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run code in 150+ php & hhvm versions
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<?php $packed = pack('V',PHP_INT_MAX / 2); var_dump(PHP_INT_MAX,$packed); //echo unpack('i', $packed)[1];
Output for 4.4.0 - 4.4.9, 5.0.5, 5.1.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(9223372036854775807) string(4) ""
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/Vaar9 on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 5.0.0 - 5.0.4
Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/Vaar9 on line 4 Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/Vaar9 on line 6 string(11) "PHP_INT_MAX" string(4) ""