registered_meta_key_exists( string $object_type, string $meta_key, string $object_subtype = '' ): bool

Checks if a meta key is registered.

Parameters

$object_typestringrequired: Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.
$meta_keystringrequired: Metadata key.
$object_subtypestringoptional: The subtype of the object type.
Default:''

Return

bool True if the meta key is registered to the object type and, if provided, the object subtype. False if not.

Source

function registered_meta_key_exists( $object_type, $meta_key, $object_subtype = '' ) {
	$meta_keys = get_registered_meta_keys( $object_type, $object_subtype );

	return isset( $meta_keys[ $meta_key ] );
}

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Uses	Description
get_registered_meta_keys()`wp-includes/meta.php`	Retrieves a list of registered metadata args for an object type, keyed by their meta keys.

Used by	Description
unregister_meta_key()`wp-includes/meta.php`	Unregisters a meta key from the list of registered keys.
get_registered_metadata()`wp-includes/meta.php`	Retrieves registered metadata for a specified object.

Changelog

Version	Description
4.9.8	The `$object_subtype` parameter was added.
4.6.0	Introduced.

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