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run code in 200+ php & hhvm versions
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<?php var_dump(ctype_digit(343443)); var_dump((float)123);
Output for 4.3.10 - 4.4.9, 5.0.3 - 7.1.7, 7.2.0
bool(true) float(123)
Output for 7.1.10

Process exited with code 137.
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.2

Process exited with code 139.