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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 |
|---|---|
| 804 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 805 | * object type (comment, post, term, or user). Returning a non-null value |
| 806 | * will effectively short-circuit the function. |
| 807 | * |
| 808 | * @since 5.0.0 |
| 809 | * |
| 810 | * @param null|bool $delete Whether to allow metadata deletion of the given type. |
| 811 | * @param int $meta_id Meta ID. |
| 812 | */ |
| 813 | $check = apply_filters( "delete_{$meta_type}_metadata_by_mid", null, $meta_id ); |
| 814 | if ( null !== $check ) { |
| 815 | return (bool) $check; |
| 816 | } |
| 817 | |
| 818 | // Fetch the meta and go on if it's found. |
| 819 | $meta = get_metadata_by_mid( $meta_type, $meta_id ); |
| 820 | if ( $meta ) { |
| 821 | $object_id = (int) $meta->{$column}; |
| 822 | |