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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 |
|---|---|
| 767 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 768 | * object type (comment, post, term, or user). Returning a non-null value |
| 769 | * will effectively short-circuit the function. |
| 770 | * |
| 771 | * @since 5.0.0 |
| 772 | * |
| 773 | * @param null|bool $delete Whether to allow metadata deletion of the given type. |
| 774 | * @param int $meta_id Meta ID. |
| 775 | */ |
| 776 | $check = apply_filters( "delete_{$meta_type}_metadata_by_mid", null, $meta_id ); |
| 777 | if ( null !== $check ) { |
| 778 | return (bool) $check; |
| 779 | } |
| 780 | |
| 781 | // Fetch the meta and go on if it's found. |
| 782 | if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { |
| 783 | $object_id = $meta->{$column}; |
| 784 | |
| 785 | /** This action is documented in wp-includes/meta.php */ |