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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 |
|---|---|
| 5002 | |
| 5003 | /** |
| 5004 | * Filter the attachment URL. |
| 5005 | * |
| 5006 | * @since 2.1.0 |
| 5007 | * |
| 5008 | * @param string $url URL for the given attachment. |
| 5009 | * @param int $post_id Attachment ID. |
| 5010 | */ |
| 5011 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 5012 | |
| 5013 | if ( empty( $url ) ) |
| 5014 | return false; |
| 5015 | |
| 5016 | return $url; |
| 5017 | } |
| 5018 | |
| 5019 | /** |
| 5020 | * Retrieve thumbnail for an attachment. |