php curl 获取信息不完整

用 php curl 获取页面数据，页面有1000条数据，有时候可以获得1000条，有时候获得500条，600条，
有时候会不完整，求解，这是为啥

$ch = curl_init();            curl_setopt ($ch, CURLOPT_URL, $url);           curl_setopt ($ch, CURLOPT_COOKIEJAR, "c:\cookie.txt");       curl_setopt ($ch, CURLOPT_HEADER, 1);       curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);       curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);	   curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:'));       curl_setopt ($ch, CURLOPT_TIMEOUT, 120);       $result = curl_exec ($ch);       curl_close($ch);     echo $result;

回复讨论(解决方案)

curl_setopt ($ch, CURLOPT_TIMEOUT, 120);

???300看看。