3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "0a0"; $prev = $a; for ($i=0; $i<100000; $i++) { $a++; if (!is_string($a)) { var_dump($prev); var_dump($a); var_dump($i); break; } $prev = $a; } ?>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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(3) "0e0" float(1) int(40)
preferences:
295.33 ms | 406 KiB | 401 Q