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run code in 150+ php & hhvm versions
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<?php echo bin2hex(strrev(base64_encode("3d3d516343746d4d6d6c315669563362"))); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
3d496a4e7a4d6a4e316b6a4e3255544d7a4d6d4e6b5a445a30516d4e30637a4d304d6a4e7855445a7a51324d