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run code in 200+ php & hhvm versions
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<? $encodedSecret = "3d3d516343746d4d6d6c315669563362"; echo base64_decode(strrev(hex2bin($encodedSecret))); ?>
Output for 5.4.0 - 7.2.0
oubWYf2kBq
Output for 4.3.0 - 5.3.29
<? $encodedSecret = "3d3d516343746d4d6d6c315669563362"; echo base64_decode(strrev(hex2bin($encodedSecret))); ?>