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run code in 200+ php & hhvm versions
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<?php $a = (int)2 ** 63 -1; $b = 0x7FFFFFFFFFFFFFFF; var_dump(($a == $b) === true); var_dump((0x7FFFFFFFFFFFFFFF == (2 ** 63 -1)) === true);
based on YiLpj
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
bool(false) bool(true)