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metadata_exists( string $meta_type, int $object_id, string $meta_key )

Determine if a meta key is set for a given object

Description

Parameters

$meta_type

(string) (Required) Type of object metadata is for (e.g., comment, post, term, or user).

$object_id

(int) (Required) ID of the object metadata is for

$meta_key

(string) (Required) Metadata key.

Return

(bool) True of the key is set, false if not.

Source

File: wp-includes/meta.php

function metadata_exists( $meta_type, $object_id, $meta_key ) {
	if ( ! $meta_type || ! is_numeric( $object_id ) ) {
		return false;
	}

	$object_id = absint( $object_id );
	if ( ! $object_id ) {
		return false;
	}

	/** This filter is documented in wp-includes/meta.php */
	$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true );
	if ( null !== $check ) {
		return (bool) $check;
	}

	$meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' );

	if ( ! $meta_cache ) {
		$meta_cache = update_meta_cache( $meta_type, array( $object_id ) );
		$meta_cache = $meta_cache[ $object_id ];
	}

	if ( isset( $meta_cache[ $meta_key ] ) ) {
		return true;
	}

	return false;
}

Changelog

Version Description
3.3.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/metadata_exists