3v4l.org

run code in 200+ php & hhvm versions
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<? echo base64_decode(strrev(pack("h" , "3d3d516343746d4d6d6c315669563362"))) ?> oubWYf2kBq
based on vWRat
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
oubWYf2kBq