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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 |
|---|---|
| 5888 | |
| 5889 | /** |
| 5890 | * Filters the attachment URL. |
| 5891 | * |
| 5892 | * @since 2.1.0 |
| 5893 | * |
| 5894 | * @param string $url URL for the given attachment. |
| 5895 | * @param int $attachment_id Attachment post ID. |
| 5896 | */ |
| 5897 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 5898 | |
| 5899 | if ( empty( $url ) ) { |
| 5900 | return false; |
| 5901 | } |
| 5902 | |
| 5903 | return $url; |
| 5904 | } |
| 5905 | |
| 5906 | /** |