WP_REST_Meta_Fields::update_multi_meta_value( int $object_id, string $meta_key, string $name, array $values ): true|WP_Error

Source

protected function update_multi_meta_value( $object_id, $meta_key, $name, $values ) {
	$meta_type = $this->get_meta_type();

	if ( ! current_user_can( "edit_{$meta_type}_meta", $object_id, $meta_key ) ) {
		return new WP_Error(
			'rest_cannot_update',
			/* translators: %s: Custom field key. */
			sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),
			array(
				'key'    => $name,
				'status' => rest_authorization_required_code(),
			)
		);
	}

	$current_values = get_metadata( $meta_type, $object_id, $meta_key, false );
	$subtype        = get_object_subtype( $meta_type, $object_id );

	if ( ! is_array( $current_values ) ) {
		$current_values = array();
	}

	$to_remove = $current_values;
	$to_add    = $values;

	foreach ( $to_add as $add_key => $value ) {
		$remove_keys = array_keys(
			array_filter(
				$current_values,
				function ( $stored_value ) use ( $meta_key, $subtype, $value ) {
					return $this->is_meta_value_same_as_stored_value( $meta_key, $subtype, $stored_value, $value );
				}
			)
		);

		if ( empty( $remove_keys ) ) {
			continue;
		}

		if ( count( $remove_keys ) > 1 ) {
			// To remove, we need to remove first, then add, so don't touch.
			continue;
		}

		$remove_key = $remove_keys[0];

		unset( $to_remove[ $remove_key ] );
		unset( $to_add[ $add_key ] );
	}

	/*
	 * `delete_metadata` removes _all_ instances of the value, so only call once. Otherwise,
	 * `delete_metadata` will return false for subsequent calls of the same value.
	 * Use serialization to produce a predictable string that can be used by array_unique.
	 */
	$to_remove = array_map( 'maybe_unserialize', array_unique( array_map( 'maybe_serialize', $to_remove ) ) );

	foreach ( $to_remove as $value ) {
		if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {
			return new WP_Error(
				'rest_meta_database_error',
				/* translators: %s: Custom field key. */
				sprintf( __( 'Could not update the meta value of %s in database.' ), $meta_key ),
				array(
					'key'    => $name,
					'status' => WP_Http::INTERNAL_SERVER_ERROR,
				)
			);
		}
	}

	foreach ( $to_add as $value ) {
		if ( ! add_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {
			return new WP_Error(
				'rest_meta_database_error',
				/* translators: %s: Custom field key. */
				sprintf( __( 'Could not update the meta value of %s in database.' ), $meta_key ),
				array(
					'key'    => $name,
					'status' => WP_Http::INTERNAL_SERVER_ERROR,
				)
			);
		}
	}

	return true;
}

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