# 如何实现模拟登录？
### 如何实现模拟登录？
> 通过模拟登录, 可以解决登录后才能爬取某些网站数据的问题.\
> PHPSpider框架提供两种登录方式：
>
> > 1、通过发送HTTP请求来实现模拟登录\
> > 2、从Chrome浏览器拷贝Cookie字符串
#### 通过发送HTTP请求来实现模拟登录
举个栗子:
```
// 登录请求url
$login_url = "http://www.waduanzi.com/login?url=http%3A%2F%2Fwww.waduanzi.com%2F";
// 提交的参数
$params = array(
"LoginForm[returnUrl]" => "http%3A%2F%2Fwww.waduanzi.com%2F",
"LoginForm[username]" => "13712899314",
"LoginForm[password]" => "854230",
"yt0" => "登录",
);
// 发送登录请求
requests::post($login_url, $params);
// 登录成功后本框架会把Cookie保存到www.waduanzi.com域名下，我们可以看看是否是已经收集到Cookie了
$cookies = requests::get_cookies("www.waduanzi.com");
print_r($cookies); // 可以看到已经输出Cookie数组结构
// requests对象自动收集Cookie，访问这个域名下的URL会自动带上
// 接下来我们来访问一个需要登录后才能看到的页面
$url = "http://www.waduanzi.com/member";
$html = requests::get($url);
echo $html; // 可以看到登录后的页面，非常棒👍
```
#### `如何获得提交参数？`
登录需要登录验证信息，下面我们来看看如何获得一个网站所需要的登录信息\
还是以挖段子([www.waduanzi.com)为例，看看如何获得下面的信息](http://www.waduanzi.com\)为例，看看如何获得下面的信息)
**1、打开挖段子网站点击登录按钮进入登陆页：**\
`http://www.waduanzi.com/login?url=http%3A%2F%2Fwww.waduanzi.com%2F`
**2、鼠标点击右键 -> 检查 从而打开Chrome浏览器的开发者工具**
**选择Network选项卡，勾选Preserve log选项**
**3、填写登陆信息点击登录按钮，得到登录验证URL**
**4、上面的登录提交字段填入框架代码**
```
$params => array(
"LoginForm[returnUrl]" => "http%3A%2F%2Fwww.waduanzi.com%2F",
"LoginForm[username]" => "用户名",
"LoginForm[password]" => "密码",
"yt0" => "登录",
)
```
#### 从Chrome浏览器拷贝Cookie字符串
上面的方式适用于简单的登录验证方式，如果遇到验证码，token表单字段，还有各种用js加密算法生成的登录字段，模拟登录就会变得异常复杂，为了节省时间，我们一般人工登录后，拷贝Cookie字符串来登录
**1、登录成功后，在跳转的页面找Cookie字符串**
**2、上面的登录提交字段填入框架代码**
```
// 模拟登录
$cookies = "复制上面Cookie:后面那一串字符串...";
requests::set_cookies($cookies, 'www.waduanzi.com');
// 接下来我们来访问一个需要登录后才能看到的页面
$url = "http://www.waduanzi.com/member";
$html = requests::get($url);
echo $html; // 可以看到登录后的页面，非常棒👍
```
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