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run code in 150+ php & hhvm versions
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<?php var_dump( 0x000fffffffffffff ); // float 4503599627370500 var_dump( (int) 0x000fffffffffffff); // int -1 echo pow(2,53) -1;
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(4503599627370495) int(4503599627370495) 9007199254740991