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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.
| Line | Code |
|---|---|
| 128 | if ( !wp_attachment_is_image($id) ) |
| 129 | return false; |
| 130 | |
| 131 | $img_url = wp_get_attachment_url($id); |
| 132 | $meta = wp_get_attachment_metadata($id); |
| 133 | $width = $height = 0; |
| 134 | $is_intermediate = false; |
| 135 | |
| 136 | // plugins can use this to provide resize services |
| 137 | if ( $out = apply_filters('image_downsize', false, $id, $size) ) |
| 138 | return $out; |
| 139 | |
| 140 | // try for a new style intermediate size |
| 141 | if ( $intermediate = image_get_intermediate_size($id, $size) ) { |
| 142 | $img_url = str_replace(basename($img_url), $intermediate['file'], $img_url); |
| 143 | $width = $intermediate['width']; |
| 144 | $height = $intermediate['height']; |
| 145 | $is_intermediate = true; |
| 146 | } |