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<?php mb_internal_encoding('UTF-8'); $value = 'g' . chr(0xa4) .'eld'; mb_substitute_character('long'); $originalValue = $value; var_dump(mb_detect_encoding($value, mb_detect_order())); $value = mb_convert_encoding($value, 'UTF-8'); var_dump($value, mb_strlen($value, 'UTF-8'), mb_strlen($originalValue));
Output for 8.3.0 - 8.3.6
string(5) "ASCII" string(5) "g?eld" int(5) int(5)
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
bool(false) string(5) "g?eld" int(5) int(5)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
bool(false) string(10) "gBAD+A4eld" int(10) int(5)
Output for 4.3.4 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
bool(false) string(4) "geld" int(4) int(5)
Output for 4.3.0 - 4.3.3
string(4) "SJIS" string(4) "geld" int(4) int(5)

preferences:
258.12 ms | 401 KiB | 346 Q