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@ 2016-05-21T10:16:05Z

<?php
$str = "abcdefgh";
$ass_arr = array();
$ass_arr["foo"] = "bar";

$str = preg_replace_callback("/[aeiou]/", function($matches){
    global $ass_arr;
      $ass_arr["bar"] = "baz";
      return "x";
    }, $str);

var_dump($str);
var_dump($ass_arr);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace_callback: documentation ( source)

preferences:dark modelive preview

52.29 ms | 402 KiB | 5 Q