/wp-includes/media.php

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<?php

/**

 * WordPress API for media display.

 *

 * @package WordPress

 */



/**

 * 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, '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

 * @uses wp_constrain_dimensions() This function passes the widths and the heights.

 *

 * @param int $width Width of the image

 * @param int $height Height of the image

 * @param string|array $size Size of what the result image should be.

 * @return array Width and height of what the result image should resize to.

 */

function image_constrain_size_for_editor($width, $height, $size = 'medium') {

	global $content_width, $_wp_additional_image_sizes;



	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 && is_admin() ) // 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;

	}



	list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size );



	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

 * @uses apply_filters() Calls 'image_downsize' on $id and $size to provide

 *		resize services.

 *

 * @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;



	$img_url = wp_get_attachment_url($id);

	$meta = wp_get_attachment_metadata($id);

	$width = $height = 0;

	$is_intermediate = false;

	$img_url_basename = wp_basename($img_url);



	// plugins can use this to provide resize services

	if ( $out = apply_filters('image_downsize', false, $id, $size) )

		return $out;



	// 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;



}



/**

 * Registers a new image size

 */

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' => (bool) $crop );

}



/**

 * Registers an image size for the post thumbnail

 */

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

 *

 * @uses apply_filters() The 'get_image_tag_class' filter is the IMG element

 *		class attribute.

 * @uses apply_filters() The 'get_image_tag' filter is the full IMG element with

 *		all attributes.

 *

 * @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);



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

	$class = apply_filters('get_image_tag_class', $class, $id, $align, $size);



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



	$html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );



	return $html;

}



/**

 * Load an image from a string, if PHP supports it.

 *

 * @since 2.1.0

 *

 * @param string $file Filename of the image to load.

 * @return resource The resulting image resource on success, Error string on failure.

 */

function wp_load_image( $file ) {

	if ( is_numeric( $file ) )

		$file = get_attached_file( $file );



	if ( ! file_exists( $file ) )

		return sprintf(__('File &#8220;%s&#8221; doesn&#8217;t exist?'), $file);



	if ( ! function_exists('imagecreatefromstring') )

		return __('The GD image library is not installed.');



	// Set artificially high because GD uses uncompressed images in memory

	@ini_set( 'memory_limit', apply_filters( 'image_memory_limit', WP_MAX_MEMORY_LIMIT ) );

	$image = imagecreatefromstring( file_get_contents( $file ) );



	if ( !is_resource( $image ) )

		return sprintf(__('File &#8220;%s&#8221; is not an image.'), $file);



	return $image;

}



/**

 * Calculates the new dimentions 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 ( intval( $current_width * $larger_ratio ) > $max_width || intval( $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;



	$w = intval( $current_width  * $ratio );

	$h = intval( $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. Contraining 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

	if ( $did_width && $w == $max_width - 1 )

		$w = $max_width; // Round it up

	if ( $did_height && $h == $max_height - 1 )

		$h = $max_height; // Round it up



	return array( $w, $h );

}



/**

 * Retrieve calculated resized dimensions for use in imagecopyresampled().

 *

 * Calculate dimensions and coordinates for a resized image that fits within a

 * specified width and height. If $crop is true, the largest matching central

 * portion of the image will be cropped out and resized to the required size.

 *

 * @since 2.5.0

 *

 * @param int $orig_w Original width.

 * @param int $orig_h Original height.

 * @param int $dest_w New width.

 * @param int $dest_h New height.

 * @param bool $crop Optional, default is false. Whether to crop image or resize.

 * @return bool|array False, on failure. Returned array matches parameters for imagecopyresampled() PHP function.

 */

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;



	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 ) {

			$new_w = intval($new_h * $aspect_ratio);

		}



		if ( !$new_h ) {

			$new_h = intval($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);



		$s_x = floor( ($orig_w - $crop_w) / 2 );

		$s_y = floor( ($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 )

		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 );



}



/**

 * Scale down an image to fit a particular size and save a new copy of the image.

 *

 * The PNG transparency will be preserved using the function, as well as the

 * image type. If the file going in is PNG, then the resized image is going to

 * be PNG. The only supported image types are PNG, GIF, and JPEG.

 *

 * Some functionality requires API to exist, so some PHP version may lose out

 * support. This is not the fault of WordPress (where functionality is

 * downgraded, not actual defects), but of your PHP version.

 *

 * @since 2.5.0

 *

 * @param string $file Image file path.

 * @param int $max_w Maximum width to resize to.

 * @param int $max_h Maximum height to resize to.

 * @param bool $crop Optional. Whether to crop image or resize.

 * @param string $suffix Optional. File Suffix.

 * @param string $dest_path Optional. New image file path.

 * @param int $jpeg_quality Optional, default is 90. Image quality percentage.

 * @return mixed WP_Error on failure. String with new destination path.

 */

function image_resize( $file, $max_w, $max_h, $crop = false, $suffix = null, $dest_path = null, $jpeg_quality = 90 ) {



	$image = wp_load_image( $file );

	if ( !is_resource( $image ) )

		return new WP_Error( 'error_loading_image', $image, $file );



	$size = @getimagesize( $file );

	if ( !$size )

		return new WP_Error('invalid_image', __('Could not read image size'), $file);

	list($orig_w, $orig_h, $orig_type) = $size;



	$dims = image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop);

	if ( !$dims )

		return new WP_Error( 'error_getting_dimensions', __('Could not calculate resized image dimensions') );

	list($dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) = $dims;



	$newimage = wp_imagecreatetruecolor( $dst_w, $dst_h );



	imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);



	// convert from full colors to index colors, like original PNG.

	if ( IMAGETYPE_PNG == $orig_type && function_exists('imageistruecolor') && !imageistruecolor( $image ) )

		imagetruecolortopalette( $newimage, false, imagecolorstotal( $image ) );



	// we don't need the original in memory anymore

	imagedestroy( $image );



	// $suffix will be appended to the destination filename, just before the extension

	if ( !$suffix )

		$suffix = "{$dst_w}x{$dst_h}";



	$info = pathinfo($file);

	$dir = $info['dirname'];

	$ext = $info['extension'];

	$name = wp_basename($file, ".$ext");



	if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) )

		$dir = $_dest_path;

	$destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";



	if ( IMAGETYPE_GIF == $orig_type ) {

		if ( !imagegif( $newimage, $destfilename ) )

			return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));

	} elseif ( IMAGETYPE_PNG == $orig_type ) {

		if ( !imagepng( $newimage, $destfilename ) )

			return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));

	} else {

		// all other formats are converted to jpg

		$destfilename = "{$dir}/{$name}-{$suffix}.jpg";

		if ( !imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) ) )

			return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));

	}



	imagedestroy( $newimage );



	// Set correct file permissions

	$stat = stat( dirname( $destfilename ));

	$perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits

	@ chmod( $destfilename, $perms );



	return $destfilename;

}



/**

 * 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 ) {

		$resized_file = image_resize($file, $width, $height, $crop);

		if ( !is_wp_error($resized_file) && $resized_file && $info = getimagesize($resized_file) ) {

			$resized_file = apply_filters('image_make_intermediate_size', $resized_file);

			return array(

				'file' => wp_basename( $resized_file ),

				'width' => $info[0],

				'height' => $info[1],

			);

		}

	}

	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 ) );



	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) ) {

		$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );

		$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.

 *

 * @see add_image_size()

 * @uses apply_filters() Calls 'wp_get_attachment_image_attributes' hook on attributes array

 * @uses wp_get_attachment_image_src() Gets attachment file URL and dimensions

 * @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 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);

		if ( is_array($size) )

			$size = join('x', $size);

		$attachment =& get_post($attachment_id);

		$default_attr = array(

			'src'	=> $src,

			'class'	=> "attachment-$size",

			'alt'	=> trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )), // Use Alt field first

			'title'	=> trim(strip_tags( $attachment->post_title )),

		);

		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);

		$attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment );

		$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 thumbnail 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 thumbnail 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 attributed to the shortcode.

 * @param string $content Optional. Shortcode content.

 * @return string

 */

function img_caption_shortcode($attr, $content = null) {



	// Allow plugins/themes to override the default caption template.

	$output = apply_filters('img_caption_shortcode', '', $attr, $content);

	if ( $output != '' )

		return $output;



	extract(shortcode_atts(array(

		'id'	=> '',

		'align'	=> 'alignnone',

		'width'	=> '',

		'caption' => ''

	), $attr));



	if ( 1 > (int) $width || empty($caption) )

		return $content;



	if ( $id ) $id = 'id="' . esc_attr($id) . '" ';



	return '<div ' . $id . 'class="wp-caption ' . esc_attr($align) . '" style="width: ' . (10 + (int) $width) . 'px">'

	. do_shortcode( $content ) . '<p class="wp-caption-text">' . $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 attributed to the shortcode.

 * @return string HTML content to display gallery.

 */

function gallery_shortcode($attr) {

	global $post, $wp_locale;



	static $instance = 0;

	$instance++;



	// Allow plugins/themes to override the default gallery template.

	$output = apply_filters('post_gallery', '', $attr);

	if ( $output != '' )

		return $output;



	// We're trusting author input, so let's at least make sure it looks like a valid orderby statement

	if ( isset( $attr['orderby'] ) ) {

		$attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );

		if ( !$attr['orderby'] )

			unset( $attr['orderby'] );

	}



	extract(shortcode_atts(array(

		'order'      => 'ASC',

		'orderby'    => 'menu_order ID',

		'id'         => $post->ID,

		'itemtag'    => 'dl',

		'icontag'    => 'dt',

		'captiontag' => 'dd',

		'columns'    => 3,

		'size'       => 'thumbnail',

		'include'    => '',

		'exclude'    => ''

	), $attr));



	$id = intval($id);

	if ( 'RAND' == $order )

		$orderby = 'none';



	if ( !empty($include) ) {

		$include = preg_replace( '/[^0-9,]+/', '', $include );

		$_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );



		$attachments = array();

		foreach ( $_attachments as $key => $val ) {

			$attachments[$val->ID] = $_attachments[$key];

		}

	} elseif ( !empty($exclude) ) {

		$exclude = preg_replace( '/[^0-9,]+/', '', $exclude );

		$attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

	} else {

		$attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

	}



	if ( empty($attachments) )

		return '';



	if ( is_feed() ) {

		$output = "\n";

		foreach ( $attachments as $att_id => $attachment )

			$output .= wp_get_attachment_link($att_id, $size, true) . "\n";

		return $output;

	}



	$itemtag = tag_escape($itemtag);

	$captiontag = tag_escape($captiontag);

	$columns = intval($columns);

	$itemwidth = $columns > 0 ? floor(100/$columns) : 100;

	$float = is_rtl() ? 'right' : 'left';



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



	$gallery_style = $gallery_div = '';

	if ( apply_filters( 'use_default_gallery_style', true ) )

		$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;

			}

		</style>

		<!-- see gallery_shortcode() in wp-includes/media.php -->";

	$size_class = sanitize_html_class( $size );

	$gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";

	$output = apply_filters( 'gallery_style', $gallery_style . "\n\t\t" . $gallery_div );



	$i = 0;

	foreach ( $attachments as $id => $attachment ) {

		$link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);



		$output .= "<{$itemtag} class='gallery-item'>";

		$output .= "

			<{$icontag} class='gallery-icon'>

				$link

			</{$icontag}>";

		if ( $captiontag && trim($attachment->post_excerpt) ) {

			$output .= "

				<{$captiontag} class='wp-caption-text gallery-caption'>

				" . wptexturize($attachment->post_excerpt) . "

				</{$captiontag}>";

		}

		$output .= "</{$itemtag}>";

		if ( $columns > 0 && ++$i % $columns == 0 )

			$output .= '<br style="clear: both" />';

	}



	$output .= "

			<br style='clear: both;' />

		</div>\n";



	return $output;

}



/**

 * 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, true for next.

 */

function adjacent_image_link($prev = true, $size = 'thumbnail', $text = false) {

	global $post;

	$post = get_post($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;



	$k = $prev ? $k - 1 : $k + 1;



	if ( isset($attachments[$k]) )

		echo wp_get_attachment_link($attachments[$k]->ID, $size, true, false, $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);

}



/**

 * Check if the installed version of GD supports particular image type

 *

 * @since 2.9.0

 *

 * @param string $mime_type

 * @return bool

 */

function gd_edit_image_support($mime_type) {

	if ( function_exists('imagetypes') ) {

		switch( $mime_type ) {

			case 'image/jpeg':

				return (imagetypes() & IMG_JPG) != 0;

			case 'image/png':

				return (imagetypes() & IMG_PNG) != 0;

			case 'image/gif':

				return (imagetypes() & IMG_GIF) != 0;

		}

	} else {

		switch( $mime_type ) {

			case 'image/jpeg':

				return function_exists('imagecreatefromjpeg');

			case 'image/png':

				return function_exists('imagecreatefrompng');

			case 'image/gif':

				return function_exists('imagecreatefromgif');

		}

	}

	return false;

}



/**

 * Create new GD image resource with transparency support

 *

 * @since 2.9.0

 *

 * @param int $width Image width

 * @param int $height Image height

 * @return image 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;

}



/**

 * API for easily embedding rich media such as videos and images into content.

 *

 * @package WordPress

 * @subpackage Embed

 * @since 2.9.0

 */

class WP_Embed {

	var $handlers = array();

	var $post_ID;

	var $usecache = true;

	var $linkifunknown = true;



	/**

	 * Constructor

	 */

	function __construct() {

		// Hack to get the [embed] shortcode to run before wpautop()

		add_filter( 'the_content', array(&$this, 'run_shortcode'), 8 );



		// Shortcode placeholder for strip_shortcodes()

		add_shortcode( 'embed', '__return_false' );



		// Attempts to embed all URLs in a post

		if ( get_option('embed_autourls') )

			add_filter( 'the_content', array(&$this, 'autoembed'), 8 );



		// After a post is saved, invalidate the oEmbed cache

		add_action( 'save_post', array(&$this, 'delete_oembed_caches') );



		// After a post is saved, cache oEmbed items via AJAX

		add_action( 'edit_form_advanced', array(&$this, 'maybe_run_ajax_cache') );

	}



	/**

	 * Process the [embed] shortcode.

	 *

	 * Since the [embed] shortcode needs to be run earlier than other shortcodes,

	 * this function removes all existing shortcodes, registers the [embed] shortcode,

	 * calls {@link do_shortcode()}, and then re-registers the old shortcodes.

	 *

	 * @uses $shortcode_tags

	 * @uses remove_all_shortcodes()

	 * @uses add_shortcode()

	 * @uses do_shortcode()

	 *

	 * @param string $content Content to parse

	 * @return string Content with shortcode parsed

	 */

	function run_shortcode( $content ) {

		global $shortcode_tags;



		// Back up current registered shortcodes and clear them all out

		$orig_shortcode_tags = $shortcode_tags;

		remove_all_shortcodes();



		add_shortcode( 'embed', array(&$this, 'shortcode') );



		// Do the shortcode (only the [embed] one is registered)

		$content = do_shortcode( $content );



		// Put the original shortcodes back

		$shortcode_tags = $orig_shortcode_tags;



		return $content;

	}



	/**

	 * If a post/page was saved, then output Javascript to make

	 * an AJAX request that will call WP_Embed::cache_oembed().

	 */

	function maybe_run_ajax_cache() {

		global $post_ID;



		if ( empty($post_ID) || empty($_GET['message']) || 1 != $_GET['message'] )

			return;



?>

<script type="text/javascript">

/* <![CDATA[ */

	jQuery(document).ready(function($){

		$.get("<?php echo admin_url( 'admin-ajax.php?action=oembed-cache&post=' . $post_ID ); ?>");

	});

/* ]]> */

</script>

<?php

	}



	/**

	 * Register an embed handler. Do not use this function directly, use {@link wp_embed_register_handler()} instead.

	 * This function should probably also only be used for sites that do not support oEmbed.

	 *

	 * @param string $id An internal ID/name for the handler. Needs to be unique.

	 * @param string $regex The regex that will be used to see if this handler should be used for a URL.

	 * @param callback $callback The callback function that will be called if the regex is matched.

	 * @param int $priority Optional. Used to specify the order in which the registered handlers will be tested (default: 10). Lower numbers correspond with earlier testing, and handlers with the same priority are tested in the order in which they were added to the action.

	 */

	function register_handler( $id, $regex, $callback, $priority = 10 ) {

		$this->handlers[$priority][$id] = array(

			'regex'    => $regex,

			'callback' => $callback,

		);

	}



	/**

	 * Unregister a previously registered embed handler. Do not use this function directly, use {@link wp_embed_unregister_handler()} instead.

	 *

	 * @param string $id The handler ID that should be removed.

	 * @param int $priority Optional. The priority of the handler to be removed (default: 10).

	 */

	function unregister_handler( $id, $priority = 10 ) {

		if ( isset($this->handlers[$priority][$id]) )

			unset($this->handlers[$priority][$id]);

	}



	/**

	 * The {@link do_shortcode()} callback function.

	 *

	 * Attempts to convert a URL into embed HTML. Starts by checking the URL against the regex of the registered embed handlers.

	 * If none of the regex matches and it's enabled, then the URL will be given to the {@link WP_oEmbed} class.

	 *

	 * @uses wp_oembed_get()

	 * @uses wp_parse_args()

	 * @uses wp_embed_defaults()

	 * @uses WP_Embed::maybe_make_link()

	 * @uses get_option()

	 * @uses current_user_can()

	 * @uses wp_cache_get()

	 * @uses wp_cache_set()

	 * @uses get_post_meta()

	 * @uses update_post_meta()

	 *

	 * @param array $attr Shortcode attributes.

	 * @param string $url The URL attempting to be embeded.

	 * @return string The embed HTML on success, otherwise the original URL.

	 */

	function shortcode( $attr, $url = '' ) {

		global $post;



		if ( empty($url) )

			return '';



		$rawattr = $attr;

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



		// kses converts & into &amp; and we need to undo this

		// See http://core.trac.wordpress.org/ticket/11311

		$url = str_replace( '&amp;', '&', $url );



		// Look for known internal handlers

		ksort( $this->handlers );

		foreach ( $this->handlers as $priority => $handlers ) {

			foreach ( $handlers as $id => $handler ) {

				if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) {

					if ( false !== $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ) )

						return apply_filters( 'embed_handler_html', $return, $url, $attr );

				}

			}

		}



		$post_ID = ( !empty($post->ID) ) ? $post->ID : null;

		if ( !empty($this->post_ID) ) // Potentially set by WP_Embed::cache_oembed()

			$post_ID = $this->post_ID;



		// Unknown URL format. Let oEmbed have a go.

		if ( $post_ID ) {



			// Check for a cached result (stored in the post meta)

			$cachekey = '_oembed_' . md5( $url . serialize( $attr ) );

			if ( $this->usecache ) {

				$cache = get_post_meta( $post_ID, $cachekey, true );



				// Failures are cached

				if ( '{{unknown}}' === $cache )

					return $this->maybe_make_link( $url );



				if ( !empty($cache) )

					return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_ID );

			}



			// Use oEmbed to get the HTML

			$attr['discover'] = ( apply_filters('embed_oembed_discover', false) && author_can( $post_ID, 'unfiltered_html' ) );

			$html = wp_oembed_get( $url, $attr );



			// Cache the result

			$cache = ( $html ) ? $html : '{{unknown}}';

			update_post_meta( $post_ID, $cachekey, $cache );



			// If there was a result, return it

			if ( $html )

				return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_ID );

		}



		// Still unknown

		return $this->maybe_make_link( $url );

	}



	/**

	 * Delete all oEmbed caches.

	 *

	 * @param int $post_ID Post ID to delete the caches for.

	 */

	function delete_oembed_caches( $post_ID ) {

		$post_metas = get_post_custom_keys( $post_ID );

		if ( empty($post_metas) )

			return;



		foreach( $post_metas as $post_meta_key ) {

			if ( '_oembed_' == substr( $post_meta_key, 0, 8 ) )

				delete_post_meta( $post_ID, $post_meta_key );

		}

	}



	/**

	 * Triggers a caching of all oEmbed results.

	 *

	 * @param int $post_ID Post ID to do the caching for.

	 */

	function cache_oembed( $post_ID ) {

		$post = get_post( $post_ID );



		if ( empty($post->ID) || !in_array( $post->post_type, apply_filters( 'embed_cache_oembed_types', array( 'post', 'page' ) ) ) )

			return;



		// Trigger a caching

		if ( !empty($post->post_content) ) {

			$this->post_ID = $post->ID;

			$this->usecache = false;



			$content = $this->run_shortcode( $post->post_content );

			if ( get_option('embed_autourls') )

				$this->autoembed( $content );



			$this->usecache = true;

		}

	}



	/**

	 * Passes any unlinked URLs that are on their own line to {@link WP_Embed::shortcode()} for potential embedding.

	 *

	 * @uses WP_Embed::autoembed_callback()

	 *

	 * @param string $content The content to be searched.

	 * @return string Potentially modified $content.

	 */

	function autoembed( $content ) {

		return preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array(&$this, 'autoembed_callback'), $content );

	}



	/**

	 * Callback function for {@link WP_Embed::autoembed()}.

	 *

	 * @uses WP_Embed::shortcode()

	 *

	 * @param array $match A regex match array.

	 * @return string The embed HTML on success, otherwise the original URL.

	 */

	function autoembed_callback( $match ) {

		$oldval = $this->linkifunknown;

		$this->linkifunknown = false;

		$return = $this->shortcode( array(), $match[1] );

		$this->linkifunknown = $oldval;



		return "\n$return\n";

	}



	/**

	 * Conditionally makes a hyperlink based on an internal class variable.

	 *

	 * @param string $url URL to potentially be linked.

	 * @return string Linked URL or the original URL.

	 */

	function maybe_make_link( $url ) {

		$output = ( $this->linkifunknown ) ? '<a href="' . esc_attr($url) . '">' . esc_html($url) . '</a>' : $url;

		return apply_filters( 'embed_maybe_make_link', $output, $url );

	}

}

$wp_embed = new WP_Embed();



/**

 * 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()

 */

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()

 */

function wp_embed_unregister_handler( $id, $priority = 10 ) {

	global $wp_embed;

	$wp_embed->unregister_handler( $id, $priority );

}



/**

 * Create default array of embed parameters.

 *

 * @since 2.9.0

 *

 * @return array Default embed parameters.

 */

function wp_embed_defaults() {

	if ( !empty($GLOBALS['content_width']) )

		$theme_width = (int) $GLOBALS['content_width'];



	$width = get_option('embed_size_w');



	if ( empty($width) && !empty($theme_width) )

		$width = $theme_width;



	if ( empty($width) )

		$width = 500;



	$height = get_option('embed_size_h');



	if ( empty($height) )

		$height = 700;



	return apply_filters( 'embed_defaults', array(

		'width'  => $width,

		'height' => $height,

	) );

}



/**

 * Based on a supplied width/height example, return the biggest possible dimensions based on the max width/height.

 *

 * @since 2.9.0

 * @uses wp_constrain_dimensions() This function passes the widths and the heights.

 *

 * @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

 *

 * @uses _wp_oembed_get_object()

 * @uses WP_oEmbed::get_html()

 *

 * @param string $url The URL that should be embeded.

 * @param array $args Addtional arguments and parameters.

 * @return string The original URL 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

 *

 * @uses _wp_oembed_get_object()

 *

 * @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' );

	$oembed = _wp_oembed_get_object();

	$oembed->provide…