PHP中一个控制字符串输出的函数

function rep($str,$len)

{   
    $strlen=strlen($str);   
    $i=0;
    $finst来源gaodaima#com搞(代@码网r=””;
    $pos=0;

    while($i<$strlen)   
    {   
      $s1=substr($str,$i,1);
      $s2=ord($s1);
      if($s2>0xa0){

          $finstr.=substr($str,$i,2);  
          $pos+=2;
          $i+=2;

      }else{

          switch($s2){
             case 13:  
              $finstr.=”
“;
              $pos=0;
              break;
             case 10:                
              $pos=0;
              break;              
             case 32;              
                 $finstr.=” “;
                 $pos++;
                 break;
             default:                       
              $finstr.=htmlspecialchars($s1);  
              $pos++;     
              break;
          }       

          $i++;  

       } //if

    if($pos>=$len){     
          $finstr.=”
“;
          $pos=0;
    }

    }  //while
    return $finstr;   
}