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run code in 150+ php & hhvm versions
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<?php $bits = 32; $N = 0xfffffffb; var_dump(pow(2,32),$N); var_dump((int) -(pow(2, $bits) - $N)); // -5
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(4294967296) int(4294967291) int(-5)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/l7R7d on line 5
Process exited with code 255.