ThinkPHP plays with its own container class-ThinkPHP-php.cn

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This article will implement a simple container class
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five , Play with your own container class

At this time we modify the Person file

Add a constructor and assign the parameters using the constructor. In the buy method, there is no need to pass parameters, just use this->obj.

ThinkPHP plays with its own container class If you still run the dependency route directly at this time, the following error will be reported. That is because the constructor in Person has a parameter, but we did not pass it.

ThinkPHP plays with its own container class At this point, you need to modify one thing, which is to pass the Car instance as a parameter when instantiating the Person. There will be no problem.

But you will find out what code is above. What was originally a simple few lines of code has become complicated like this. , this time has already done more harm than good. No matter how good the design pattern is, blind use is also a burden to the project.

So this is when reflection comes. Reflection is briefly introduced above, so be sure to read it! The articles are all linked together.

Reflection Battle Optimization Code

The final optimized code is like this. Next, we will briefly analyze this code.

Based on the previous code, only the get method in kaka/container/Container.php was modified
Determine whether the named person is in the container
Use the reflection interface, and then get the constructor of the person class passed in
If person is not The constructor method can directly return the instance of person
If person is stored in the constructor, get the method of person constructor
Because person The parameters of the constructor in the class are not limited to one
, so you need to loop to get the object of each parameter
Finally use reflection The newInstanceArgs interface creates the corresponding instance

<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-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">/**<br/>     * User : 咔咔<br/>     * Notes: 获取容器里边的实例  使用反射<br/>     * Time :2020/9/21 22:04<br/>     * <span class="hljs-doctag" style="color: #c678dd; line-height: 26px;">@param</span> $key<br/>     * <span class="hljs-doctag" style="color: #c678dd; line-height: 26px;">@return</span> mixed<br/>     */</span><br/>    <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">public</span> <span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">function</span> <span class="hljs-title" style="color: #61aeee; line-height: 26px;">get</span> <span class="hljs-params" style="line-height: 26px;">($key)</span><br/>    </span>{<br/>        <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">if</span>(!<span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">empty</span>(<span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">$this</span>->instances[$key])){<br/>            $key = <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">$this</span>->instances[$key];<br/>        }<br/><br/>        $reflect = <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">new</span> \ReflectionClass($key);<br/>        <span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">// 获取类的构造函数</span><br/>        $c = $reflect->getConstructor();<br/>        <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">if</span>(!$c){<br/>            <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">return</span> <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">new</span> $key;<br/>        }<br/><br/>        <span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">// 获取构造函数的参数</span><br/>        $params = $c->getParameters();<br/>        <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">foreach</span> ($params <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">as</span> $param) {<br/>       <span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">/**<br/>             ReflectionClass Object<br/>            (<br/>                [name] => container\dependency\Car<br/>            )<br/>             */</span><br/>            $class = $param->getClass();<br/>            <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">if</span>(!$class){<br/><br/>            }<span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">else</span>{<br/>                <span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">// container\dependency\Car</span><br/>                $args[] = <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">$this</span>->get($class->name);<br/>            }<br/>        }<br/>        <span class="hljs-comment" style="color: #5c6370; font-style: italic; line-height: 26px;">// 从给出的参数创建一个新的类实例</span><br/>        <span class="hljs-keyword" style="color: #c678dd; line-height: 26px;">return</span> $reflect->newInstanceArgs($args);<br/>    }<br/>}<br/></code>

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ThinkPHP plays with its own container class Fileapplication/index/controller/Container.phpHere are the changes after the modification

ThinkPHP plays with its own container class Question 1: kaka/container/dependency/Person.phpWhat does the parameter Car inside mean?

This question is actually very simple, you can see This Car is the Car.php file in the same directory. You can directly understand it as files under the same namespace.

ThinkPHP plays with its own container class Question 2: Fileapplication/index/controller/Container.phpWhy can you call the buy method directly

First look at the value of obj, The Car class has already been instantiated in the returned object, so there is no need to instantiate it. You can call the buy method directly because the parameters will be passed directly.

ThinkPHP plays with its own container class The above is a simple container implemented by Kaka. If you don’t understand or have any questions, you can reply directly in the comment area.

The next step is to analyze the containers in the framework and trace them back to the root cause step by step.

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