php自动识别文字编码并转换

2. /**
3. * @ string 需要转换的文字
4. * @ encoding 目标编码
5. **/
6. function detect_encoding($string,$encoding = 'gbk'){
7. $is_utf8 = preg_match('%^(?:[\x09\x0a\x0d\x20-\x7e]| [\xc2-\xdf][\x80-\xbf]| \xe0[\xa0-\xbf][\x80-\xbf] | [\xe1-\xec\xee\xef][\x80-\xbf]{2} | \xed[\x80-\x9f][\x80-\xbf] | \xf0[\x90-\xbf][\x80-\xbf]{2} | [\xf1-\xf3][\x80-\xbf]{3} | \xf4[\x80-\x8f][\x80-\xbf]{2} )*$%xs', $string);
8. if($is_utf8 && $encoding == 'utf8'){
9. return $string;
10. }elseif($is_utf8){
11. return mb_convert_encoding($string, $encoding, "utf-8");
12. }else{
13. return mb_convert_encoding($string, $encoding, 'gbk,gb2312,big5');
14. }
15. }

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