$ch = curl_init();
# 设定url和把结果返回，是否返回头部
curl_setopt($ch, CURLOPT_URL, 'http://www.baidu.com/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($this->ch, CURLOPT_HEADER, 1);

# cookie文件设定
curl_setopt($this->ch, CURLOPT_COOKIEJAR, $cookie_file);
curl_setopt($this->ch, CURLOPT_COOKIEFILE, $cookie_file);

# 额外头部
curl_setopt($this->ch, CURLOPT_HTTPHEADER, array('User-Agent: Mozilla/5.0'));

# 设定post
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $poststring);

# 连接、执行过期时间
curl_setopt($this->ch, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($this->ch, CURLOPT_TIMEOUT, 30);

# 是否跟随301 302
curl_setopt($this->ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($this->ch, CURLOPT_MAXREDIRS, 10);

# refer
curl_setopt($this->ch, CURLOPT_REFERER, $refer);

# http版本和端口重用设置
curl_setopt($this->ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($this->ch, CURLOPT_FORBID_REUSE, 1);

# 支持https
curl_setopt($this->ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($this->ch, CURLOPT_SSL_VERIFYHOST, 0);

# 如果需要进行毫秒超时，需要增加：
curl_setopt($this->ch, CURLOPT_NOSIGNAL, 1);

# 执行
$response = curl_exec($ch);
if(curl_errno($ch)){
  curl_error($ch);
  exit();
}
curl_close($ch);