wp-includes/rest-api/fields/class-wp-rest-meta-fields.php:232Deletes a meta value for an object.
$object_idint$meta_keystring$namestringtrue|WP_Error protected function delete_meta_value( $object_id, $meta_key, $name ) { $meta_type = $this->get_meta_type(); if ( ! current_user_can( "delete_{$meta_type}_meta", $object_id, $meta_key ) ) { return new WP_Error( 'rest_cannot_delete', /* 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(), ) ); } if ( null === get_metadata_raw( $meta_type, $object_id, wp_slash( $meta_key ) ) ) { return true; } if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ) ) ) { return new WP_Error( 'rest_meta_database_error', __( 'Could not delete meta value from database.' ), array( 'key' => $name, 'status' => WP_Http::INTERNAL_SERVER_ERROR, ) ); } return true; }Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api/fields/class-wp-rest-meta-fields.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.