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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 |
|---|---|
| 2456 | $sized = image_downsize( $post_id, 'thumbnail' ); |
| 2457 | if ( $sized ) |
| 2458 | return $sized[0]; |
| 2459 | |
| 2460 | if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) ) |
| 2461 | return false; |
| 2462 | |
| 2463 | $url = str_replace(basename($url), basename($thumb), $url); |
| 2464 | |
| 2465 | return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID ); |
| 2466 | } |
| 2467 | |
| 2468 | /** |
| 2469 | * wp_attachment_is_image() - Check if the attachment is an image |
| 2470 | * |
| 2471 | * {@internal Missing Long Description}} |
| 2472 | * |
| 2473 | * @package WordPress |
| 2474 | * @subpackage Post |