Online PHP editor | refs for kZ28v

@ 2016-01-11T23:30:39Z

<?php

$a = ['foo-test' => [1], '-' => [2], 'bar-test' => [3]];
uksort($a, function($x, $y) use (&$a) {
    // global $a;

    if (!isset($a[$x])) {
		throw new Exception("$x");
	}

	if (!isset($a[$y])) {
		throw new Exception("$y");
	}

	return $x < $y;
});