php获取数据为什么curl获取不完整

以下是一个更完整的curl的封装，可以相对的比较好的获取页面信息，curl的获取当数据量过大时，会分批进行数据获取，本地进行数据重组

function req_curl($url, &$status = null, $options = array())

{

    $res = '';

    $options = array_merge(array(

        'follow_local' => true,

        'timeout' => 30,

        'max_redirects' => 4,

        'binary_transfer' => false,

        'include_header' => false,

        'no_body' => false,

        'cookie_location' => dirname(__FILE__) . '/cookie',

        'useragent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1',

        'post' => array() ,

        'referer' => null,

        'ssl_verifypeer' => 0,

        'ssl_verifyhost' => 0,

        'headers' => array(

            'Expect:'

        ) ,

        'auth_name' => '',

        'auth_pass' => '',

        'session' => false

    ) , $options);

    $options['url'] = $url;

$s = curl_init();

if (!$s) return false;

curl_setopt($s, CURLOPT_URL, $options['url']);

    curl_setopt($s, CURLOPT_HTTPHEADER, $options['headers']);

    curl_setopt($s, CURLOPT_SSL_VERIFYPEER, $options['ssl_verifypeer']);

    curl_setopt($s, CURLOPT_SSL_VERIFYHOST, $options['ssl_verifyhost']);

    curl_setopt($s, CURLOPT_TIMEOUT, $options['timeout']);

    curl_setopt($s, CURLOPT_MAXREDIRS, $options['max_redirects']);

    curl_setopt($s, CURLOPT_RETURNTRANSFER, true);

    curl_setopt($s, CURLOPT_FOLLOWLOCATION, $options['follow_local']);

    curl_setopt($s, CURLOPT_COOKIEJAR, $options['cookie_location']);

    curl_setopt($s, CURLOPT_COOKIEFILE, $options['cookie_location']);

    if (!empty($options['auth_name']) && is_string($options['auth_name']))

    {

        curl_setopt($s, CURLOPT_USERPWD, $options['auth_name'] . ':' . $options['auth_pass']);

    }

    if (!empty($options['post']))

    {

        curl_setopt($s, CURLOPT_POST, true);

        curl_setopt($s, CURLOPT_POSTFIELDS, $options['post']);

        //curl_setopt($s, CURLOPT_POSTFIELDS, array('username' => 'aeon', 'password' => '111111'));

    }

    if ($options['include_header'])

    {

        curl_setopt($s, CURLOPT_HEADER, true);

    }

    if ($options['no_body'])

    {

curl_setopt($s, CURLOPT_NOBODY, true);

    }

    if ($options['session'])

    {

        curl_setopt($s, CURLOPT_COOKIESESSION, true);

        curl_setopt($s, CURLOPT_COOKIE, $options['session']);

    }

    curl_setopt($s, CURLOPT_USERAGENT, $options['useragent']);

    curl_setopt($s, CURLOPT_REFERER, $options['referer']);

    $res = curl_exec($s);

    $status = curl_getinfo($s, CURLINFO_HTTP_CODE);

    curl_close($s);

    return $res;

}