2)PHP中把读取.txt中内容并转为UTF-8格式

 <?php

 $filename = "filename.txt";
 $handle = fopen($filename, "r");//读取二进制文件时，需要将第二个参数设置成'rb'
 //通过filesize获得文件大小，将整个文件一下子读到一个字符串中
 $contents = fread($handle, filesize ($filename));
 $e=mb_detect_encoding($contents, array('UTF-8', 'CP936'));
 switch($e){
     case 'UTF-8':
             break;
     case 'CP936':$contents=iconv("GB2312", "UTF-8", $contents);
            break;
 }
 fclose($handle);

 ?>