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<?php var_dump( // true 18446744073709552000 > PHP_INT_MAX, // true, as expected.. (18446744073709552000-PHP_INT_MAX) > -1, // false!? wtf? ((int)(18446744073709552000-PHP_INT_MAX)) > -1, // 9223372036854775808 number_format((18446744073709552000-PHP_INT_MAX),0,'.',''), // false: 9223372036854775808 > PHP_INT_MAX, // false!? wtf? ((int)((float)9223372036854775808)) > -1, // ok: float(9.2233720368548E+18) ((float)9223372036854775808), // VERY WRONG: int(-9223372036854775808) ((int)((float)9223372036854775808)) );

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