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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 |
|---|---|
| 2538 | } |
| 2539 | } |
| 2540 | |
| 2541 | if ( empty($url) ) //If any of the above options failed, Fallback on the GUID as used pre-2.7, not recomended to rely upon this. |
| 2542 | $url = get_the_guid( $post->ID ); |
| 2543 | |
| 2544 | if ( 'attachment' != $post->post_type || empty($url) ) |
| 2545 | return false; |
| 2546 | |
| 2547 | return apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 2548 | } |
| 2549 | |
| 2550 | /** |
| 2551 | * Retrieve thumbnail for an attachment. |
| 2552 | * |
| 2553 | * @since 2.1.0 |
| 2554 | * |
| 2555 | * @param int $post_id Attachment ID. |
| 2556 | * @return mixed False on failure. Thumbnail file path on success. |