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run code in 200+ php & hhvm versions
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<?php var_dump(is_numeric("1e3445")); var_dump(is_numeric("1e344d5"));
based on 5kb5a
Output for 5.2.1 - 7.2.0
bool(true) bool(false)
Output for 4.3.0 - 5.2.0
bool(false) bool(false)