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<!DOCTYPE html> <html> <body> <?php // 父类 abstract class Car { public $name; public function __construct($name) { $this->name = $name; } abstract public function intro() : string; } // 子类 class Audi extends Car { public function intro() : string { return "选择德国品质！我是一辆 $this->name！"; } } class Volvo extends Car { public function intro() : string { return "以中国为荣！我是一辆 $this->name！"; } } class Citroen extends Car { public function intro() : string { return "法国奢华！我是一辆 $this->name！"; } } // 从子类创建对象 $audi = new audi("奥迪"); echo $audi->intro(); echo "<br>"; $volvo = new volvo("比亚迪"); echo $volvo->intro(); echo "<br>"; $citroen = new citroen("雪铁龙"); echo $citroen->intro(); ?> </body> </html>