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run code in 150+ php & hhvm versions
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<?php if(!isset($_GET["top"]) or $_GET["top"]<1 or $_GET["top"]>26):?> base_convert($_GET[top], 10, 36); <?php echo .chr(64 +( $_GET["top"])); ?>:
Output for 5.3.0 - 5.4.26
Parse error: syntax error, unexpected '.' in /in/BDD7N on line 5
Process exited with code 255.