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PHP object-oriented programming example study notes
- WBOYOriginal
- 2016-08-08 09:27:05966browse
1. __get() and __set() methods
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<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<?php
// put your code here
class animal{
private $name;
private $color;
private $age;
public function __get($property_name) {
echo "在直接获取私有属性值的时候，自动调用了这个__get()方法<br>";
if(isset($this->$property_name)){
return $this->$property_name;
}
else
{
return NULL;
}
}
public function __set($propertyname, $value) {
echo "在直接设置私有属性值的时候，自动调用了这个__set()方法为私有属性赋值<br>";
$this->$propertyname = $value;
}
}
$pig = new animal();
$pig->name = "猪";
$pig->color = "白色";
$pig->age = "1岁";
echo "称呼：".$pig->name."<br>";
echo "颜色：".$pig->color."<br>";
echo "年龄：".$pig->age."<br>";
?>
</body>
</html>
2. __call() method
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<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<?php
// put your code here
class Test{
function __call($function_name, $args) {
print "你所调用的函数：$function_name(参数：";
print_r($args);
print ")不存在！<br>\n";
}
}
$test = new Test();
$test->demo("one", "two", "three");
echo "this is a test<br>";
?>
</body>
</html>
3. clone object
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<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<?php
// put your code here
class animal{
//下面是动物的成员属性
public $name = '';//成员属性name
public $color = ''; //成员属性color
public $age = ''; //成员属性size
//定义一个构造方法， 参数为$name、$color和$age
function __construct($name, $color, $age) {
//通过构造方法传进来的$name 给成员属性$this->name赋初值
$this->name = $name;
//通过构造方法传进来的$color 给成员属性$this->color赋初值
$this->color = $color;
//通过构造方法传进来的$age 给成员属性$this->age赋初值
$this->age = $age;
}
function getInfo(){
echo '动物的名字叫做'.$this->name.'，动物的颜色是'.$this->color.'，动物的年龄是'.$this->age.'.';
}
}
$pig = new animal("猪", "白色", "1岁");
//使用clone克隆新对象pig2,和$pig对象具有相同的属性和方法
$pig2 = clone $pig;
$pig2->getInfo();
?>
</body>
</html>
4. __clone() method
<!DOCTYPE html>
<!--
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To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<?php
// put your code here
class animal{
//下面是动物的成员属性
public $name = '';//成员属性name
public $color = ''; //成员属性color
public $age = ''; //成员属性size
//定义一个构造方法， 参数为$name、$color和$age
function __construct($name, $color, $age) {
//通过构造方法传进来的$name 给成员属性$this->name赋初值
$this->name = $name;
//通过构造方法传进来的$color 给成员属性$this->color赋初值
$this->color = $color;
//通过构造方法传进来的$age 给成员属性$this->age赋初值
$this->age = $age;
}
function getInfo(){
echo '动物的名字叫做'.$this->name.'，动物的颜色是'.$this->color.'，动物的年龄是'.$this->age.'.';
}
function __clone() {
//$this指的复本pig2，而$that是指向原本pig,这样就在本方法中改变了复本的属性;
$this->name = "假的$this->name";
$this->age = '2岁';
}
}
$pig = new animal("猪", "白色", "1岁");
//使用clone克隆新对象pig2,和$pig对象具有相同的属性和方法
$pig2 = clone $pig;
$pig->getInfo();
$pig2->getInfo();
?>
</body>
</html>
5. __toString() method
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<html>
<head>
<meta charset="UTF-8">
<title></title>
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<body>
<?php
// put your code here
//Declare a simple class
class TestClass{
public $foo;
public function __construct($foo) {
$this->foo = $foo;
}
public function __toString() {
return $this->foo;
}
}
$class = new TestClass('HelloWorld');
echo $class;
?>
</body>
</html>
6. const keyword
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<body>
<?php
// put your code here
class MyClass{
const constant = 'constant value';
function showConstant(){
echo self::constant."\n";
}
}
echo MyClass::constant."\n";
$class = new MyClass();
$class->showConstant();
?>
</body>
</html>
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