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<!DOCTYPE html> <html> <body> <?php // Parent class abstract class Car { public $name; public function __construct($name) { $this->name = $name; } abstract public function intro() : string; } // Child classes class Audi extends Car { public function intro() : string { return "Choose German quality! I'm an $this->name!"; } } class Volvo extends Car { public function intro() : string { return "Proud to be Swedish! I'm a $this->name!"; } } class Citroen extends Car { public function intro() : string { return "French extravagance! I'm a $this->name!"; } } // Create objects from the child classes $audi = new audi("Audi"); echo $audi->intro(); echo "<br>"; $volvo = new volvo("Volvo"); echo $volvo->intro(); echo "<br>"; $citroen = new citroen("Citroen"); echo $citroen->intro(); ?> </body> </html>
选择德国品质！我是奥迪！
瑞典骄傲！我是沃尔沃！
法式奢华！我是雪铁龙！
