<?php /** * @ string 需要转换的文字 * @ encoding 目标编码 **/ function detect_encoding($string,$encoding = 'gbk'){ $is_utf8 = preg_match('%^(?:[\x09\x0A\x0D\x20-\x7E]| [\xC2-\xDF][\x80-\xBF]| \xE0[\xA0-\xBF][\x80-\xBF] | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} | \xED[\x80-\x9F][\x80-\xBF] | \xF0[\x90-\xBF][\x80-\xBF]{2} | [\xF1-\xF3][\x80-\xBF]{3} | \xF4[\x80-\x8F][\x80-\xBF]{2} )*$%xs', $string); if($is_utf8 && $encoding == 'utf8'){ return $string; }elseif($is_utf8){ return mb_convert_encoding($string, $encoding, "UTF-8"); }else{ return mb_convert_encoding($string, $encoding, 'gbk,gb2312,big5'); } } ?>
如果给的是Byte的数组buf，那么可以这样判断
UTF-8: (buf[0] == 0xEF) && (buf[1] == 0xBB) && (buf[2] == 0xBF)
UTF-32: (buf[0] == 0xFF) && (buf[1] == 0xFE) && (buf[2] == 0×00) && (buf[3] == 0×00)
UTF-16/16LE: (buf[0] == 0xFF) && (buf[1] == 0xFE) && (buf[2] != 0×00) && (buf[3] != 0×00)
UTF-16BE: (buf[0] == 0xFE) && (buf[1] == 0xFF)
UTF-32BE: (buf[0] == 0×00) && (buf[1] == 0×00) && (buf[2] == 0xFE) && (buf[3] == 0xFF)
剩下的是ANSI类的编码
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