Introduction to PHP 8 Object Oriented 2 Abstract Class

1. Abstract classes must be inherited to be used and cannot be directly new

2. Abstract classes can have non-abstract methods

3. Subclasses must implement all abstract methods

4. Similar to JAVA’s abstract classes

(Click to go to)JAVA's abstract class

<code><span><span><?php</span><span>//抽象类关键字 abstract  抽象类不能实例化 必须被继承才能使用</span><span>abstract</span><span><span>class</span><span>_parent</span>{</span><span>//抽象方法关键字 abstract</span><span>public</span><span>abstract</span><span><span>function</span><span>fun1</span><span>()</span>;</span><span>//抽象类中可以用非抽象方法</span><span>public</span><span><span>function</span><span>parentfunc</span><span>()</span> {</span><span>echo</span><span>"Hello<br>"</span>;
        }
    }

    <span><span>class</span><span>Test</span><span>extends</span><span>_parent</span>{</span><span>//必须实现抽象类的所有抽象方法</span><span>public</span><span><span>function</span><span>fun1</span><span>()</span>{</span><span>echo</span><span>"class Test<br>"</span>;
        }
    }


    <span>$A</span> = <span>new</span>  Test();
    <span>$A</span>->fun1();
    <span>$A</span>->parentfunc();
<span>?></span></span></code>

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