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run code in 150+ php & hhvm versions
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<?php var_dump(ctype_alnum('text')); var_dump(ctype_alnum('342')); var_dump(ctype_alnum(1423));
based on N3Wmt
Output for 4.3.10 - 4.4.9, 5.0.3 - 7.1.0
bool(true) bool(true) bool(true)
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.2
bool(true) bool(true) bool(false)