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

This article mainly introduces PHP's CURL method curl_setopt() function cases: 1. Simple case of crawling web pages; 2. POST data case

The curl_setopt() function can be used to quickly and easily crawl web pages (Collection is very convenient lol), curl_setopt is an extension library of PHP

Conditions of use: It needs to be configured and enabled in php.ini. (PHP 4 >= 4.0.2)
//Uncomment the following

extension=php_curl.dll

InLinux Next, you need to recompile PHP. When compiling, you need to turn on the compilation parameters - add the "-with-curl" parameter to the configure command.

1. A simple case of web crawling:

[php] view plain copy print?
// 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);

2. POST data case:

[php] view plain copy print?
// 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);

##3. About SSL and Cookie

Regarding SSL, which is the HTTPS protocol, you only need to change http:// in the CURLOPT_URL connection to https://. Of course, there is also a parameter called CURLOPT_SSL_VERIFYHOST that can be set to verify the site.

About Cookie, you need to understand the following three parameters:

• CURLOPT_COOKIE, set a cookie in the face-to-face session

• CURLOPT_COOKIEJAR, save a Cookie when the session ends

##CURLOPT_COOKIEFILE, Cookie file.

PS: Partial interception of Sina Weibo login API (I added some comments to some of them, and they are all translated as parameters. Haha) If you are interested, you can research it yourself and make it your own. use. Hehe

[php] view plain copy print?
/** 
   * 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; 
  }

The above is the entire content of this article, I hope it will help everyone learn Helps.

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