wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php:177Checks for a valid value for the reassign parameter when deleting users.
$valueint|bool$requestWP_REST_Request$paramstringint|bool|WP_Error public function check_reassign( $value, $request, $param ) { if ( is_numeric( $value ) ) { return $value; } if ( empty( $value ) || false === $value || 'false' === $value ) { return false; } return new WP_Error( 'rest_invalid_param', __( 'Invalid user parameter(s).' ), array( 'status' => 400 ) ); }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/endpoints/class-wp-rest-users-controller.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.