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run code in 200+ php & hhvm versions
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<?php var_dump((string) 1 === (string)(int) '1'); var_dump((string) 1 === (string)(int) 1); var_dump(ctype_digit(1)); var_dump(ctype_digit('1'));
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.17.3, 7.0.0 - 7.2.6
bool(true) bool(true) bool(false) bool(true)