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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 |
|---|---|
| 4807 | |
| 4808 | /** |
| 4809 | * Filter the attachment URL. |
| 4810 | * |
| 4811 | * @since 2.1.0 |
| 4812 | * |
| 4813 | * @param string $url URL for the given attachment. |
| 4814 | * @param int $post_id Attachment ID. |
| 4815 | */ |
| 4816 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 4817 | |
| 4818 | if ( empty( $url ) ) |
| 4819 | return false; |
| 4820 | |
| 4821 | return $url; |
| 4822 | } |
| 4823 | |
| 4824 | /** |
| 4825 | * Retrieve thumbnail for an attachment. |