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<?php $str = mb_convert_encoding("ア", 'JIS', 'UTF-8'); var_dump(mb_detect_encoding($str, 'JIS')); var_dump(mb_detect_encoding($str, 'JIS', true)); var_dump(mb_detect_encoding($str, 'JIS', false)); var_dump(mb_detect_encoding($str, 'ASCII')); var_dump(mb_detect_encoding($str, 'ASCII', true)); var_dump(mb_detect_encoding($str, 'ASCII', false)); var_dump(mb_detect_encoding($str, ['ASCII', 'JIS'])); var_dump(mb_detect_encoding($str, ['ASCII', 'JIS'], true)); var_dump(mb_detect_encoding($str, ['ASCII', 'JIS'], false));
Output for 8.1.0 - 8.1.33, 8.2.1 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
string(3) "JIS" string(3) "JIS" string(3) "JIS" string(5) "ASCII" string(5) "ASCII" string(5) "ASCII" string(3) "JIS" string(3) "JIS" string(3) "JIS"
Output for 8.2.0
string(3) "JIS" bool(false) string(3) "JIS" string(5) "ASCII" string(5) "ASCII" string(5) "ASCII" string(5) "ASCII" string(5) "ASCII" string(5) "ASCII"
Output for 8.0.1 - 8.0.30
string(3) "JIS" string(3) "JIS" string(3) "JIS" bool(false) bool(false) bool(false) string(3) "JIS" string(3) "JIS" string(3) "JIS"

preferences:
91.81 ms | 408 KiB | 5 Q