3v4l.org

run code in 300+ PHP versions simultaneously
<?php $n = 1; while ($n < 6){ $sub = 'sub'.(string)$n; echo $sub; }
Output for git.master, git.master_jit, rfc.property-hooks
sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1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Process exited with code 137.

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35.06 ms | 437 KiB | 8 Q