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<meta charset="utf-8">
<?php
//类的声明与实例化
class demo1
{
}
//可以添加属性和方法
$demo1 = new Demo1();
$demo1->name = '胡老师';
$demo1->sex = '男';
$demo1->hello = function (){
return '自定义方法';
};
echo $demo1->name,':',$demo1->sex,'<br>';
echo '<hr>';
echo call_user_func($demo1->hello);
//对象的封装、继承、多态
class Demo2
{
public $name;
public $salary = 5000;
protected $sex = 1;
private $age = 33;
public function getSex()
{
return ($this->sex ==0) ? '男' : '女';
}
public function getAge()
{
return ($this->sex ==0) ?$this->age : '保密';
}
}
$demo2 = new Demo2;
echo $demo2->salary,'<hr>';
echo $demo2->getSex();
echo $demo2->getAge();<meta charset="UTF-8">
<?php
//类常量初始化，属性重载
class Demo3
{
const SITE_NAME = 'php中文网';
// 声明三个私用属性
private $name ;
private $course ;
private $grade ;
public function __construct($name,$course,$grade)
{
$this->name = $name;
$this->course = $course;
$this->grade = $grade;
}
public function show()
{
return $this->name. '的' .$this->course. '课程成绩：' .$this->grade. '分!';
}
public function __get($name)
{
if($name == 'grade'){
return $name. '不许查看';
}
}
public function __set($name,$value)
{
if ($name == 'grade') {
return $name . '不许';
}
$this->$name = $value;
}
}
echo Demo3::SITE_NAME;
echo '<hr>';
$demo3 = new Demo3('pig','php','90');
var_dump($demo3);
echo '<hr>';
echo $demo3->show();
echo $demo3->name;
echo $demo3->grade;
echo '<hr>';
$demo3->course = 'css';
echo '课程是：',$demo3->course;点击 "运行实例" 按钮查看在线实例
点击 "运行实例" 按钮查看在线实例
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