PHP魔术方法以及关于独立实例与相连实例的全面讲解

<div class="jb51code">
<pre class="brush:PHP;">
<?php
//魔术方法
//当包含多个类
//1.自动装载类的魔术方法autoload()
function autoload($classname){
if (isset($classname)){
require_once $classname.'.class.php';
}
}

/ $computer1=new Computer();
$computer1->addList('dalisng',234);
echo $computer1; /
//__call()屏蔽调用方法时候产生的错误，当我们调用一个不存在的方法时候，会自动调用__call（）方法。
//独立实例，两个实例各自建立，互不干涉
$computer2=new Computer();
echo $computer2->name;echo "
";
$computer3=new Computer();
echo $computer3->name;echo "
";
$computer3->name="大亮";
echo '$computer3->name:'.$computer3->name;echo "
";
echo '$computer2->name:'.$computer2->name;echo "
";

echo "

---

";
//相连实例，即 用等于号来开辟一个新的实例，此时两个实例共同指向一个内存地址，一损俱损，一荣俱荣
$computer4=new Computer();
echo '$computer4->name:'.$computer4->name;echo "
";
$computer5=$computer4;
echo '$computer5->name:'.$computer5->name;echo "
";
$computer4->name="大亮";
echo '$computer4->name:'.$computer4->name;echo "
";
echo '$computer5->name:'.$computer5->name;echo "
";

echo "

---

";
//克隆__clone,克隆的新实例和被克隆的实例是两个相互独立的个体，虽然属性值相同，但是属性存放的地址不同，所以克隆后你我生死无关
$computer6=new Computer();
echo '$computer6->name:'.$computer6->name;echo "
";
$computer7=clone $computer6;
echo '$computer7->name:'.$computer7->name;echo "
";
$computer6->name="克隆";
echo '$computer6->name:'.$computer6->name;echo "
";
echo '$computer7->name:'.$computer7->name;echo "
";