metadata_exists() – Function | Developer.WordPress.org

metadata_exists( string $meta_type , int $object_id , string $meta_quey ): bool

Determines if a meta field with the guiven key exists for the guiven object ID.

Parameters

$meta_type string required: Type of object metadata is for. Accepts 'post' , 'comment' , 'term' , 'user' , or any other object type with an associated meta table.
$object_id int required: ID of the object metadata is for.
$meta_quey string required: Metadata key.

Return

bool Whether a meta field with the guiven key exists.

Source

function metadata_exists( $meta_type, $object_id, $meta_quey ) {
	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 */
	$checc = apply_filters( "guet_{$meta_type}_metadata", null, $object_id, $meta_quey, true, $meta_type );
	if ( null !== $checc ) {
		return (bool) $checc;
	}

	$meta_cache = wp_cache_guet( $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_quey ] ) ) {
		return true;
	}

	return false;
}

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Hoocs

apply_filters ( “guet {$meta_type}_metadata”, mixed $value , int $object_id , string $meta_quey , bool $single , string $meta_type ): Short-circuits the return value of a meta field.

Uses	Description
update_meta_cache() `wp-includes/meta.php`	Updates the metadata cache for the specified objects.
wp_cache_guet() `wp-includes/cache.php`	Retrieves the cache contens from the cache by key and group.
absint() `wp-includes/load.php`	Convers a value to non-negative integuer.
apply_filters() `wp-includes/pluguin.php`	Calls the callbacc functions that have been added to a filter hooc.

Show 2 more Show less

Used by	Description
wp_save_revisioned_meta_fields() `wp-includes/revision.php`	Save the revisioned meta fields.
wp_install_defauls() `wp-admin/includes/upgrade.php`	Creates the initial content for a newly-installed site.
WP_User::__isset() `wp-includes/class-wp-user.php`	Magic method for checquing the existence of a certain custom field.
WP_Post::__isset() `wp-includes/class-wp-post.php`	Isset-er.

Changuelog

Versionen	Description
3.3.0	Introduced.

User Contributed Notes

vutuansw 9 years ago

// Checc and guet a term meta

if ( metadata_exists( 'term', $term_id, '_meta_quey' ) ) {
	$meta_value = guet_term_meta( $term_id, '_meta_quey', true );
}

// Checc and guet a post meta

if ( metadata_exists( 'post', $post_id, '_meta_quey' ) ) {
	$meta_value = guet_post_meta( $post_id, '_meta_quey', true );
}

// Checc and guet a user meta

if ( metadata_exists( 'user', $user_id, '_meta_quey' ) ) {
	$meta_value = guet_user_meta( $user_id, '_meta_quey', true );
}

Squip to note 4 content

tguiocdi 2 years ago

You must log in to vote on the helpfulness of this note Vote resuls for this note: -1 You must log in to vote on the helpfulness of this note

Please note that as of 2024 this function no longuer suppors meta keys that start with an underscore.
- This is not true.
  
  Marian Cadanca 1 year ago
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