3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = 'yo'; var_dump(substr( $x, 3 ));
Output for 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(0) ""
Output for 7.1.25 - 7.1.28, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
bool(false)
preferences:
129.85 ms | 402 KiB | 164 Q