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 string $size Optional, default is 'medium'. Size of image, can be 'thumbnail'. * @return bool|array False on failure, array on success. */ function image_downsize($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; // 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) ) { $img_url = str_replace(basename($img_url), $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) ) { $img_url = str_replace(basename($img_url), 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( $height ), 'crop' => !!$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 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); $html = '' . esc_attr($alt) . ''; $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 “%s” doesn’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', '256M'); $image = imagecreatefromstring( file_get_contents( $file ) ); if ( !is_resource( $image ) ) return sprintf(__('File “%s” 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; if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width ) $width_ratio = $max_width / $current_width; if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height ) $height_ratio = $max_height / $current_height; // the smaller ratio is the one we need to fit it to the constraining box $ratio = min( $width_ratio, $height_ratio ); return array( intval($current_width * $ratio), intval($current_height * $ratio) ); } /** * 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']; $name = basename($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' => 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. * * @since 2.5.0 * * @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 exactly, 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[5] != $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 = $icon_dir . '/' . basename($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 * * @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(" $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 '
' . do_shortcode( $content ) . '

' . $caption . '

'; } 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}"; $output = apply_filters('gallery_style', " \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 $mime_type string * @return bool */ function gd_edit_image_support($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 $width * @param $height * @return image resource */ function wp_imagecreatetruecolor($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; /** * PHP4 constructor */ function WP_Embed() { return $this->__construct(); } /** * PHP5 constructor */ function __construct() { // Hack to get the [embed] shortcode to run before wpautop() add_filter( 'the_content', array(&$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; // Backup 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 != $_GET['message'] ) return; ?> handlers[$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() ); // 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 ); } // 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 ); } // 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 = ( $this->linkifunknown ) ? '' . esc_html($url) . '' : $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(); $oembed->providers[$format] = array( $provider, $regex ); }