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run code in 200+ php & hhvm versions
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<?php var_dump(is_numeric('01')); var_dump(is_numeric('1')); var_dump(is_numeric(1));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
bool(true) bool(true) bool(true)