ThinkPHP container uses design patterns and reflection to implement a simple case

This article will use two design patterns and reflection knowledge to implement a simple case, and simply integrate and connect the previously learned knowledge points.

5. Integrating design patterns and reflection to implement a case

Experienced ninety-nine and eighty-one years The difficulty finally comes to the container. In this link, we first implement a container of our own and connect the singleton mode, registration tree mode, and reflection explained before in series, so as to deepen our impression and better understand it.

I still remember that I mentioned such a method in dependency injection before dependency. This method is to perform dependency injection to decouple the code.

But this time! Containers will be used to solve this problem.

First define the required classes. This class uses singleton mode and registration tree mode. The previous articles are not very good, so be sure to read them carefully, otherwise it will be difficult to understand the following articles. of.

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<span style="display: block; background: url(https://my-wechat.mdnice.com/point.png); height: 30px; width: 100%; background-size: 40px; background-repeat: no-repeat; background-color: #282c34; margin-bottom: -7px; border-radius: 5px; background-position: 10px 10px;"></span><code class="hljs" style="overflow-x: auto; padding: 16px; color: #abb2bf; display: -webkit-box; font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; font-size: 12px; -webkit-overflow-scrolling: touch; padding-top: 15px; background: #282c34; border-radius: 5px;"><span class="hljs-meta" style="color: #61aeee; line-height: 26px;"><?php</span><br/><span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">/**<br/> * Created by PhpStorm.<br/> * User: 咔咔<br/> * Date: 2020/9/21<br/> * Time: 19:04<br/> */</span><br/><br/><span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">namespace</span> <span class="hljs-title" style="color: #61aeee; line-height: 26px;">container</span>;<br/><br/><br/><span class="hljs-class" style="line-height: 26px;"><span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">class</span> <span class="hljs-title" style="color: #e6c07b; line-height: 26px;">Container</span><br/></span>{<br/>    <span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">/**<br/>     * 存放容器<br/>     * <span class="hljs-doctag" style="color: #c678dd; line-height: 26px;">@var</span> array<br/>     */</span><br/>    <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">public</span> $instances = [];<br/><br/>    <span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">/**<br/>     * 容器的对象实例<br/>     * <span class="hljs-doctag" style="color: #c678dd; line-height: 26px;">@var</span> array<br/>     */</span><br/>    <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">protected</span> <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">static</span> $instance;<br/><br/>    <span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">/**<br/>     * 定义一个私有的构造函数防止外部类实例化<br/>     * Container constructor.<br/>     */</span><br/>    <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">private</span> <span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">function</span> <span class="hljs-title" style="color: #61aeee; line-height: 26px;">__construct</span><span class="hljs-params" style="line-height: 26px;">()</span> </span>{<br/><br/>    }<br/><br/>    <span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">/**<br/>     * 获取当前容器的实例(单例模式)<br/>     * <span class="hljs-doctag" style="color: #c678dd; line-height: 26px;">@return</span> array|Container<br/>     */</span><br/>    <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">public</span> <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">static</span> <span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">function</span> <span class="hljs-title" style="color: #61aeee; line-height: 26px;">getInstance</span> <span class="hljs-params" style="line-height: 26px;">()</span><br/>    </span>{<br/>        <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">if</span>(is_null(<span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">self</span>::$instance)){<br/>            <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">self</span>::$instance = <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">new</span> <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">self</span>();<br/>        }<br/><br/>        <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">return</span> <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">self</span>::$instance;<br/>    }<br/><br/>    <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">public</span> <span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">function</span> <span class="hljs-title" style="color: #61aeee; line-height: 26px;">set</span> <span class="hljs-params" style="line-height: 26px;">($key,$value)</span><br/>    </span>{<br/>        <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">return</span> <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">$this</span>->instances[$key] = $value;<br/>    }<br/><br/>    <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">public</span> <span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">function</span> <span class="hljs-title" style="color: #61aeee; line-height: 26px;">get</span> <span class="hljs-params" style="line-height: 26px;">($key)</span><br/>    </span>{<br/>        <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">return</span> <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">$this</span>->instances[$key];<br/>    }<br/>}<br/></code>

For the convenience of future viewing, here are the case demonstrations of each section Place it in the corresponding controller

Here transplant the previous dependency injection code and configure annotation routing for access to see if the final result is 123 returned by the Car method

Test the printing result, everything is ok

This code was modified using singleton mode and registration tree mode

After modification, the result is printed, which is also returned by car Value 123.

It should be noted here that the set and get methods will not coexist in the same method. They are written together just to give you a demonstration.

When you look at the source code of the container later, you will know how to use the set and get methods. Here we just let you experience the singleton mode and the registration tree mode.

Make a small modification here, modify the last two lines of code above

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Keep learning and persist Writing blogs and insisting on sharing are the beliefs that Kaka has always adhered to since its beginning. I hope that Kaka’s articles on the huge Internet can bring you a little bit of help. I’m Kaka, see you next time.

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