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@ 2013-10-04T09:56:48Z

<?php

$array1 = array(0, 1);
$array2 = array(&$array1);

ob_start(function($str) use(&$array1) {
    static $i = 0;
    if ($i++ == 4) {
        unset($array1[0]);
        //unset($array1[1]);
    }
    return "$i: $str";
}, 1);

var_dump($array2);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
ob_start: documentation ( source)

preferences:dark modelive preview

56.45 ms | 402 KiB | 5 Q