curl_get_contents替代函数

当curl_get_contents出现failed to open stream: HTTP request failed! HTTP/1.1 403错误时，我们可以使用以下函数替代：

function curl_get_contents($url)
{
    $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $url);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
   curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13');
   $html = curl_exec($ch);
   $data = curl_exec($ch);
   curl_close($ch);
   return $data;
}