3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $n = 1; while ($n < 6){ $sub = 'sub'.(string)$n; echo $sub; }
Output for 4.3.0 - 7.2.0
sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1sub1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Process exited with code 137.