如何处理json中的非法utf8字符

参考：https://magp.ie/2011/01/06/remove-non-utf8-characters-from-string-with-php/ //reject overly long 2 byte sequences, as well as characters above U+10000 and replace with ? $some_string = preg_replace('/[\x00-\x08\x10\x0B\x0C\x0E-\x19\x7F]'. '|[\x00-\x7F][\x80-\xBF]+'. '|([\xC0\xC1]|[\xF0-\xFF])[\x80-\xBF]*'. '|[\xC2-\xDF]((?![\x80-\xBF])|[\x80-\xBF]{2,})'. '|[\xE0-\xEF](([\x80-\xBF](?![\x80-\xBF]))|(?![\x80-\xBF]{2})|[\x80-\xBF]{3,})/S', '?', $some_string ); //reject overly long 3 byte sequences and UTF-16 surrogates and replace with ? $some_string = preg_replace('/\xE0[\x80-\x9F][\x80-\xBF]'.

'|\xED[\xA0-\xBF][\x80-\xBF]/S','?', $some_string );