Online PHP editor | refs for kOjTC

<?php function sum(float ...$numbers) : float { $_intsum = null; $intsum = function ($sum, array $numbers) use(&$_intsum) { $number = array_shift($numbers); $sum += $number; return $_intsum($sum, $numbers); }; $_intsum = $intsum; return $intsum(0, $numbers); } echo sum(1, 2, 3, 4); echo PHP_EOL; echo sum(1.5, 2, 3, 4); echo PHP_EOL; try { sum('a', 'b', 'c'); } catch (Error $e) { echo $e->getMessage(); }