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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 |
|---|---|
| 5817 | |
| 5818 | /** |
| 5819 | * Filters the updated attachment meta data. |
| 5820 | * |
| 5821 | * @since 2.1.0 |
| 5822 | * |
| 5823 | * @param array $data Array of updated attachment meta data. |
| 5824 | * @param int $attachment_id Attachment post ID. |
| 5825 | */ |
| 5826 | $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ); |
| 5827 | if ( $data ) { |
| 5828 | return update_post_meta( $post->ID, '_wp_attachment_metadata', $data ); |
| 5829 | } else { |
| 5830 | return delete_post_meta( $post->ID, '_wp_attachment_metadata' ); |
| 5831 | } |
| 5832 | } |
| 5833 | |
| 5834 | /** |
| 5835 | * Retrieve the URL for an attachment. |