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run code in 200+ php & hhvm versions
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<?php <?php $encodedSecret = "3d3d516343746d4d6d6c315669563362"; echo base64_decode(strrev(hex2bin($encodedSecret))); ?> ?>
Output for 5.3.0 - 5.4.20
Parse error: syntax error, unexpected '<' in /in/STR7q on line 3
Process exited with code 255.