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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 |
|---|---|
| 6635 | |
| 6636 | /** |
| 6637 | * Filters the attachment URL. |
| 6638 | * |
| 6639 | * @since 2.1.0 |
| 6640 | * |
| 6641 | * @param string $url URL for the given attachment. |
| 6642 | * @param int $attachment_id Attachment post ID. |
| 6643 | */ |
| 6644 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 6645 | |
| 6646 | if ( ! $url ) { |
| 6647 | return false; |
| 6648 | } |
| 6649 | |
| 6650 | return $url; |
| 6651 | } |
| 6652 | |
| 6653 | /** |