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run code in 150+ php & hhvm versions
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<?php $msb = -1 * pow(2,63); for ($i=62; $i >= 0; $i--) { $result = pow(2,$i); $msb += $result; } echo $msb;
Output for 4.3.0 - 4.3.1, 4.3.5 - 7.1.0
-1
Output for 4.3.2 - 4.3.4
1.844674407371E+19