作者：温新

时间：2021-07-01

hi，我是温新，一名PHPer

对于某个状态（如 启用与关闭），我们经常会用数字来标识。那么在前端页面显示时，会进行转化，如1=启用，2=关闭。Laravel提供了相关方法供我们使用，后台转换，前台直接使用。

访问器

定义：get字段名Attribute，使用驼峰法命令。

如：getTitleAttribute，其中Title就是需要访问的字段名。

第一步：定义访问器

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// app/Models/Post.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(170, 85, 0)">// 当调用title时，该值转为大写</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)">getTitleAttribute</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$value</span>)</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">{</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(119, 0, 136)">return</span> <span style="box-sizing: border-box;color: rgb(51, 0, 170)">strtoupper</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$value</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">}</span>

第二步：控制器获取数据

<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)">demo</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, 85, 170)">$posts</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">Post</span>::<span style="box-sizing: border-box;color: rgb(0, 0, 0)">findOrFail</span>(<span style="box-sizing: border-box;color: rgb(17, 102, 68)">80</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 页面会输出大写的值</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(0, 0, 0)">dd</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$posts</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">title</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.demo'</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">}</span>

举一反三：有一字段 sex，1男 2女，该如何转换呢？

修改器

定义：set字段名Attribute，当为模型上对应的字段赋值值，该修改器自动调用。

第一步：定义修改器

<span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box;color: rgb(170, 85, 0)">// app/Models/Post.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)">setTitleAttribute</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">$value</span>)</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">{</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$this</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">attributes</span>[<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'title'</span>] <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$value</span> . <span style="box-sizing: border-box;color: rgb(170, 17, 17)">'ziruchu'</span>;</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">}</span>

第二步：控制器修改数据

<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(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)">demo</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, 85, 170)">$post</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">Post</span>::<span style="box-sizing: border-box;color: rgb(0, 0, 0)">find</span>(<span style="box-sizing: border-box;color: rgb(17, 102, 68)">80</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">    <span style="box-sizing: border-box;color: rgb(0, 85, 170)">$post</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">title</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(170, 17, 17)">'Laravel系列笔记'</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)">$post</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">-></span><span style="box-sizing: border-box;color: rgb(0, 0, 0)">save</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.demo'</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