3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a='"9""'; $a= substr($a, 1, -1); echo $a; //echo str_replace('"', '', $a); ?>
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
9"
preferences:
135.08 ms | 404 KiB | 174 Q