/***************************by
garcon1986********************************/
<?php
//简单示例
class SimpleClass
{
public $var = 'a default value';
public function displayVar(){
echo $this->var;
}
}
// create an object创建一个对象
$A = new SimpleClass;
//调用方法
$A -> displayVar();
echo '<p>';
//example2
class A{
function sjg(){
if(isset($this)){
echo '$this is defined.<br>\n';
echo get_class($this); //返回对象所属的类的名字
echo ")<br>";
}else {
echo "\$this is not defined.<br> \n";
}
}
}
class B{
function bar(){
A::sjg();
}
}
$a = new A();
$a -> sjg();
A::sjg();
$b = new B();
$b -> bar();
B::bar();
echo '<p>';
//example3
//创建一个实例
$instance = new SimpleClass();
//对象赋值
$assigned = $instance;
$reference =& $instance;
$instance->var = '$assigned will have this value';
$instance = null;
var_dump($instance);
echo "<br>";
var_dump($reference);
echo "<br>";
var_dump($assigned);
echo "<p>";
//example4
//继承
class ExtendClass extends SimpleClass{
//redefine the parent method
function displayVar(){
echo "Extending class\n";
parent::displayVar();
}
}
$extended = new ExtendClass();
$extended->displayVar();
echo '<p>';
//autoload自动加载
function __autoload($class_name){
require_once $class_name.'.php';
}
//$obj = new MyClass1();
//$obj = new MyClass2();
//constructors
class BaseClass{
function __construct(){
print "In BaseClass constructor!\n";
}
}
class SubClass extends BaseClass{
function __construct(){
parent::__construct();
print "in SubClass constructor\n";
}
}
$obj = new BaseClass();
echo '<br>';
$obj->__construct();
echo '<br>';
$obj = new SubClass();
echo '<br>';
$obj->__construct();
echo '<p>';
//destructors
class MyDestructableClass{
function __construct(){
print "In constr
