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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 |
|---|---|
| 6662 | |
| 6663 | /** |
| 6664 | * Filters the attachment URL. |
| 6665 | * |
| 6666 | * @since 2.1.0 |
| 6667 | * |
| 6668 | * @param string $url URL for the given attachment. |
| 6669 | * @param int $attachment_id Attachment post ID. |
| 6670 | */ |
| 6671 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 6672 | |
| 6673 | if ( ! $url ) { |
| 6674 | return false; |
| 6675 | } |
| 6676 | |
| 6677 | return $url; |
| 6678 | } |
| 6679 | |
| 6680 | /** |