2019-09-16 curl简单操作

1.get请求 （使用file_get_contents（）函数也可以实现get请求）

//http_build_query() 构造一个url字符串
    function http_get($url)
    {
        //1.初始化curl
        $ch = curl_init();
        //2.设置参数
        curl_setopt($ch, CURLOPT_URL, $url);//指定网址
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);//返回信息的数据类型为字符串
        //3.执行
        $output = curl_exec($ch);
        echo $output;
        //4.关闭
        curl_close($ch);

    }
    //调用get
    $data = array(
      "data" =>"123456"
    );
    $url = "http://www.test.com/curl/curl_login.php?".http_build_query($data);

    http_get($url);

2.post模拟登陆

/*post 已经封装*/
    function login($url,$post_data)
    {
        //初始化curl
        $ch = curl_init();
        //跳转网址
        curl_setopt($ch, CURLOPT_URL, $url);
        //设置头文件
        curl_setopt($ch, CURLOPT_HEADER, 0);
        //返回信息的数据类型为字符串
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        //设置post
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
        //执行命令
        $output = curl_exec($ch);
       return $output;
        //关闭curl
        curl_close($ch);
    }

/*调用封装好的方法*/
    $url = "http://www.test.com/curl/curl_login.php";
    $post_data = array(
      "name"=>"wangwu",
        "password"=>"1234567"
    );
    $resultarr =  login($url,$post_data);
    $result = json_decode($resultarr,true);
    if($result['status']==1){
        echo $result['info'];
    }else{
        echo $result['info'];
    }

处理页面

//声明方法
    function info($status=0,$data="",$lan="1"){
        $info=array(
            "status"=>"$status",
            "info"=>"$lan",
            "data"=>"$data"
        );
        echo  json_encode($info);
        die();
    }

    //接值
    $name = $_POST['name'];
    $password = $_POST['password'];

   //PDO链接数据库
    $dsn = "mysql:host=127.0.0.1;port=3306;charset=utf8;dbname=news";
    $pdo = new PDO($dsn,"root","root");

    //sql语句
    $sql = "select * from user where name = '$name'";
    $namedata = $pdo->query($sql);
    $nameresult = $namedata->fetch(PDO::FETCH_ASSOC);
    if($nameresult){
        if($nameresult['password']==$password){
            info("1","","登陆成功");
        }else{
            info("3","","登陆失败 原因是：密码有误");
        }
    }else{
       info("2","","登录失败 原因是：不存在的账户");
    }