PHP cURL初始化和执行方法入门级代码

这个是采集基础，最好熟悉一下

    $ch = curl_init();
    # 设定url和把结果返回，是否返回头部
    curl_setopt($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);