Detailed explanation of PHP's CURL method curl_setopt() function case

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// 创建一个新cURL资源 
$ch = curl_init();  
// 设置URL和相应的选项 
curl_setopt($ch, CURLOPT_URL, "http://www.baidu.com/"); 
curl_setopt($ch, CURLOPT_HEADER, false);  
// 抓取URL并把它传递给浏览器 
curl_exec($ch); 
//关闭cURL资源，并且释放系统资源 
curl_close($ch);

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// 创建一个新cURL资源 
$ch = curl_init(); 
$data = 'phone='. urlencode($phone); 
// 设置URL和相应的选项 
curl_setopt($ch, CURLOPT_URL, "http://www.post.com/"); 
curl_setopt($ch, CURLOPT_POST, 1); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $data); 
// 抓取URL并把它传递给浏览器 
curl_exec($ch); 
//关闭cURL资源，并且释放系统资源 
curl_close($ch);

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/** 
   * Make an HTTP request 
   * 
   * @return string API results 
   * @ignore 
   */ 
  function http($url, $method, $postfields = NULL, $headers = array()) { 
    $this->http_info = array(); 
    $ci = curl_init(); 
    /* Curl settings */ 
    curl_setopt($ci, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);//让cURL自己判断使用哪个版本 
    curl_setopt($ci, CURLOPT_USERAGENT, $this->useragent);//在HTTP请求中包含一个"User-Agent: "头的字符串。 
    curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, $this->connecttimeout);//在发起连接前等待的时间，如果设置为0，则无限等待 
    curl_setopt($ci, CURLOPT_TIMEOUT, $this->timeout);//设置cURL允许执行的最长秒数 
    curl_setopt($ci, CURLOPT_RETURNTRANSFER, TRUE);//返回原生的（Raw）输出 
    curl_setopt($ci, CURLOPT_ENCODING, "");//HTTP请求头中"Accept-Encoding: "的值。支持的编码有"identity"，"deflate"和"gzip"。如果为空字符串""，请求头会发送所有支持的编码类型。 
    curl_setopt($ci, CURLOPT_SSL_VERIFYPEER, $this->ssl_verifypeer);//禁用后cURL将终止从服务端进行验证 
    curl_setopt($ci, CURLOPT_HEADERFUNCTION, array($this, 'getHeader'));//第一个是cURL的资源句柄，第二个是输出的header数据 
    curl_setopt($ci, CURLOPT_HEADER, FALSE);//启用时会将头文件的信息作为数据流输出 
    switch ($method) { 
      case 'POST': 
        curl_setopt($ci, CURLOPT_POST, TRUE); 
        if (!empty($postfields)) { 
          curl_setopt($ci, CURLOPT_POSTFIELDS, $postfields); 
          $this->postdata = $postfields; 
        } 
        break; 
      case 'DELETE': 
        curl_setopt($ci, CURLOPT_CUSTOMREQUEST, 'DELETE'); 
        if (!empty($postfields)) { 
          $url = "{$url}?{$postfields}"; 
        } 
    } 
    if ( isset($this->access_token) && $this->access_token ) 
      $headers[] = "Authorization: OAuth2 ".$this->access_token; 
    $headers[] = "API-RemoteIP: " . $_SERVER['REMOTE_ADDR']; 
    curl_setopt($ci, CURLOPT_URL, $url ); 
    curl_setopt($ci, CURLOPT_HTTPHEADER, $headers ); 
    curl_setopt($ci, CURLINFO_HEADER_OUT, TRUE ); 
    $response = curl_exec($ci); 
    $this->http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE); 
    $this->http_info = array_merge($this->http_info, curl_getinfo($ci)); 
    $this->url = $url; 
    if ($this->debug) { 
      echo "=====post data======\r\n"; 
      var_dump($postfields); 
 
      echo '=====info====='."\r\n"; 
      print_r( curl_getinfo($ci) ); 
 
      echo '=====$response====='."\r\n"; 
      print_r( $response ); 
    } 
    curl_close ($ci); 
    return $response; 
  }