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run code in 150+ php & hhvm versions
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<?php $msb = -1 * pow(2,62); for ($i=62; $i >= 0; $i--) { $result = pow(2,$i); $msb += $result; } echo '***',$msb,'****';
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
***4611686018427387903****