3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s = "q w e r t y"; $t = $s; do $t = str_replace(' ', ' ', $t, $count); while($count); echo $t;
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
q w e r t y

preferences:
28.27 ms | 409 KiB | 5 Q