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run code in 150+ php & hhvm versions
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<? echo base64_decode(strrev(pack("H*" , "3d3d516343746d4d6d6c315669563362"))) ?> oubWYf2kBq
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
oubWYf2kBq oubWYf2kBq
Output for 4.3.0 - 5.3.29
<? echo base64_decode(strrev(pack("H*" , "3d3d516343746d4d6d6c315669563362"))) ?> oubWYf2kBq