3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 0; $a = substr('', 0, 10); var_dump($a); var_dump(gettype('0'));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(0) "" string(6) "string"
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
bool(false) string(6) "string"
preferences:
213.98 ms | 402 KiB | 229 Q