3v4l.org

run code in 300+ PHP versions simultaneously
<?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 for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(8) "xbcdxfgh" array(2) { ["foo"]=> string(3) "bar" ["bar"]=> string(3) "baz" }
preferences:
230.74 ms | 404 KiB | 243 Q