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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 |
|---|---|
| 5356 | |
| 5357 | /** |
| 5358 | * Filters the attachment URL. |
| 5359 | * |
| 5360 | * @since 2.1.0 |
| 5361 | * |
| 5362 | * @param string $url URL for the given attachment. |
| 5363 | * @param int $attachment_id Attachment post ID. |
| 5364 | */ |
| 5365 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 5366 | |
| 5367 | if ( empty( $url ) ) |
| 5368 | return false; |
| 5369 | |
| 5370 | return $url; |
| 5371 | } |
| 5372 | |
| 5373 | /** |
| 5374 | * Retrieves the caption for an attachment. |