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@ 2016-01-08T23:21:55Z

<?php

function cmp($b, $c){
    global $a;
    var_dump($a);
    $a->exchangeArray(array());
}

$a = new ArrayObject();
$a[1] = 1;
$a[2] = 2;
$a[3] = 3;

$a->uasort(cmp);

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

50.58 ms | 402 KiB | 5 Q