curl 相关知识

$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, 5);


# 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);


# 执行
curl_setopt($this->ch, CURLOPT_NOSIGNAL, 1);
$response = curl_exec($ch);
if(curl_errno($ch)){
    curl_error($ch);
    exit();
}
curl_close($ch);