最新下载
热门教程
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
References and Aliases are Different Mechanisms (z
时间：2022-07-02 10:30:22 编辑：袖梨 来源：一聚教程网
References and Aliases are Different Mechanisms
Author: zkarakaya
Date 14/03/2001
Aliasing and Referencing are completely different mechanisms in PHP.
If you are Java or C++ programmer, you must be careful when using
Objects created on run-time.
What value be the output of this program code. Many programmer will
say "20", but this is not correct. Output is 10. Why? Because we have
created an instance of MyClass type on the right hand side of assignment
operator, and gave an initial value of 10. In the constructor of MyClass,
we have send the memory location of that newly created instance to another
Author: zkarakaya
Date 14/03/2001
Aliasing and Referencing are completely different mechanisms in PHP.
If you are Java or C++ programmer, you must be careful when using
Objects created on run-time.
Lets see an example;
class MyClass{
var $myData;
var $outManager;
cfunction MyClass($p){
$this->myData=$p;
$this->outManager = new MyOutManager($this);
}
cfunction display(){
$this->outManager->display();
}
}
class MyOutManager{
var $refObj;
cfunction MyOutManager(&$obj){
$this->refObj = &$obj;
}
cfunction display(){
echo $this->refObj->myData;
}
}
$myvar = new MyClass(10);
$myvar->myData = 20;
$myvar->display();
?>
What value be the output of this program code. Many programmer will
say "20", but this is not correct. Output is 10. Why? Because we have
created an instance of MyClass type on the right hand side of assignment
operator, and gave an initial value of 10. In the constructor of MyClass,
we have send the memory location of that newly created instance to another
相关文章
- 王者荣耀侦探能力大测试攻略 王者荣耀侦探能力大测试怎么过 11-22
- 无期迷途主线前瞻兑换码是什么 11-22
- 原神欧洛伦怎么培养 11-22
- 炉石传说网易云音乐联动怎么玩 11-22
- 永劫无间手游确幸转盘怎么样 11-22
- 无期迷途主线前瞻兑换码是什么 无期迷途主线前瞻直播兑换码介绍 11-22