php curl常用用法

一个简单的例子


先简单说一下语法,$ch=curl_init()创建了一个curl会话,成功返回一个句柄。curl_setopt($ch,CURLOPT_URL,"baidu.com")设置url,上面可以通过$ch=curl_init(“baidu.com”)实现。curl_setopt($ch,CURLOPT_RETURNTRANSFER,0)是否将结构存入变量,1是存入,0是直接echo出去。$output=curl_exce($ch)直接执行结果存入$output,然后echo出去。curl_close($ch)

1、实现http get请求


2、实现http post请求

"li",
               "msg"=>"are you ok"
         );
         $ch=curl_init();
         curl_setopt($ch,CURLOPT_URL,"http://测试服务器的IP马赛克/testRespond.php");
         curl_setopt($ch,CURL_POST,1);
         curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,60);
         curl_setopt($ch,CURLOPT_POSTFIELDS,http_build_query($data));
         curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
         $output=curl_exce($sh);
         curl_close($ch)
?>

浏览器运行结果是:

name=Lei&msg=Are you OK?

这里我们是构造了一个数组作为POST数据传给服务器:
curl_setopt($ch, CURLOPT_POST, 1)表明是POST请求;

curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60)设置一个最长的可忍受的连接时间,秒为单位,总不能一直等下去变成木乃伊吧;

curl_setopt($ch, CURLOPT_POSTFIELDS , http_build_query($data))设置POST的数据域,因为这里是数组数据形式的(等会来讲json格式),所以用http_build_query处理一下。

3、通过json实现http post请求

      $data={"name":"li","msg":"are you ok"};
      $ch=curl_init();
      curl_setopt($ch,CURLOPT_URL,"http://测试服务器的IP马赛克/testRespond.php");
      curl_setopt($ch,CURLOPT_POST,1);
      curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,60);
      curl_setopt($ch,CURLOPT_HTTPHEADER,array('Content-Type: application/json', 'Content-Length:' . strlen($data)));
      curl_setopt($ch,CURLOPT_POSTFIELDS ,data);
      curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
      $output=curl_exce($ch);
      echo $output;
      curl_close($output);

4、上传图片

远程服务器


然后我们再来写我们本地服务器的php curl部分:
php5.3实现方法

$data = array('name'=>'boy', "upload"=>"@boy.png");
$ch=curl_init();
curl_setopt($ch,CURLOPT_URL,"http://远程服务器地址马赛克/testRespond.php");
curl_setopt($ch,CURLOPT_POST,1);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,60);
curl_setopt($ch,CURLOPT_POSTFIELDS,$data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
echo $output;
curl_close($ch);

下面来讲PHP5.6及以后的实现:

'boy', "upload"=>"");
       $ch = curl_init();
       $data['upload']=new CURLFile(realpath(getcwd().'/boy.png'));
       curl_setopt($ch, CURLOPT_URL, "http://115.29.247.189/test/testRespond.php");
       curl_setopt($ch, CURLOPT_POST, 1); 
       curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60);
       curl_setopt($ch, CURLOPT_POSTFIELDS , $data);
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
       $output = curl_exec($ch);
       echo $output;
       curl_close($ch);
 ?>

5、远程获取图片

$ch = curl_init(); 
$fp=fopen('./girl.jpg', 'w');
curl_setopt($ch, CURLOPT_URL, "http://远程服务器地址马赛克/girl.jpg");
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60);
curl_setopt($ch, CURLOPT_FILE, $fp); 
$output = curl_exec($ch);
$info = curl_getinfo($ch); 
fclose($fp);
$size = filesize("./girl.jpg");
if ($size != $info['size_download']) {
     echo "下载的数据不完整,请重新下载";
 } else {
     echo "下载数据完整";
 }
curl_close($ch);

6、HTTP认证

function curl_auth($url,$user,$passwd){
    $ch = curl_init();
    curl_setopt_array($ch, [
        CURLOPT_USERPWD => $user.':'.$passwd,
        CURLOPT_URL     => $url,
        CURLOPT_RETURNTRANSFER => true
    ]);
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
}
$authurl = 'http://要请求HTTP认证的地址';
echo curl_auth($authurl,'vace','passwd');

7、利用cookie模拟登陆

首先我们先来分析一下,这个事情分两步,一是去登陆界面通过账号密码登陆,然后获取cookie,二是去利用cookie模拟登陆到信息页面获取信息,大致的框架是这样的。

 '账户', 
    'pwd' => '密码'
  ); 
  //登录地址  
  $url = "登陆地址";  
  //设置cookie保存路径  
  $cookie = dirname(__FILE__) . '/cookie.txt';  
  //登录后要获取信息的地址  
  $url2 = "登陆后要获取信息的地址";  
  //模拟登录 
  login_post($url, $cookie, $post);  
  //获取登录页的信息  
  $content = get_content($url2, $cookie);  
  //删除cookie文件 
  @ unlink($cookie);
  var_dump($content);    
?>

然后我们思考下下面两个方法的实现:

login_post($url, $cookie, $post)
get_content($url2, $cookie)
//模拟登录  
function login_post($url, $cookie, $post) { 
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 0);
    curl_setopt($curl, CURLOPT_COOKIEJAR, $cookie);
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($post));
    curl_exec($curl); 
    curl_close($curl);
} 
//登录成功后获取数据  
function get_content($url, $cookie) { 
    $ch = curl_init(); 
    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_HEADER, 0); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
    curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie); 
    $rs = curl_exec($ch); 
    curl_close($ch); 
    return $rs; 
} 

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