How to load another class file in php

#How does a php class file load another class file method?

There are a.php and b.php under the current file. I want to introduce class a into class b

<?php
    class a
    {
        public $name = &#39;zhouqi&#39;;
        public function say()
        {
            echo &#39;hello &#39;.$this->name;
        }
    }

<?php
    class b
    {
        //require(&#39;a.php&#39;); 错误，类中不能直接包含文件，但是可以在类定义的外部或类的方法中包含文件
        //$c = new a();      错误,类中不能直接实例化另外一个类，应该在类中的方法中实例化另一个类
        public function usea(){
            //包含a.php和实例化class a
            require (&#39;a.php&#39;);
            $person= new a();
            $person->name = &#39;erbao&#39;;
            $person->say();
        }
    }
    $person3 = new b();
    $person3->usea();

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