作者：温新

时间：2021-06-26

请求有什么作用？通过前面视图的介绍，已经制作了一个简单的form表单，那么form所提交的表单数据怎么处理？这就需要Laravel请求实例Reuqest来处理了。

用一句话来概括，请求实例就是用来处理用户数据。

优雅的请求实例

说明：为了演示，请删除上篇文章演示的中间件功能，并恢复路由为Route::get('demo', 'DemoController@index');

来回顾一下store方法，可以看到，stroe方法一个参数$requst，这个参数是实例参数，其类为Illuminate\Http\Request。

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// DemoController.php</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(152, 26, 26)"><?</span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">php</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(119, 0, 136)">namespace</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">App\Http\Controllers</span>;</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(119, 0, 136)">use</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">Illuminate\Http\Request</span>;</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(119, 0, 136)">class</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">DemoController</span> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">extends</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">Controller</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">{</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(119, 0, 136)">public</span> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">function</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">store</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 0)">Request</span> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span>)</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">        <span style="box-sizing: border-box;color: rgb(0, 0, 0)">dd</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">all</span>());</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">}</span>

获取表单数据

获取用户提交表单数据的值，可以使用Illuminate/Http/Request实例，其封装了很多实用的方法。

获取表单所有数据

all方法以数组方式获取所有输入的值。现在可以尝试提交表单数据了，然后使用all方法接收所提交数据的值。

$data = $request->all();

获取一个值

input方法获取提交表单数据中的一个值。

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 方式一</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 85, 170)">$username</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">input</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'username'</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 方式二 可以指定默认值</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 85, 170)">$username</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">input</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'username'</span>,<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'自如初'</span>);</span>

query方法用于获取get参数

用法与input类似，只不过query方法用获取get请求参数。

第一步：定义路由 web.php

Route::get('test','DemoController@test');

第二步：定义方法 DemoController.php

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(119, 0, 136)">public</span> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">function</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">test</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 0)">Request</span> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span>)</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">{</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 获取单个参数</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">query</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'name'</span>));</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 指定默认值</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">query</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'name'</span>,<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'自如初'</span>));</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 获取所有get参数   </span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(0, 0, 0)">dd</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">query</span>());</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">}</span>

第三步：访问

你的域名/test??name=lisi&age=17

获取post请求的所有值

如果是post请求，那么all方法可以换成post方法。

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">post</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'username'</span>));</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dd</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">post</span>());</span>

query与input的区别

打印$request实例，会发现它有request与query属性：

input方法会从query+request属性中获取请求参数的值；post方法是从request属性对象中获取post请求参数值。

简单地说，input获取所有请求参数；query获取get请求参数。

通过动态属性获取值

dd($request->username);

获取部分值

使用only与except获取部分值。only获取指定要接收的字段值；except排除不需要接收的字段值。

改造index.blade.php界面

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(152, 26, 26)"><</span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">form</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">action</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"{{ route('store') }}"</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">method</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"post"</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">   <span style="box-sizing: border-box;color: rgb(0, 0, 0)">用户名：</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)"><</span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">input</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">type</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"text"</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">name</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"username"</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">   <span style="box-sizing: border-box;color: rgb(0, 0, 0)">昵称</span>:<span style="box-sizing: border-box;color: rgb(152, 26, 26)"><</span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">input</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">type</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"text"</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">name</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"nickname"</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">邮箱</span>:<span style="box-sizing: border-box;color: rgb(152, 26, 26)"><</span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">input</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">type</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"text"</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">name</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"email"</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(152, 26, 26)"><</span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">input</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">type</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"submit"</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">value</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(170, 17, 17)">"提交"</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(152, 26, 26)"></</span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">form</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">></span></span>

获取指定的值

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// DemoController.php中的store方法</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 只接收这两个值</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">only</span>([<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'username'</span>,<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'email'</span>]));</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 不接收username,其他的都接收</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">except</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'username'</span>));</span>

获取JSON值

如需要发送JSON数据到后台，需要设置请求头Content-Type为application/json，然后可以通过input方法获取JSON数据。但是必须用.号解析数组。

$username = $request->input('user.username');

判断请求参数的其他实用方法

判断请求参数是否存在

has方法用于判断请求参数是否存在，存在返回 true

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// stroe方法中演示</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 接收单个值</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">has</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'username'</span>));</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">/*</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">*接收多个，只有都存在时返回true</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">*age不存在，因此返回了false</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">*/</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">has</span>([<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'username'</span>,<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'nickname'</span>,<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'age'</span>]));</span>

hasAny方法，只要有一个字段值存在就返回true

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// age字段不存在，其他两个存在，因此返回true</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">hasAny</span>([<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'username'</span>,<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'nickname'</span>,<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'age'</span>]));</span>

filled方法，请求参数必须存在且不能为空。

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 提交表单时，username不填写，返回FALSE，有值返回true</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">filled</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'username'</span>));</span>

missing方法，判断请求参数字段不存在

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// age字段值不存在，返回true</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">missing</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'age'</span>));</span>

获取请求路径与方法

假如要获取当前请求的URL路径该怎么办？$request实例中提供了相关的方法。

下面我们基于DemoController中的index方法来演示。

获取请求路径

path方法获取当前请求的路径信息，如http://demo.com/usr/1，则path方法返回/usr/1。

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// DemoController.php</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(119, 0, 136)">public</span> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">function</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">index</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 0)">Request</span> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span>)</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">{ </span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 返回 demo</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">path</span>());</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(119, 0, 136)">return</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">view</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'demo.index'</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">}</span>

获取请求的URL

获取完整的URL信息可以使用url方法或fullurl方法。url返回不带参数的url，fullurl返回包含参数的URL。

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 如请求:http://la8.com/demo?id=112</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// url()方法返回http://la8.com/demo</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">url</span>());</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// fullurl()方法返回 http://la8.com/demo?id=112</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">fullurl</span>());</span>

获取请求方法

method方法返回HTTP请求方式。isMethod方法验证HTTP请求。

本例演示将在store方法中进行。

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 获取当前请求方法</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 85, 170)">$method</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">method</span>();</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 判断是否为POST请求</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(119, 0, 136)">if</span> (<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">isMethod</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'POST'</span>)) {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">}</span>

请求数据缓存

有这样一个真实开发环境，比如登录页面填写用户名与密码，假如密码输错了，那么整个页面的信息需要填写，这是很不友好的。Laravel提供了这样一个机制，两次请求之间，可以获取上一次请求的值。若使用的是Laravel自带的验证机制，那么需要设置，可以直接在在视图中使用old()助手函数调用。如下案例

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)"><!--index.blade.php--></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">form</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">action</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"{{ route('store') }}"</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">method</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"post"</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    用户名：<span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">input</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">type</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"text"</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">name</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"username"</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">value</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"{{old('username')}}"</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">input</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">type</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"submit"</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">value</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"提交"</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">form</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span>

将数据存入session

$request->flash();

获取上一次请求数据

$request->old('username');

Cookie操作

由于Cookie是存储在浏览器端的，因此cookie必须依赖于某个请求和响应,session是存储在服务器端，因此session不需要依赖某个请求或响应头。

关于cookie的操作，直接在路由中进行演示。

定义路由：

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">Route</span>::<span style="box-sizing: border-box;color: rgb(0, 0, 0)">get</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'addcookie'</span>, <span style="box-sizing: border-box;color: rgb(119, 0, 136)">function</span>(){</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(119, 0, 136)">return</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">response</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'自如初博客'</span>)<span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">cookie</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'webName'</span>,<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'自如初'</span>,<span style="box-sizing: border-box;color: rgb(17, 102, 68)">60</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">});</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">Route</span>::<span style="box-sizing: border-box;color: rgb(0, 0, 0)">get</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'getcookie'</span>, <span style="box-sizing: border-box;color: rgb(119, 0, 136)">function</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 0)">\Illuminate\Http\Request</span> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span>){</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">cookie</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'webName'</span>));</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">});</span>

添加cookie到响应

用法：cooke(cookie键,cookie值,cookie有效时间);

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">Route</span>::<span style="box-sizing: border-box;color: rgb(0, 0, 0)">get</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'addcookie'</span>, <span style="box-sizing: border-box;color: rgb(119, 0, 136)">function</span>(){</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(119, 0, 136)">return</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">response</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'自如初博客'</span>)<span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">cookie</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'webName'</span>,<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'自如初'</span>,<span style="box-sizing: border-box;color: rgb(17, 102, 68)">60</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">});</span>

获取cookie

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(0, 0, 0)">Route</span>::<span style="box-sizing: border-box;color: rgb(0, 0, 0)">get</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'getcookie'</span>, <span style="box-sizing: border-box;color: rgb(119, 0, 136)">function</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 0)">\Illuminate\Http\Request</span> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span>){</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(0, 0, 0)">dump</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$request</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">cookie</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'webName'</span>));</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">});</span>

我是温新

每天进步一点点，就一点点