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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 |
|---|---|
| 6432 | |
| 6433 | /** |
| 6434 | * Filters the attachment URL. |
| 6435 | * |
| 6436 | * @since 2.1.0 |
| 6437 | * |
| 6438 | * @param string $url URL for the given attachment. |
| 6439 | * @param int $attachment_id Attachment post ID. |
| 6440 | */ |
| 6441 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 6442 | |
| 6443 | if ( ! $url ) { |
| 6444 | return false; |
| 6445 | } |
| 6446 | |
| 6447 | return $url; |
| 6448 | } |
| 6449 | |
| 6450 | /** |