实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<?php
class demo01{
public $num;
public $price;
public function __construct($num,$price){
$this->num = $num;
$this->price = $price;
}
public function getMoney(){
return '总共费用：'. $this->num*$this->price.'元';
}
}
//实现子类继承
class demo02 extends demo01{
public $name = '苹果';
}
$obj = new demo02(4,20);
echo $obj->name.'的'.$obj -> getMoney();
?>
</body>
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