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function toFixLen($str,$len){ //¹Ì¶¨³¤¶È×Ö·û´®µÄ½ØÈ¡   
  
    if($len>=strlen($str)||!$len) return $str;   
  
    $len-=3;   
  
    $tempstr1 = substr($str,0,$len); //½ØÈ¡×Ö·û´®   
  
    $tempstr2 = preg_replace('/([\x81-\xff]+)$/ms','',$tempstr1,1); //È¥µô½áβµÄÁ¬Ðøºº×Ö×Ö·û   
  
    if(!is_int((strlen($tempstr1)-strlen($tempstr2))/2)){ //È¥µôµÄ×Ö·ûÎªÆæÊý?   
  
        $tempstr1 = substr($str,0,$len-1);   
  
    }   
  
    return $tempstr1."…";   
  
}   
  
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