3v4l.org

run code in 300+ PHP versions simultaneously
<?php global $i; $x=$y=''; set_error_handler(function() { echo 'Depth:' . $i . PHP_EOL; die; }); for($i=0;true;++$i) { $x .= '['; $y .= ']'; eval('$a = ' . $x . $y . ';'); }
Output for 5.6.38, 7.1.22, 7.2.10 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4

Process exited with code 137.

preferences:
104.86 ms | 403 KiB | 138 Q