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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 |
|---|---|
| 1515 | return false; |
| 1516 | if ( !$url = wp_get_attachment_url( $post->ID ) ) |
| 1517 | return false; |
| 1518 | |
| 1519 | if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) ) |
| 1520 | return false; |
| 1521 | |
| 1522 | $url = str_replace(basename($url), basename($thumb), $url); |
| 1523 | |
| 1524 | return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID ); |
| 1525 | } |
| 1526 | |
| 1527 | function wp_attachment_is_image( $post_id = 0 ) { |
| 1528 | $post_id = (int) $post_id; |
| 1529 | if ( !$post =& get_post( $post_id ) ) |
| 1530 | return false; |
| 1531 | |
| 1532 | if ( !$file = get_attached_file( $post->ID ) ) |
| 1533 | return false; |