PHP 实现 IOC set 流入

PHP 实现 IOC set 注入

本文采用类似java中annotation的形式实现set注入
首先DI容器代码

<code class="language-php hljs "><span class="hljs-keyword">require</span> <span class="hljs-string">'DocParser.php'</span>;<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Container</span>{</span>    <span class="hljs-comment">/**     * 利用容器来实例化对象，外部调用接口     [email&#160;protected] $name 为类名 eg. 'User'     */</span>    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">get</span><span class="hljs-params">(<span class="hljs-variable">$name</span>)</span>    {</span>        <span class="hljs-keyword">static</span> <span class="hljs-variable">$cache</span> = <span class="hljs-keyword">array</span>();        <span class="hljs-keyword">if</span>(<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$cache</span>[<span class="hljs-variable">$name</span>]))        {            <span class="hljs-keyword">return</span> <span class="hljs-variable">$cache</span>[<span class="hljs-variable">$name</span>];        }        <span class="hljs-keyword">require</span> <span class="hljs-string">'models/'</span> . ucfirst(<span class="hljs-variable">$name</span>) . <span class="hljs-string">'.php'</span>;        <span class="hljs-variable">$reflection</span> = <span class="hljs-keyword">new</span> ReflectionClass(<span class="hljs-variable">$name</span>);        <span class="hljs-variable">$depends</span> = <span class="hljs-variable">$this</span>->getDependency(<span class="hljs-variable">$reflection</span>);        <span class="hljs-variable">$cache</span>[<span class="hljs-variable">$name</span>] = <span class="hljs-variable">$this</span>->createObject(<span class="hljs-variable">$reflection</span>, <span class="hljs-variable">$depends</span>);        <span class="hljs-keyword">return</span> <span class="hljs-variable">$cache</span>[<span class="hljs-variable">$name</span>];    }    <span class="hljs-comment">/**     * 利用反射获取类需要的依赖条件，[email&#160;protected] 注解的public 变量     *<span class="hljs-phpdoc"> @param</span> $reflection ReflectionClass     */</span>    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getDependency</span><span class="hljs-params">(<span class="hljs-variable">$reflection</span>)</span>    {</span>        <span class="hljs-variable">$depends</span> = <span class="hljs-keyword">array</span>();        <span class="hljs-variable">$props</span> = <span class="hljs-variable">$reflection</span>->getProperties(ReflectionProperty::IS_PUBLIC);        <span class="hljs-keyword">foreach</span> (<span class="hljs-variable">$props</span> <span class="hljs-keyword">as</span> <span class="hljs-variable">$prop</span>) {            <span class="hljs-variable">$str</span> = <span class="hljs-variable">$prop</span>->getDocComment();            <span class="hljs-variable">$parser</span> = <span class="hljs-keyword">new</span> DocParser();            <span class="hljs-variable">$anotations</span> = <span class="hljs-variable">$parser</span>->parse(<span class="hljs-variable">$str</span>);            <span class="hljs-keyword">if</span>(<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$anotations</span>[<span class="hljs-string">'inject'</span>]))            {                <span class="hljs-variable">$depends</span>[<span class="hljs-variable">$prop</span>->getName()] = <span class="hljs-variable">$anotations</span>[<span class="hljs-string">'inject'</span>];            }        }        <span class="hljs-keyword">return</span> <span class="hljs-variable">$depends</span>;    }    <span class="hljs-comment">/**     * 实例化对象的方法     *<span class="hljs-phpdoc"> @param</span> $instance ReflectionClass     *<span class="hljs-phpdoc"> @param</span> $depends array( 'field' => 'Class' ),  field 为注入的变量名，class为注入的类     */</span>    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">createObject</span><span class="hljs-params">(<span class="hljs-variable">$instance</span>, <span class="hljs-variable">$depends</span>)</span>    {</span>        <span class="hljs-variable">$instance</span> = <span class="hljs-variable">$instance</span>->newInstanceArgs(<span class="hljs-keyword">array</span>());        <span class="hljs-keyword">foreach</span> (<span class="hljs-variable">$depends</span> <span class="hljs-keyword">as</span> <span class="hljs-variable">$key</span> => <span class="hljs-variable">$value</span>)        {            <span class="hljs-variable">$instance</span>->{<span class="hljs-variable">$key</span>} = <span class="hljs-variable">$this</span>->get(<span class="hljs-variable">$value</span>);        }        <span class="hljs-keyword">return</span> <span class="hljs-variable">$instance</span>;    }}</code>

其中 DocParser.php 为解析php注释的工具类。

• 使用方法篇
  在同级目录下新建models文件夹,新建User.php

<code class="language-php hljs "><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">User</span>{</span>    <span class="hljs-comment">/**     * 使用inject注解来标明该变量需要注入,后面跟着需要注入的类名     *<span class="hljs-phpdoc"> @inject</span> Email     */</span>    <span class="hljs-keyword">public</span> <span class="hljs-variable">$email</span>;    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">sendEmail</span><span class="hljs-params">()</span>    {</span>        <span class="hljs-variable">$this</span>->email->sendEmail();    }}</code>

新建Email.php

<code class="language-php hljs "><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Email</span>{</span>    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">sendEmail</span><span class="hljs-params">()</span>    {</span>        <span class="hljs-keyword">echo</span> <span class="hljs-string">'send email!'</span>;    }}</code>

在根目录下新建index.php

<code class="language-php hljs "><span class="hljs-keyword">require</span> <span class="hljs-string">'Container.php'</span>;<span class="hljs-variable">$di</span> = <span class="hljs-keyword">new</span> Container();<span class="hljs-variable">$user</span> = <span class="hljs-variable">$di</span>->get(<span class="hljs-string">'User'</span>);<span class="hljs-variable">$user</span>->sendEmail();</code>

运行一下index.php就能看到结果了。
本文只是演示IOC的实现过程，没有考虑实际使用场景。

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