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run code in 200+ php & hhvm versions
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<?php function numhash($n) { return (((0x0000FFFF & $n) << 16) + ((0xFFFF0000 & $n) >> 16)); } echo numhash(5); ?>
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0beta1
327680