这个该怎么写,php关于类的继承的

 

这样?

<meta charset="utf-8">
<?php 

class Auto{
	public $color="";
	public $tires=4;
	function __construct( $color, $tires ) {
        $this->color = $color;
        $this->tires = $tires;
    }
    
    function __tostring(){
        return  "颜色:".$this->color."<br/>轮胎数量:".$this->tires;   
    }
}
class Bus extends Auto{
    public $ride;
    
	function __construct( $color, $tires,$ride ) {
        $this->color = $color;
        $this->tires = $tires;
        $this->ride=$ride;
    }
    function __tostring(){
        return  "颜色:".$this->color."<br/>轮胎数量:".$this->tires."<br/>共载人数:".$this->ride;   
    }
}

$a=new Auto("红色","4");
echo $a;
echo "<hr>";
$b=new Bus("白色",8,40);
echo $b;
?>

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