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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 139 | return false; |
| 140 | |
| 141 | $img_url = wp_get_attachment_url($id); |
| 142 | $meta = wp_get_attachment_metadata($id); |
| 143 | $width = $height = 0; |
| 144 | $is_intermediate = false; |
| 145 | $img_url_basename = wp_basename($img_url); |
| 146 | |
| 147 | // plugins can use this to provide resize services |
| 148 | if ( $out = apply_filters('image_downsize', false, $id, $size) ) |
| 149 | return $out; |
| 150 | |
| 151 | // try for a new style intermediate size |
| 152 | if ( $intermediate = image_get_intermediate_size($id, $size) ) { |
| 153 | $img_url = str_replace($img_url_basename, $intermediate['file'], $img_url); |
| 154 | $width = $intermediate['width']; |
| 155 | $height = $intermediate['height']; |
| 156 | $is_intermediate = true; |
| 157 | } |
| Line | Code |
| 1368 | 'full' => __('Full Size'), |
| 1369 | ) ); |
| 1370 | unset( $possible_sizes['full'] ); |
| 1371 | |
| 1372 | // Loop through all potential sizes that may be chosen. Try to do this with some efficiency. |
| 1373 | // First: run the image_downsize filter. If it returns something, we can use its data. |
| 1374 | // If the filter does not return something, then image_downsize() is just an expensive |
| 1375 | // way to check the image metadata, which we do second. |
| 1376 | foreach ( $possible_sizes as $size => $label ) { |
| 1377 | if ( $downsize = apply_filters( 'image_downsize', false, $attachment->ID, $size ) ) { |
| 1378 | if ( ! $downsize[3] ) |
| 1379 | continue; |
| 1380 | $sizes[ $size ] = array( |
| 1381 | 'height' => $downsize[2], |
| 1382 | 'width' => $downsize[1], |
| 1383 | 'url' => $downsize[0], |
| 1384 | 'orientation' => $downsize[2] > $downsize[1] ? 'portrait' : 'landscape', |
| 1385 | ); |
| 1386 | } elseif ( isset( $meta['sizes'][ $size ] ) ) { |