--TEST-- Scalar type missing parameters --FILE-- function (int $i) { return $i; }, 'float' => function (float $f) { return $f; }, 'string' => function (string $s) { return $s; }, 'bool' => function (bool $b) { return $b; }, 'int nullable' => function (int $i = NULL) { return $i; }, 'float nullable' => function (float $f = NULL) { return $f; }, 'string nullable' => function (string $s = NULL) { return $s; }, 'bool nullable' => function (bool $b = NULL) { return $b; } ]; foreach ($functions as $type => $function) { echo "Testing $type:", PHP_EOL; try { var_dump($function()); } catch (Throwable $e) { echo "*** Caught " . $e->getMessage() . PHP_EOL; } } echo PHP_EOL . "Done"; ?> --EXPECTF-- Testing int: *** Caught Too few arguments to function {closure}(), 0 passed in %s on line %d and exactly 1 expected Testing float: *** Caught Too few arguments to function {closure}(), 0 passed in %s on line %d and exactly 1 expected Testing string: *** Caught Too few arguments to function {closure}(), 0 passed in %s on line %d and exactly 1 expected Testing bool: *** Caught Too few arguments to function {closure}(), 0 passed in %s on line %d and exactly 1 expected Testing int nullable: NULL Testing float nullable: NULL Testing string nullable: NULL Testing bool nullable: NULL Done