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run code in 150+ php & hhvm versions
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<?php var_dump((int) ""); // int(0) var_dump((bool)0); // false var_dump((string) false); // ""
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(0) bool(false) string(0) ""
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/DCQ97 on line 4
Process exited with code 255.