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<?php error_reporting(E_ALL); $foo = 42; var_dump(strlen($foo)); var_dump(ctype_digit($foo)); var_dump(date($foo, '123'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(2) bool(false) string(2) "42"