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run code in 150+ php & hhvm versions
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<?php var_dump(is_numeric(md5('0e2345'))); var_dump(md5('0e2345'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) string(32) "188b4b9ecdfde04fe00149dd77d939bc"