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To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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 |
|---|---|
| 1452 | $post_id = (int) $post_id; |
| 1453 | if ( !$post =& get_post( $post_id ) ) |
| 1454 | return false; |
| 1455 | if ( !$imagedata = wp_get_attachment_metadata( $post->ID ) ) |
| 1456 | return false; |
| 1457 | |
| 1458 | $file = get_attached_file( $post->ID ); |
| 1459 | |
| 1460 | if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) |
| 1461 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 1462 | return false; |
| 1463 | } |
| 1464 | |
| 1465 | function wp_get_attachment_thumb_url( $post_id = 0 ) { |
| 1466 | $post_id = (int) $post_id; |
| 1467 | if ( !$post =& get_post( $post_id ) ) |
| 1468 | return false; |
| 1469 | if ( !$url = wp_get_attachment_url( $post->ID ) ) |
| 1470 | return false; |