设计模式:模板方法模式

<?php
    abstract class  Template{
        protected abstract function title();
        protected abstract function body();

        public function show(){
            echo "标题:" . $this->title() . PHP_EOL;
            echo "内容:" . $this->body() . PHP_EOL;
        }
    }

    class php_language extends Template {
        protected function title(){
            return "我是PHP";
        }
        protected function body(){
            return "PHP是世界上最好的语言";
        }
    }
    
    class html_language extends Template {
        protected function title(){
            return "我是html";
        }
        protected function body(){
            return "html/css/js 网页三剑客";
        }
    }