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    <?php
    /**
     * È¡Îļþ×iºo$nÐÐ
     * 
     * @param string $filename ÎļþÂ*¾¶
     * @param int $n ×iºo¼¸ÐÐ
     * @return mixed false±iʾÓдiÎo£¬³É¹¦Ôo*µ»Ø×Ö*u´®
     */
    function FileLastLines($filename, $n){
       if(!$fp = fopen($filename, 'r')){
        echo "´o¿ªÎļþʧ°Ü£¬Çe¼i²eÎļþÂ*¾¶ÊÇ*ñÕýÈ*£¬Â*¾¶ºÍÎļþÃu²»Òª°uº¬ÖÐÎÄ";
        return false;
        }
      $pos = -2;
      $eof = "";
      $str = "";
      while($n > 0){
        while($eof != "n"){
          if(!fseek($fp, $pos, SEEK_END)){
            $eof = fgetc($fp);
            $pos¨C;
            }else{
            break;
            }
          }
        $str .= fgets($fp);
        $eof = "";
        $n¨C;
        }
      return $str;
      }

    echo nl2br(FileLastLines('sss.txt', 4));
    /**
     * * * È¡Îļþ×iºo$nÐÐ *
     * 
     * @param string $filename ÎļþÂ*¾¶ *
     * @param int $n ×iºo¼¸ÐÐ *
     * @return mixed false±iʾÓдiÎo£¬³É¹¦Ôo*µ»Ø×Ö*u´®
     */
    function FileLastLines($filename, $n){
      if(!$fp = fopen($filename, 'r')){
        echo "´o¿ªÎļþʧ°Ü£¬Çe¼i²eÎļþÂ*¾¶ÊÇ*ñÕýÈ*£¬Â*¾¶ºÍÎļþÃu²»Òª°uº¬ÖÐÎÄ";
        return false;
        }
      $pos = -2;
      $eof = "";
      $str = "";
      while($n > 0){
        while($eof != "n"){
          if(!fseek($fp, $pos, SEEK_END)){
            $eof = fgetc($fp);
            $pos--;
            }else{
            break;
            }
          }
        $str .= fgets($fp);
        $eof = "";
        $n--;
        }
      return $str;
      }
    echo nl2br(FileLastLines('sss . txt', 4));

    function tail($fp, $n, $base = 5)
    {
      assert($n > 0);
      $pos = $n + 1;
      $lines = array();
      while(count($lines) < = $n){
        try{
          fseek($fp, - $pos, SEEK_END);
          }
        catch (Exception $e){
          fseek(0);
          break;
          }
        $pos *= $base;
        while(!feof($fp)){
          array_unshift($lines, fgets($fp));
          }
        }
      return array_slice($lines, 0, $n);
      }
    var_dump(tail(fopen("access.log", "r+"), 10));
    $fp = fopen($file, "r");
    $line = 10;
    $pos = -2;
    $t = " ";
    $data = "";
    while ($line > 0){
      while ($t != "n"){
        fseek($fp, $pos, SEEK_END);
        $t = fgetc($fp);
        $pos --;
        }
      $t = " ";
      $data .= fgets($fp);
      $line --;
      }
    fclose ($fp);
    echo $data;
    ?>

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