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run code in 300+ PHP versions simultaneously
<?php $a = "b"; echo ++$a  . "\n"; $a = "abc"; echo ++$a  . "\n"; $a = "a4"; echo ++$a . "\n"; $a = "a4b1"; echo ++$a  . "\n";
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $a  in /in/ug20T on line 4 1 2 a5 3

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