--TEST--
Bug #71334: Cannot access array keys while uksort()
--FILE--
<?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();
echo "Done";

?>
--EXPECT--
Done