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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 |
|---|---|
| 954 | $image = image_downsize( $attachment_id, $size ); |
| 955 | if ( ! $image ) { |
| 956 | $src = false; |
| 957 | |
| 958 | if ( $icon ) { |
| 959 | $src = wp_mime_type_icon( $attachment_id ); |
| 960 | |
| 961 | if ( $src ) { |
| 962 | /** This filter is documented in wp-includes/post.php */ |
| 963 | $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' ); |
| 964 | |
| 965 | $src_file = $icon_dir . '/' . wp_basename( $src ); |
| 966 | list( $width, $height ) = wp_getimagesize( $src_file ); |
| 967 | } |
| 968 | } |
| 969 | |
| 970 | if ( $src && $width && $height ) { |
| 971 | $image = array( $src, $width, $height, false ); |
| 972 | } |