采集网站内容，停止在多少行！怎么操作

采集网站内容，停止在多少行！如何操作！

function get_content_by_socket($url){ 

$url = eregi_replace('^http://', '', $url);

$temp = explode('/', $url);

$host = array_shift($temp);

$url = ''.implode('/', $temp);

$temp = explode(':', $host);

$host = $temp[0];

$port = isset($temp[1]) ? $temp[1] : 80;

//echo $url;

//echo $host;

   $fp = fsockopen($host, 80) or die("Open ". $url ." failed"); 

    $header = "GET /".$url ." HTTP/1.1\r\n"; 

    $header .= "Accept: */*\r\n"; 

    $header .= "Accept-Language: zh-cn\r\n"; 

   $header .= "Accept-Encoding: gzip, deflate\r\n"; 

   $header .= "If-Modified-Since: Tue, 06 Apr 2010 07:56:03 GMT; length=2235\r\n"; 

    $header .= "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)\r\n"; 

    $header .= "Host: ". $host ."\r\n"; 

	$header .= "Referer: http://video.baidu.com/v?word=11&ct=301989888&rn=20&pn=0&db=0&s=0&fbl=800\r\n"; 

	//fputs($content, "Referer: $domainrn");//伪造部分 

    $header .= "Connection: Keep-Alive\r\n"; 

    $header .= "Cookie: BAIDUID=5F96971273579588527A980F307E8B7A:FG=1\r\n\r\n"; 

    //$header .= "Connection: Close\r\n\r\n"; 



    fwrite($fp, $header); 

    while (!feof($fp)) { 

        $contents .= fgets($fp, 8192); 

    } 

    fclose($fp); 

    return $contents; 

} 

以这个函数与为例

只要读取到第10行，下面的就不取了直接结束输出内容！这样取到了自己想要的，节省时间资源！
或者只读取到 自定义哪个字段
可实现吗

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------解决方案--------------------
$i = 0;
while(!eof($f) and $i<10) {
xxxx;
$i++;
}