Online PHP editor | refs for eEMnQ

<?php class myClass { private $a = [ 'foo-test' => [1], '-' => [2], 'bar-test' => [3] ]; private function _mySort($x, $y) { if (!isset($this->a[$x])) { throw new Exception('Missing X: "' . $x . '"'); } if (!isset($this->a[$y])) { throw new Exception('Missing Y: "' . $y . '"'); } return $x < $y; } public function __construct() { uksort($this->a, [$this, '_mySort']); } } // new myClass(); $a = ['foo-test' => [1], '-' => [2], 'bar-test' => [3]]; uksort($a, function($x, $y) { if (!isset($a[$x])) { throw new Exception('Missing X: "' . $x . '"'); } if (!isset($a[$y])) { throw new Exception('Missing Y: "' . $y . '"'); } return $x < $y; });