学习php中clone的使用

3. class Person {

4. private $name;
5. private $age;
6. private $id;

7. function __construct( $name, $age ) {

8. $this->name = $name;
9. $this->age = $age;
10. }

11. function setId( $id ) {

12. $this->id = $id;
13. }
15. function __clone() {
16. $this->id = 0;
17. }
18. }
19. print "

    ";
    $person = new Person( "bob", 44 );
    $person->setId( 343 );
    $person2 = clone $person;
    print_r( $person );
    print_r( $person2 );
    print "

    ";
20. ?>

演示代码2：

3. class Account {

4. public $balance;
5. function __construct( $balance ) {
6. $this->balance = $balance;
7. }
8. }

9. class Person {

10. private $name;
11. private $age;
12. private $id;
13. public $account;

14. function __construct( $name, $age, Account $account ) {

15. $this->name = $name;
16. $this->age = $age;
17. $this->account = $account;
18. }

19. function setId( $id ) {

20. $this->id = $id;
21. }

22. function __clone() {

23. $this->id = 0;
24. }
25. }

26. $person = new Person( "bob", 44, new Account( 200 ) );

27. $person->setId( 343 );
28. $person2 = clone $person;

29. // give $person some money

30. $person->account->balance += 10;
31. // $person2 sees the credit too
32. print $person2->account->balance;

33. // output:

34. // 210
35. ?>

官方文档：http://cn2.php.com/__clone