50 lines
1.5 KiB
Markdown
50 lines
1.5 KiB
Markdown
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---
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title: Classes and Objects
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localeTitle: 类和对象
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---
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# 类和对象
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类是我们表示世界中对象类型的方式。对象将是世界上该类的实际_实例_ 。类定义该类的对象的_属性_和_行为_ 。该类定义了对象如何与世界其他地方进行交互。类还允许我们抽象出我们不想向其他人展示的细节！
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比如说你有一只叫做Spot的狗。 Spot是Dog（类）对象的一个实例。
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用于定义类的PHP代码：
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```php
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// Dog class
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class dog {
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// Keep name and age private - we don't want to be able to change these!
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private $name;
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private $age;
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// Constructor allows us to make an object of this class with given parameters.
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function __construct($name, $age){
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$this->name = $name;
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$this->age = $age;
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echo 'Dog named: '.$this->name.' is '.$this->age.' years old.';
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}
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// Destructor gets called when the item is deleted.
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function __destruct(){
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echo 'Dog '.$this->name.' has ran off into the sunset';
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}
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function getname() {
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echo $this->name;
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}
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function getage() {
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echo $this->age;
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}
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}
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$mydog = new dog("Spot", "8");
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echo $mydog->getname();
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echo $mydog->getage();
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```
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上面的代码将回应： 狗命名：现货是8岁。 点 8 狗斑已经跑到夕阳下
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我创建了一个对象$ mydog的类狗。它的构造函数被调用，我在类中使用了一些方法，然后调用了析构函数。
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