3v4l.org

run code in 300+ PHP versions simultaneously
<?php $i = 0; $k = 1; $count = 1; while($count++ < 7) { echo debug_print_backtrace()."no backtrace at all\n"; $boof = $k; $k = $i + $k; $i = $boof; }
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
no backtrace at all no backtrace at all no backtrace at all no backtrace at all no backtrace at all no backtrace at all
preferences:
71.08 ms | 406 KiB | 5 Q