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

回复讨论(解决方案)

$i = 0;
while(!eof($f) and $i  xxxx;
 $i++;
}