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run code in 300+ PHP versions simultaneously
<?php $limiter = 50; $func = function() use (&$limiter, &$func) { $limiter--; if (!$limiter) { print "<pre>"; debug_print_backtrace(); throw new Exception("test error"); } if ($limiter <= 0) return; $func(); }; $func();

preferences:
75.85 ms | 402 KiB | 5 Q