PHP魔术方法__clone()
2018-09-18 15:00 By
"Powerless"
3298
0
1
PHP中可以使用clone关键字来复制对象
示例代码如下：
$copy_of_object = clone $object;
但是，clone关键字只会进行浅复制，所有引用的属性依然会指向原来的变量。
如果对象里定义了__clone()方法，那么复制时就会调用__clone()方法，从而允许我们修改被复制的值（如果需要的话）。
示例代码如下：
<?php
class Person
{
public $sex;
public $name;
public $age;
public function __construct($name="", $age=25, $sex='Male')
{
$this->name = $name;
$this->age = $age;
$this->sex = $sex;
}
public function __clone()
{
echo __METHOD__."your are cloning the object.<br>";
}
}
$person = new Person('John'); // 赋初始值
$person2 = clone $person;
var_dump('persion1:');
var_dump($person);
echo '<br>';
var_dump('persion2:');
var_dump($person2);
输出结果如下：
Person::__clone your are cloning the object.
string(9) "persion1:" object(Person)#1 (3) { ["sex"]=> string(3) "Male" ["name"]=> string(6) "John" ["age"]=> int(25) }
string(9) "persion2:" object(Person)#2 (3) { ["sex"]=> string(3) "Male" ["name"]=> string(6) "John" ["age"]=> int(25) }
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