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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 |
|---|---|
| 3850 | $post_id = (int) $post_id; |
| 3851 | if ( !$post =& get_post( $post_id ) ) |
| 3852 | return false; |
| 3853 | if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) ) |
| 3854 | return false; |
| 3855 | |
| 3856 | $file = get_attached_file( $post->ID ); |
| 3857 | |
| 3858 | if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) |
| 3859 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 3860 | return false; |
| 3861 | } |
| 3862 | |
| 3863 | /** |
| 3864 | * Retrieve URL for an attachment thumbnail. |
| 3865 | * |
| 3866 | * @since 2.1.0 |
| 3867 | * |
| 3868 | * @param int $post_id Attachment ID |