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run code in 200+ php & hhvm versions
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<?php setlocale(LC_CTYPE, 'cs_CZ.utf-8'); var_dump(ctype_alpha('č'));
based on 4RsPg
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
bool(false)