curl_init() 示例,只输出返回结果
$ch = curl_init();
	   curl_setopt($ch, CURLOPT_URL, $url);
	   curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:26.0) Gecko/20100101 Firefox/26.0");
	   curl_setopt($ch, CURLOPT_REFERER,$url);
	   curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);
	   curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
	   curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
	   curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
	   
	   $r = curl_exec($ch);
	   curl_close($ch);
	   return $r;