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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 |
---|---|
814 | * Returning a non-null value will effectively short-circuit the function. |
815 | * |
816 | * @since 5.0.0 |
817 | * |
818 | * @param null|bool $check Whether to allow updating metadata for the given type. |
819 | * @param int $meta_id Meta ID. |
820 | * @param mixed $meta_value Meta value. Must be serializable if non-scalar. |
821 | * @param string|false $meta_key Meta key, if provided. |
822 | */ |
823 | $check = apply_filters( "update_{$meta_type}_metadata_by_mid", null, $meta_id, $meta_value, $meta_key ); |
824 | if ( null !== $check ) { |
825 | return (bool) $check; |
826 | } |
827 |
|
828 | // Fetch the meta and go on if it's found. |
829 | $meta = get_metadata_by_mid( $meta_type, $meta_id ); |
830 | if ( $meta ) { |
831 | $original_key = $meta->meta_key; |
832 | $object_id = $meta->{$column}; |