptAccess="always" />', $matches, $attr, $url, $rawattr );
}

/**
 * YouTube embed handler callback.
 *
 * Catches URLs that can be parsed but aren't supported by oEmbed.
 *
 * @since 4.0.0
 *
 * @param array  $matches The regex matches from the provided regex when calling
 *                        {@see wp_embed_register_handler()}.
 * @param array  $attr    Embed attributes.
 * @param string $url     The original URL that was matched by the regex.
 * @param array  $rawattr The original unmodified attributes.
 * @return string The embed HTML.
 */
function wp_embed_handler_youtube( $matches, $attr, $url, $rawattr ) {
        global $wp_embed;
        $embed = $wp_embed->autoembed( "https://youtube.com/watch?v={$matches[2]}" );
        /**
         * Filter the YoutTube embed output.
         *
         * @since 4.0.0
         *
         * @see wp_embed_handler_youtube()
         *
         * @param string $embed   YouTube embed output.
         * @param array  $attr    An array of embed attributes.
         * @param string $url     The original URL that was matched by the regex.
         * @param array  $rawattr The original unmodified attributes.
         */
        return apply_filters( 'wp_embed_handler_youtube', $embed, $attr, $url, $rawattr );
}

/**
 * Audio embed handler callback.
 *
 * @since 3.6.0
 *
 * @param array $matches The regex matches from the provided regex when calling {@link wp_embed_register_handler()}.
 * @param array $attr Embed attributes.
 * @param string $url The original URL that was matched by the regex.
 * @param array $rawattr The original unmodified attributes.
 * @return string The embed HTML.
 */
function wp_embed_handler_audio( $matches, $attr, $url, $rawattr ) {
        $audio = sprintf( '[audio src="%s" /]', esc_url( $url ) );

        /**
         * Filter the audio embed output.
         *
         * @since 3.6.0
         *
         * @param string $audio   Audio embed output.
         * @param array  $attr    An array of embed attributes.
         * @param string $url     The original URL that was matched by the regex.
         * @param array  $rawattr The original unmodified attributes.
         */
        return apply_filters( 'wp_embed_handler_audio', $audio, $attr, $url, $rawattr );
}

/**
 * Video embed handler callback.
 *
 * @since 3.6.0
 *
 * @param array $matches The regex matches from the provided regex when calling {@link wp_embed_register_handler()}.
 * @param array $attr Embed attributes.
 * @param string $url The original URL that was matched by the regex.
 * @param array $rawattr The original unmodified attributes.
 * @return string The embed HTML.
 */
function wp_embed_handler_video( $matches, $attr, $url, $rawattr ) {
        $dimensions = '';
        if ( ! empty( $rawattr['width'] ) && ! empty( $rawattr['height'] ) ) {
                $dimensions .= sprintf( 'width="%d" ', (int) $rawattr['width'] );
                $dimensions .= sprintf( 'height="%d" ', (int) $rawattr['height'] );
        }
        $video = sprintf( '[video %s src="%s" /]', $dimensions, esc_url( $url ) );

        /**
         * Filter the video embed output.
         *
         * @since 3.6.0
         *
         * @param string $video   Video embed output.
         * @param array  $attr    An array of embed attributes.
         * @param string $url     The original URL that was matched by the regex.
         * @param array  $rawattr The original unmodified attributes.
         */
        return apply_filters( 'wp_embed_handler_video', $video, $attr, $url, $rawattr );
}

/**
 * Converts a shorthand byte value to an integer byte value.
 *
 * @since 2.3.0
 *
 * @param string $size A shorthand byte value.
 * @return int An integer byte value.
 */
function wp_convert_hr_to_bytes( $size ) {
        $size  = strtolower( $size );
        $bytes = (int) $size;
        if ( strpos( $size, 'k' ) !== false )
                $bytes = intval( $size ) * 1024;
        elseif ( strpos( $size, 'm' ) !== false )
                $bytes = intval($size) * 1024 * 1024;
        elseif ( strpos( $size, 'g' ) !== false )
                $bytes = intval( $size ) * 1024 * 1024 * 1024;
        return $bytes;
}

/**
 * Determine the maximum upload size allowed in php.ini.
 *
 * @since 2.5.0
 *
 * @return int Allowed upload size.
 */
function wp_max_upload_size() {
        $u_bytes = wp_convert_hr_to_bytes( ini_get( 'upload_max_filesize' ) );
        $p_bytes = wp_convert_hr_to_bytes( ini_get( 'post_max_size' ) );

        /**
         * Filter the maximum upload size allowed in php.ini.
         *
         * @since 2.5.0
         *
         * @param int $size    Max upload size limit in bytes.
         * @param int $u_bytes Maximum upload filesize in bytes.
         * @param int $p_bytes Maximum size of POST data in bytes.
         */
        return apply_filters( 'upload_size_limit', min( $u_bytes, $p_bytes ), $u_bytes, $p_bytes );
}

/**
 * Returns a WP_Image_Editor instance and loads file into it.
 *
 * @since 3.5.0
 * @access public
 *
 * @param string $path Path to file to load
 * @param array $args Additional data. Accepts { 'mime_type'=>string, 'methods'=>{string, string, ...} }
 * @return WP_Image_Editor|WP_Error
 */
function wp_get_image_editor( $path, $args = array() ) {
        $args['path'] = $path;

        if ( ! isset( $args['mime_type'] ) ) {
                $file_info = wp_check_filetype( $args['path'] );

                // If $file_info['type'] is false, then we let the editor attempt to
                // figure out the file type, rather than forcing a failure based on extension.
                if ( isset( $file_info ) && $file_info['type'] )
                        $args['mime_type'] = $file_info['type'];
        }

        $implementation = _wp_image_editor_choose( $args );

        if ( $implementation ) {
                $editor = new $implementation( $path );
                $loaded = $editor->load();

                if ( is_wp_error( $loaded ) )
                        return $loaded;

                return $editor;
        }

        return new WP_Error( 'image_no_editor', __('No editor could be selected.') );
}

/**
 * Tests whether there is an editor that supports a given mime type or methods.
 *
 * @since 3.5.0
 * @access public
 *
 * @param string|array $args Array of requirements. Accepts { 'mime_type'=>string, 'methods'=>{string, string, ...} }
 * @return boolean true if an eligible editor is found; false otherwise
 */
function wp_image_editor_supports( $args = array() ) {
        return (bool) _wp_image_editor_choose( $args );
}

/**
 * Tests which editors are capable of supporting the request.
 *
 * @since 3.5.0
 * @access private
 *
 * @param array $args Additional data. Accepts { 'mime_type'=>string, 'methods'=>{string, string, ...} }
 * @return string|bool Class name for the first editor that claims to support the request. False if no editor claims to support the request.
 */
function _wp_image_editor_choose( $args = array() ) {
        require_once ABSPATH . WPINC . '/class-wp-image-editor.php';
        require_once ABSPATH . WPINC . '/class-wp-image-editor-gd.php';
        require_once ABSPATH . WPINC . '/class-wp-image-editor-imagick.php';

        /**
         * Filter the list of image editing library classes.
         *
         * @since 3.5.0
         *
         * @param array $image_editors List of available image editors. Defaults are
         *                             'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'.
         */
        $implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) );

        foreach ( $implementations as $implementation ) {
                if ( ! call_user_func( array( $implementation, 'test' ), $args ) )
                        continue;

                if ( isset( $args['mime_type'] ) &&
                        ! call_user_func(
                                array( $implementation, 'supports_mime_type' ),
                                $args['mime_type'] ) ) {
                        continue;
                }

                if ( isset( $args['methods'] ) &&
                         array_diff( $args['methods'], get_class_methods( $implementation ) ) ) {
                        continue;
                }

                return $implementation;
        }

        return false;
}

/**
 * Prints default plupload arguments.
 *
 * @since 3.4.0
 */
function wp_plupload_default_settings() {
        global $wp_scripts;

        $data = $wp_scripts->get_data( 'wp-plupload', 'data' );
        if ( $data && false !== strpos( $data, '_wpPluploadSettings' ) )
                return;

        $max_upload_size = wp_max_upload_size();

        $defaults = array(
                'runtimes'            => 'html5,flash,silverlight,html4',
                'file_data_name'      => 'async-upload', // key passed to $_FILE.
                'url'                 => admin_url( 'async-upload.php', 'relative' ),
                'flash_swf_url'       => includes_url( 'js/plupload/plupload.flash.swf' ),
                'silverlight_xap_url' => includes_url( 'js/plupload/plupload.silverlight.xap' ),
                'filters' => array(
                        'max_file_size'   => $max_upload_size . 'b',
                ),
        );

        // Currently only iOS Safari supports multiple files uploading but iOS 7.x has a bug that prevents uploading of videos
        // when enabled. See #29602.
        if ( wp_is_mobile() && strpos( $_SERVER['HTTP_USER_AGENT'], 'OS 7_' ) !== false &&
                strpos( $_SERVER['HTTP_USER_AGENT'], 'like Mac OS X' ) !== false ) {

                $defaults['multi_selection'] = false;
        }

        /**
         * Filter the Plupload default settings.
         *
         * @since 3.4.0
         *
         * @param array $defaults Default Plupload settings array.
         */
        $defaults = apply_filters( 'plupload_default_settings', $defaults );

        $params = array(
                'action' => 'upload-attachment',
        );

        /**
         * Filter the Plupload default parameters.
         *
         * @since 3.4.0
         *
         * @param array $params Default Plupload parameters array.
         */
        $params = apply_filters( 'plupload_default_params', $params );
        $params['_wpnonce'] = wp_create_nonce( 'media-form' );
        $defaults['multipart_params'] = $params;

        $settings = array(
                'defaults' => $defaults,
                'browser'  => array(
                        'mobile'    => wp_is_mobile(),
                        'supported' => _device_can_upload(),
                ),
                'limitExceeded' => is_multisite() && ! is_upload_space_available()
        );

        $script = 'var _wpPluploadSettings = ' . wp_json_encode( $settings ) . ';';

        if ( $data )
                $script = "$data\n$script";

        $wp_scripts->add_data( 'wp-plupload', 'data', $script );
}
add_action( 'customize_controls_enqueue_scripts', 'wp_plupload_default_settings' );

/**
 * Prepares an attachment post object for JS, where it is expected
 * to be JSON-encoded and fit into an Attachment model.
 *
 * @since 3.5.0
 *
 * @param mixed $attachment Attachment ID or object.
 * @return array Array of attachment details.
 */
function wp_prepare_attachment_for_js( $attachment ) {
        if ( ! $attachment = get_post( $attachment ) )
                return;

        if ( 'attachment' != $attachment->post_type )
                return;

        $meta = wp_get_attachment_metadata( $attachment->ID );
        if ( false !== strpos( $attachment->post_mime_type, '/' ) )
                list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
        else
                list( $type, $subtype ) = array( $attachment->post_mime_type, '' );

        $attachment_url = wp_get_attachment_url( $attachment->ID );

        $response = array(
                'id'          => $attachment->ID,
                'title'       => $attachment->post_title,
                'filename'    => wp_basename( $attachment->guid ),
                'url'         => $attachment_url,
                'link'        => get_attachment_link( $attachment->ID ),
                'alt'         => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
                'author'      => $attachment->post_author,
                'description' => $attachment->post_content,
                'caption'     => $attachment->post_excerpt,
                'name'        => $attachment->post_name,
                'status'      => $attachment->post_status,
                'uploadedTo'  => $attachment->post_parent,
                'date'        => strtotime( $attachment->post_date_gmt ) * 1000,
                'modified'    => strtotime( $attachment->post_modified_gmt ) * 1000,
                'menuOrder'   => $attachment->menu_order,
                'mime'        => $attachment->post_mime_type,
                'type'        => $type,
                'subtype'     => $subtype,
                'icon'        => wp_mime_type_icon( $attachment->ID ),
                'dateFormatted' => mysql2date( get_option('date_format'), $attachment->post_date ),
                'nonces'      => array(
                        'update' => false,
                        'delete' => false,
                        'edit'   => false
                ),
                'editLink'   => false,
                'meta'       => false,
        );

        $author = new WP_User( $attachment->post_author );
        $response['authorName'] = $author->display_name;

        if ( $attachment->post_parent ) {
                $post_parent = get_post( $attachment->post_parent );
        } else {
                $post_parent = false;
        }

        if ( $post_parent ) {
                $parent_type = get_post_type_object( $post_parent->post_type );
                if ( $parent_type && $parent_type->show_ui && current_user_can( 'edit_post', $attachment->post_parent ) ) {
                        $response['uploadedToLink'] = get_edit_post_link( $attachment->post_parent, 'raw' );
                }
                $response['uploadedToTitle'] = $post_parent->post_title ? $post_parent->post_title : __( '(no title)' );
        }

        $attached_file = get_attached_file( $attachment->ID );
        if ( file_exists( $attached_file ) ) {
                $bytes = filesize( $attached_file );
                $response['filesizeInBytes'] = $bytes;
                $response['filesizeHumanReadable'] = size_format( $bytes );
        }

        if ( current_user_can( 'edit_post', $attachment->ID ) ) {
                $response['nonces']['update'] = wp_create_nonce( 'update-post_' . $attachment->ID );
                $response['nonces']['edit'] = wp_create_nonce( 'image_editor-' . $attachment->ID );
                $response['editLink'] = get_edit_post_link( $attachment->ID, 'raw' );
        }

        if ( current_user_can( 'delete_post', $attachment->ID ) )
                $response['nonces']['delete'] = wp_create_nonce( 'delete-post_' . $attachment->ID );

        if ( $meta && 'image' === $type ) {
                $sizes = array();

                /** This filter is documented in wp-admin/includes/media.php */
                $possible_sizes = apply_filters( 'image_size_names_choose', array(
                        'thumbnail' => __('Thumbnail'),
                        'medium'    => __('Medium'),
                        'large'     => __('Large'),
                        'full'      => __('Full Size'),
                ) );
                unset( $possible_sizes['full'] );

                // Loop through all potential sizes that may be chosen. Try to do this with some efficiency.
                // First: run the image_downsize filter. If it returns something, we can use its data.
                // If the filter does not return something, then image_downsize() is just an expensive
                // way to check the image metadata, which we do second.
                foreach ( $possible_sizes as $size => $label ) {

                        /** This filter is documented in wp-includes/media.php */
                        if ( $downsize = apply_filters( 'image_downsize', false, $attachment->ID, $size ) ) {
                                if ( ! $downsize[3] )
                                        continue;
                                $sizes[ $size ] = array(
                                        'height'      => $downsize[2],
                                        'width'       => $downsize[1],
                                        'url'         => $downsize[0],
                                        'orientation' => $downsize[2] > $downsize[1] ? 'portrait' : 'landscape',
                                );
                        } elseif ( isset( $meta['sizes'][ $size ] ) ) {
                                if ( ! isset( $base_url ) )
                                        $base_url = str_replace( wp_basename( $attachment_url ), '', $attachment_url );

                                // Nothing from the filter, so consult image metadata if we have it.
                                $size_meta = $meta['sizes'][ $size ];

                                // We have the actual image size, but might need to further constrain it if content_width is narrower.
                                // Thumbnail, medium, and full sizes are also checked against the site's height/width options.
                                list( $width, $height ) = image_constrain_size_for_editor( $size_meta['width'], $size_meta['height'], $size, 'edit' );

                                $sizes[ $size ] = array(
                                        'height'      => $height,
                                        'width'       => $width,
                                        'url'         => $base_url . $size_meta['file'],
                                        'orientation' => $height > $width ? 'portrait' : 'landscape',
                                );
                        }
                }

                $sizes['full'] = array( 'url' => $attachment_url );

                if ( isset( $meta['height'], $meta['width'] ) ) {
                        $sizes['full']['height'] = $meta['height'];
                        $sizes['full']['width'] = $meta['width'];
                        $sizes['full']['orientation'] = $meta['height'] > $meta['width'] ? 'portrait' : 'landscape';
                }

                $response = array_merge( $response, array( 'sizes' => $sizes ), $sizes['full'] );
        } elseif ( $meta && 'video' === $type ) {
                if ( isset( $meta['width'] ) )
                        $response['width'] = (int) $meta['width'];
                if ( isset( $meta['height'] ) )
                        $response['height'] = (int) $meta['height'];
        }

        if ( $meta && ( 'audio' === $type || 'video' === $type ) ) {
                if ( isset( $meta['length_formatted'] ) )
                        $response['fileLength'] = $meta['length_formatted'];

                $response['meta'] = array();
                foreach ( wp_get_attachment_id3_keys( $attachment, 'js' ) as $key => $label ) {
                        $response['meta'][ $key ] = false;

                        if ( ! empty( $meta[ $key ] ) ) {
                                $response['meta'][ $key ] = $meta[ $key ];
                        }
                }

                $id = get_post_thumbnail_id( $attachment->ID );
                if ( ! empty( $id ) ) {
                        list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'full' );
                        $response['image'] = compact( 'src', 'width', 'height' );
                        list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'thumbnail' );
                        $response['thumb'] = compact( 'src', 'width', 'height' );
                } else {
                        $src = wp_mime_type_icon( $attachment->ID );
                        $width = 48;
                        $height = 64;
                        $response['image'] = compact( 'src', 'width', 'height' );
                        $response['thumb'] = compact( 'src', 'width', 'height' );
                }
        }

        if ( function_exists('get_compat_media_markup') )
                $response['compat'] = get_compat_media_markup( $attachment->ID, array( 'in_modal' => true ) );

        /**
         * Filter the attachment data prepared for JavaScript.
         *
         * @since 3.5.0
         *
         * @param array      $response   Array of prepared attachment data.
         * @param int|object $attachment Attachment ID or object.
         * @param array      $meta       Array of attachment meta data.
         */
        return apply_filters( 'wp_prepare_attachment_for_js', $response, $attachment, $meta );
}

/**
 * Enqueues all scripts, styles, settings, and templates necessary to use
 * all media JS APIs.
 *
 * @since 3.5.0
 */
function wp_enqueue_media( $args = array() ) {

        // Enqueue me just once per page, please.
        if ( did_action( 'wp_enqueue_media' ) )
                return;

        global $content_width, $wpdb, $wp_locale;

        $defaults = array(
                'post' => null,
        );
        $args = wp_parse_args( $args, $defaults );

        // We're going to pass the old thickbox media tabs to `media_upload_tabs`
        // to ensure plugins will work. We will then unset those tabs.
        $tabs = array(
                // handler action suffix => tab label
                'type'     => '',
                'type_url' => '',
                'gallery'  => '',
                'library'  => '',
        );

        /** This filter is documented in wp-admin/includes/media.php */
        $tabs = apply_filters( 'media_upload_tabs', $tabs );
        unset( $tabs['type'], $tabs['type_url'], $tabs['gallery'], $tabs['library'] );

        $props = array(
                'link'  => get_option( 'image_default_link_type' ), // db default is 'file'
                'align' => get_option( 'image_default_align' ), // empty default
                'size'  => get_option( 'image_default_size' ),  // empty default
        );

        $exts = array_merge( wp_get_audio_extensions(), wp_get_video_extensions() );
        $mimes = get_allowed_mime_types();
        $ext_mimes = array();
        foreach ( $exts as $ext ) {
                foreach ( $mimes as $ext_preg => $mime_match ) {
                        if ( preg_match( '#' . $ext . '#i', $ext_preg ) ) {
                                $ext_mimes[ $ext ] = $mime_match;
                                break;
                        }
                }
        }

        $has_audio = $wpdb->get_var( "
                SELECT ID
                FROM $wpdb->posts
                WHERE post_type = 'attachment'
                AND post_mime_type LIKE 'audio%'
                LIMIT 1
        " );
        $has_video = $wpdb->get_var( "
                SELECT ID
                FROM $wpdb->posts
                WHERE post_type = 'attachment'
                AND post_mime_type LIKE 'video%'
                LIMIT 1
        " );
        $months = $wpdb->get_results( $wpdb->prepare( "
                SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
                FROM $wpdb->posts
                WHERE post_type = %s
                ORDER BY post_date DESC
        ", 'attachment' ) );
        foreach ( $months as $month_year ) {
                $month_year->text = sprintf( __( '%1$s %2$d' ), $wp_locale->get_month( $month_year->month ), $month_year->year );
        }

        $settings = array(
                'tabs'      => $tabs,
                'tabUrl'    => add_query_arg( array( 'chromeless' => true ), admin_url('media-upload.php') ),
                'mimeTypes' => wp_list_pluck( get_post_mime_types(), 0 ),
                /** This filter is documented in wp-admin/includes/media.php */
                'captions'  => ! apply_filters( 'disable_captions', '' ),
                'nonce'     => array(
                        'sendToEditor' => wp_create_nonce( 'media-send-to-editor' ),
                ),
                'post'    => array(
                        'id' => 0,
                ),
                'defaultProps' => $props,
                'attachmentCounts' => array(
                        'audio' => ( $has_audio ) ? 1 : 0,
                        'video' => ( $has_video ) ? 1 : 0
                ),
                'embedExts'    => $exts,
                'embedMimes'   => $ext_mimes,
                'contentWidth' => $content_width,
                'months'       => $months,
                'mediaTrash'   => MEDIA_TRASH ? 1 : 0
        );

        $post = null;
        if ( isset( $args['post'] ) ) {
                $post = get_post( $args['post'] );
                $settings['post'] = array(
                        'id' => $post->ID,
                        'nonce' => wp_create_nonce( 'update-post_' . $post->ID ),
                );

                $thumbnail_support = current_theme_supports( 'post-thumbnails', $post->post_type ) && post_type_supports( $post->post_type, 'thumbnail' );
                if ( ! $thumbnail_support && 'attachment' === $post->post_type && $post->post_mime_type ) {
                        if ( 0 === strpos( $post->post_mime_type, 'audio/' ) ) {
                                $thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
                        } elseif ( 0 === strpos( $post->post_mime_type, 'video/' ) ) {
                                $thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
                        }
                }

                if ( $thumbnail_support ) {
                        $featured_image_id = get_post_meta( $post->ID, '_thumbnail_id', true );
                        $settings['post']['featuredImageId'] = $featured_image_id ? $featured_image_id : -1;
                }
        }

        $hier = $post && is_post_type_hierarchical( $post->post_type );

        $strings = array(
                // Generic
                'url'         => __( 'URL' ),
                'addMedia'    => __( 'Add Media' ),
                'search'      => __( 'Search' ),
                'select'      => __( 'Select' ),
                'cancel'      => __( 'Cancel' ),
                'update'      => __( 'Update' ),
                'replace'     => __( 'Replace' ),
                'remove'      => __( 'Remove' ),
                'back'        => __( 'Back' ),
                /* translators: This is a would-be plural string used in the media manager.
                   If there is not a word you can use in your language to avoid issues with the
                   lack of plural support here, turn it into "selected: %d" then translate it.
                 */
                'selected'    => __( '%d selected' ),
                'dragInfo'    => __( 'Drag and drop to reorder images.' ),

                // Upload
                'uploadFilesTitle'  => __( 'Upload Files' ),
                'uploadImagesTitle' => __( 'Upload Images' ),

                // Library
                'mediaLibraryTitle'      => __( 'Media Library' ),
                'insertMediaTitle'       => __( 'Insert Media' ),
                'createNewGallery'       => __( 'Create a new gallery' ),
                'createNewPlaylist'      => __( 'Create a new playlist' ),
                'createNewVideoPlaylist' => __( 'Create a new video playlist' ),
                'returnToLibrary'        => __( '&#8592; Return to library' ),
                'allMediaItems'          => __( 'All media items' ),
                'allDates'               => __( 'All dates' ),
                'noItemsFound'           => __( 'No items found.' ),
                'insertIntoPost'         => $hier ? __( 'Insert into page' ) : __( 'Insert into post' ),
                'unattached'             => __( 'Unattached' ),
                'trash'                  => _x( 'Trash', 'noun' ),
                'uploadedToThisPost'     => $hier ? __( 'Uploaded to this page' ) : __( 'Uploaded to this post' ),
                'warnDelete'             => __( "You are about to permanently delete this item.\n  'Cancel' to stop, 'OK' to delete." ),
                'warnBulkDelete'         => __( "You are about to permanently delete these items.\n  'Cancel' to stop, 'OK' to delete." ),
                'warnBulkTrash'          => __( "You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete." ),
                'bulkSelect'             => __( 'Bulk Select' ),
                'cancelSelection'        => __( 'Cancel Selection' ),
                'trashSelected'          => __( 'Trash Selected' ),
                'untrashSelected'        => __( 'Untrash Selected' ),
                'deleteSelected'         => __( 'Delete Selected' ),
                'deletePermanently'      => __( 'Delete Permanently' ),
                'apply'                  => __( 'Apply' ),
                'filterByDate'           => __( 'Filter by date' ),
                'filterByType'           => __( 'Filter by type' ),
                'searchMediaLabel'       => __( 'Search Media' ),
                'noMedia'                => __( 'No media attachments found.' ),

                // Library Details
                'attachmentDetails'  => __( 'Attachment Details' ),

                // From URL
                'insertFromUrlTitle' => __( 'Insert from URL' ),

                // Featured Images
                'setFeaturedImageTitle' => __( 'Set Featured Image' ),
                'setFeaturedImage'    => __( 'Set featured image' ),

                // Gallery
                'createGalleryTitle' => __( 'Create Gallery' ),
                'editGalleryTitle'   => __( 'Edit Gallery' ),
                'cancelGalleryTitle' => __( '&#8592; Cancel Gallery' ),
                'insertGallery'      => __( 'Insert gallery' ),
                'updateGallery'      => __( 'Update gallery' ),
                'addToGallery'       => __( 'Add to gallery' ),
                'addToGalleryTitle'  => __( 'Add to Gallery' ),
                'reverseOrder'       => __( 'Reverse order' ),

                // Edit Image
                'imageDetailsTitle'     => __( 'Image Details' ),
                'imageReplaceTitle'     => __( 'Replace Image' ),
                'imageDetailsCancel'    => __( 'Cancel Edit' ),
                'editImage'             => __( 'Edit Image' ),

                // Crop Image
                'chooseImage' => __( 'Choose Image' ),
                'selectAndCrop' => __( 'Select and Crop' ),
                'skipCropping' => __( 'Skip Cropping' ),
                'cropImage' => __( 'Crop Image' ),
                'cropYourImage' => __( 'Crop your image' ),
                'cropping' => __( 'Cropping&hellip;' ),
                'suggestedDimensions' => __( 'Suggested image dimensions:' ),
                'cropError' => __( 'There has been an error cropping your image.' ),

                // Edit Audio
                'audioDetailsTitle'     => __( 'Audio Details' ),
                'audioReplaceTitle'     => __( 'Replace Audio' ),
                'audioAddSourceTitle'   => __( 'Add Audio Source' ),
                'audioDetailsCancel'    => __( 'Cancel Edit' ),

                // Edit Video
                'videoDetailsTitle'     => __( 'Video Details' ),
                'videoReplaceTitle'     => __( 'Replace Video' ),
                'videoAddSourceTitle'   => __( 'Add Video Source' ),
                'videoDetailsCancel'    => __( 'Cancel Edit' ),
                'videoSelectPosterImageTitle' => __( 'Select Poster Image' ),
                'videoAddTrackTitle'    => __( 'Add Subtitles' ),

                // Playlist
                'playlistDragInfo'    => __( 'Drag and drop to reorder tracks.' ),
                'createPlaylistTitle' => __( 'Create Audio Playlist' ),
                'editPlaylistTitle'   => __( 'Edit Audio Playlist' ),
                'cancelPlaylistTitle' => __( '&#8592; Cancel Audio Playlist' ),
                'insertPlaylist'      => __( 'Insert audio playlist' ),
                'updatePlaylist'      => __( 'Update audio playlist' ),
                'addToPlaylist'       => __( 'Add to audio playlist' ),
                'addToPlaylistTitle'  => __( 'Add to Audio Playlist' ),

                // Video Playlist
                'videoPlaylistDragInfo'    => __( 'Drag and drop to reorder videos.' ),
                'createVideoPlaylistTitle' => __( 'Create Video Playlist' ),
                'editVideoPlaylistTitle'   => __( 'Edit Video Playlist' ),
                'cancelVideoPlaylistTitle' => __( '&#8592; Cancel Video Playlist' ),
                'insertVideoPlaylist'      => __( 'Insert video playlist' ),
                'updateVideoPlaylist'      => __( 'Update video playlist' ),
                'addToVideoPlaylist'       => __( 'Add to video playlist' ),
                'addToVideoPlaylistTitle'  => __( 'Add to Video Playlist' ),
        );

        /**
         * Filter the media view settings.
         *
         * @since 3.5.0
         *
         * @param array   $settings List of media view settings.
         * @param WP_Post $post     Post object.
         */
        $settings = apply_filters( 'media_view_settings', $settings, $post );

        /**
         * Filter the media view strings.
         *
         * @since 3.5.0
         *
         * @param array   $strings List of media view strings.
         * @param WP_Post $post    Post object.
         */
        $strings = apply_filters( 'media_view_strings', $strings,  $post );

        $strings['settings'] = $settings;

        // Ensure we enqueue media-editor first, that way media-views is
        // registered internally before we try to localize it. see #24724.
        wp_enqueue_script( 'media-editor' );
        wp_localize_script( 'media-views', '_wpMediaViewsL10n', $strings );

        wp_enqueue_script( 'media-audiovideo' );
        wp_enqueue_style( 'media-views' );
        if ( is_admin() ) {
                wp_enqueue_script( 'mce-view' );
                wp_enqueue_script( 'image-edit' );
        }
        wp_enqueue_style( 'imgareaselect' );
        wp_plupload_default_settings();

        require_once ABSPATH . WPINC . '/media-template.php';
        add_action( 'admin_footer', 'wp_print_media_templates' );
        add_action( 'wp_footer', 'wp_print_media_templates' );
        add_action( 'customize_controls_print_footer_scripts', 'wp_print_media_templates' );

        /**
         * Fires at the conclusion of wp_enqueue_media().
         *
         * @since 3.5.0
         */
        do_action( 'wp_enqueue_media' );
}

/**
 * Retrieve media attached to the passed post.
 *
 * @since 3.6.0
 *
 * @param string      $type Mime type.
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return array Found attachments.
 */
function get_attached_media( $type, $post = 0 ) {
        if ( ! $post = get_post( $post ) )
                return array();

        $args = array(
                'post_parent' => $post->ID,
                'post_type' => 'attachment',
                'post_mime_type' => $type,
                'posts_per_page' => -1,
                'orderby' => 'menu_order',
                'order' => 'ASC',
        );

        /**
         * Filter arguments used to retrieve media attached to the given post.
         *
         * @since 3.6.0
         *
         * @param array  $args Post query arguments.
         * @param string $type Mime type of the desired media.
         * @param mixed  $post Post ID or object.
         */
        $args = apply_filters( 'get_attached_media_args', $args, $type, $post );

        $children = get_children( $args );

        /**
         * Filter the list of media attached to the given post.
         *
         * @since 3.6.0
         *
         * @param array  $children Associative array of media attached to the given post.
         * @param string $type     Mime type of the media desired.
         * @param mixed  $post     Post ID or object.
         */
        return (array) apply_filters( 'get_attached_media', $children, $type, $post );
}

/**
 * Check the content blob for an audio, video, object, embed, or iframe tags.
 *
 * @since 3.6.0
 *
 * @param string $content A string which might contain media data.
 * @param array $types array of media types: 'audio', 'video', 'object', 'embed', or 'iframe'
 * @return array A list of found HTML media embeds
 */
function get_media_embedded_in_content( $content, $types = null ) {
        $html = array();
        $allowed_media_types = array( 'audio', 'video', 'object', 'embed', 'iframe' );
        if ( ! empty( $types ) ) {
                if ( ! is_array( $types ) )
                        $types = array( $types );
                $allowed_media_types = array_intersect( $allowed_media_types, $types );
        }

        foreach ( $allowed_media_types as $tag ) {
                if ( preg_match( '#' . get_tag_regex( $tag ) . '#', $content, $matches ) ) {
                        $html[] = $matches[0];
                }
        }

        return $html;
}

/**
 * Retrieve galleries from the passed post's content.
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or object.
 * @param bool        $html Whether to return HTML or data in the array.
 * @return array A list of arrays, each containing gallery data and srcs parsed
 *                       from the expanded shortcode.
 */
function get_post_galleries( $post, $html = true ) {
        if ( ! $post = get_post( $post ) )
                return array();

        if ( ! has_shortcode( $post->post_content, 'gallery' ) )
                return array();

        $galleries = array();
        if ( preg_match_all( '/' . get_shortcode_regex() . '/s', $post->post_content, $matches, PREG_SET_ORDER ) ) {
                foreach ( $matches as $shortcode ) {
                        if ( 'gallery' === $shortcode[2] ) {
                                $srcs = array();

                                $gallery = do_shortcode_tag( $shortcode );
                                if ( $html ) {
                                        $galleries[] = $gallery;
                                } else {
                                        preg_match_all( '#src=([\'"])(.+?)\1#is', $gallery, $src, PREG_SET_ORDER );
                                        if ( ! empty( $src ) ) {
                                                foreach ( $src as $s )
                                                        $srcs[] = $s[2];
                                        }

                                        $data = shortcode_parse_atts( $shortcode[3] );
                                        $data['src'] = array_values( array_unique( $srcs ) );
                                        $galleries[] = $data;
                                }
                        }
                }
        }

        /**
         * Filter the list of all found galleries in the given post.
         *
         * @since 3.6.0
         *
         * @param array   $galleries Associative array of all found post galleries.
         * @param WP_Post $post      Post object.
         */
        return apply_filters( 'get_post_galleries', $galleries, $post );
}

/**
 * Check a specified post's content for gallery and, if present, return the first
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @param bool        $html Whether to return HTML or data.
 * @return string|array Gallery data and srcs parsed from the expanded shortcode.
 */
function get_post_gallery( $post = 0, $html = true ) {
        $galleries = get_post_galleries( $post, $html );
        $gallery = reset( $galleries );

        /**
         * Filter the first-found post gallery.
         *
         * @since 3.6.0
         *
         * @param array       $gallery   The first-found post gallery.
         * @param int|WP_Post $post      Post ID or object.
         * @param array       $galleries Associative array of all found post galleries.
         */
        return apply_filters( 'get_post_gallery', $gallery, $post, $galleries );
}

/**
 * Retrieve the image srcs from galleries from a post's content, if present
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return array A list of lists, each containing image srcs parsed.
 *              from an expanded shortcode
 */
function get_post_galleries_images( $post = 0 ) {
        $galleries = get_post_galleries( $post, false );
        return wp_list_pluck( $galleries, 'src' );
}

/**
 * Check a post's content for galleries and return the image srcs for the first found gallery
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return array A list of a gallery's image srcs in order.
 */
function get_post_gallery_images( $post = 0 ) {
        $gallery = get_post_gallery( $post, false );
        return empty( $gallery['src'] ) ? array() : $gallery['src'];
}

/**
 * Maybe attempt to generate attachment metadata, if missing.
 *
 * @since 3.9.0
 *
 * @param WP_Post $attachment Attachment object.
 */
function wp_maybe_generate_attachment_metadata( $attachment ) {
        if ( empty( $attachment ) || ( empty( $attachment->ID ) || ! $attachment_id = (int) $attachment->ID ) ) {
                return;
        }

        $file = get_attached_file( $attachment_id );
        $meta = wp_get_attachment_metadata( $attachment_id );
        if ( empty( $meta ) && file_exists( $file ) ) {
                $_meta = get_post_meta( $attachment_id );
                $regeneration_lock = 'wp_generating_att_' . $attachment_id;
                if ( ! array_key_exists( '_wp_attachment_metadata', $_meta ) && ! get_transient( $regeneration_lock ) ) {
                        set_transient( $regeneration_lock, $file );
                        wp_update_attachment_metadata( $attachment_id, wp_generate_attachment_metadata( $attachment_id, $file ) );
                        delete_transient( $regeneration_lock );
                }
        }
}

/**
 * Try to convert an attachment URL into a post ID.
 *
 * @since 4.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $url The URL to resolve.
 * @return int The found post ID.
 */
function attachment_url_to_postid( $url ) {
        global $wpdb;

        $dir = wp_upload_dir();
        $path = $url;

        if ( 0 === strpos( $path, $dir['baseurl'] . '/' ) ) {
                $path = substr( $path, strlen( $dir['baseurl'] . '/' ) );
        }

        $sql = $wpdb->prepare(
                "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attached_file' AND meta_value = %s",
                $path
        );
        $post_id = $wpdb->get_var( $sql );
        if ( ! empty( $post_id ) ) {
                return (int) $post_id;
        }
}

/**
 * Return the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view.
 *
 * @since 4.0.0
 *
 * @global $wp_version
 *
 * @return array The relevant CSS file URLs.
 */
function wpview_media_sandbox_styles() {
        $version = 'ver=' . $GLOBALS['wp_version'];
        $mediaelement = includes_url( "js/mediaelement/mediaelementplayer.min.css?$version" );
        $wpmediaelement = includes_url( "js/mediaelement/wp-mediaelement.css?$version" );

        return array( $mediaelement, $wpmediaelement );
}