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run code in 200+ php & hhvm versions
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<?php $str2 = "Trait&AOk-"; var_dump(mb_detect_encoding($str2, 'CP936')); var_dump(mb_detect_encoding($str2, 'EUC-CN')); var_dump(mb_detect_encoding($str2, 'UTF-8'));
based on sjMd8
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
string(5) "CP936" string(6) "EUC-CN" string(5) "UTF-8"