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run code in 150+ php & hhvm versions
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<?php var_dump(0xffffffffffffffff); printf("%u\n",0xffffffffffffffff); printf("%d",0xffffffffffffffff);
Output for 4.3.0 - 5.0.1, 5.0.3 - 7.1.0
float(1.844674407371E+19) 0 0
Output for 5.0.2
float(1.844674407371E+19) 4294967295 9223372036854775807