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run code in 150+ php & hhvm versions
Bugs & Features
<?php if(!isset($_GET["top"]) or $_GET["top"]<1 or $_GET["top"]>26):?> base_convert($number, 10, 36); <?php echo .chr(64 +( $_GET["top"])); ?>:
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.4.26
Parse error: syntax error, unexpected '.' in /in/i6bTo on line 4
Process exited with code 255.