PHP编程中的__clone()方法使用详解
(编辑：jimmy 日期: 2025/11/10 浏览：3 次 )
可以在对象类中定义一个__clone()方法来调整对象的克隆行为。此方法的代码将在克隆操作期间执行。除了将所有现有对象成员复制到目标对象之外，还会执行__clone()方法指定的操作。下面修改Corporate_Drone类，增加以下方法：
function __clone() {
$this->tiecolor = "blue";
}
之后，创建一个新的Corporate_Drone对象，增加employeeid成员的值，克隆这个对象，然后输出一些数据，从而显示克隆对象的tiecolor确实是通过__clone()方法设置的。示例代码：
<"12345");
// Clone the $drone1 object
$drone2 = clone $drone1;
// Set the $drone2 employeeid member
$drone2->setEmployeeID("67890");
// Output the $drone1 and $drone2 employeeid members
echo "drone1 employeeID: ".$drone1->getEmployeeID()."<br />";
echo "drone2 employeeID: ".$drone2->getEmployeeID()."<br />";
echo "drone2 tiecolor: ".$drone2->getTiecolor()."<br />";
"htmlcode">
drone1 employeeID: 12345
drone2 employeeID: 67890
drone2 tiecolor:
再来一个小例子：
<"水果";
private $color = "颜色";
public function setName($name){
$this->name = $name;
}
public function setColor($color){
$this->color = $color;
}
function showColor(){
return $this->color.'的'.$this->name."<br />";
}
function __destruct(){
echo "被吃掉了（对象被回收） <br />";
}
}
$apple = new Fruit();
$apple->setName("大苹果");
$apple->setColor("红色");
echo $apple->showColor();
$clone_apple = $apple;
$clone_apple->setName("小苹果");
$clone_apple->setColor("青色");
echo $clone_apple->showColor();
"htmlcode">
<"水果";
private $color = "颜色";
public function setName($name){
$this->name = $name;
}
public function setColor($color){
$this->color = $color;
}
function showColor(){
return $this->color.'的'.$this->name."<br />";
}
function __destruct(){
echo "被吃掉了（对象被回收） <br />";
}
function __clone(){
$this->name = "克隆水果";
}
}
$apple = new Fruit();
$apple->setName("大苹果");
$apple->setColor("红色");
echo $apple->showColor();
$clone_apple = clone $apple;
$clone_apple->setColor("青色");
echo $clone_apple->showColor();
"htmlcode">
<"peter", 15, new Account(1000));
$person->setId(1);
$person2 = clone $person;
$person2->account->balance = 250;
var_dump($person, $person2);
"codetitle">复制代码 代码如下:
object(Person)#1 (4) { ["id":"Person":private]=> int(1) ["name":"Person":private]=> string(5) "peter" ["age":"Person":private]=> int(15) ["account"]=> object(Account)#2 (1) { ["balance"]=> int(1000) } } object(Person)#3 (4) { ["id":"Person":private]=> int(0) ["name":"Person":private]=> string(5) "peter" ["age":"Person":private]=> int(15) ["account"]=> object(Account)#4 (1) { ["balance"]=> int(250) } }
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