3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str='nigg[fag]=lol&nigg[faggot]=lal'; parse_str($str,$res); var_dump($res);
Output for 7.0.0 - 7.0.31, 7.1.0 - 7.1.21, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { ["nigg"]=> array(2) { ["fag"]=> string(3) "lol" ["faggot"]=> string(3) "lal" } }

preferences:
171.07 ms | 403 KiB | 200 Q