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run code in 300+ PHP versions simultaneously
<?php $auth = false; $s = serialize($auth); echo $s; echo "\n"; echo strrev($s); setcookie("auth", $s); echo $_COOKIE["auth"]; echo "\n"; echo $auth; ?>
Output for git.master, git.master_jit, rfc.property-hooks
b:0; ;0:b Warning: Cannot modify header information - headers already sent by (output started at /in/6ItmL:5) in /in/6ItmL on line 10 Warning: Undefined array key "auth" in /in/6ItmL on line 11

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