xref: /PHP-7.4/Zend/tests/lsb_018.phpt (revision 610c7fbe) 
1--TEST--
2ZE2 Late Static Binding and Singleton
3--FILE--
4<?php
5abstract class Singleton
6{
7	static private $instances = array();
8	static private $nextInstanceId = 0;
9	private $instanceId = NULL;
10	static final public function getInstance()
11	{
12		$caller = get_called_class();
13		if (!isset(self::$instances[$caller])) {
14			self::$instances[$caller] = new $caller;
15			self::$instances[$caller]->instanceId = self::$nextInstanceId++;
16		}
17		return self::$instances[$caller];
18	}
19	public final function getInstanceId()
20	{
21		return $this->instanceId;
22	}
23	public final function identify()
24	{
25		var_dump($this);
26	}
27}
28
29class Foo extends Singleton {
30}
31
32class Bar extends Singleton {
33}
34
35class Baz extends Bar {
36}
37
38$u = Foo::getInstance();
39$v = Bar::getInstance();
40$w = Baz::getInstance();
41
42$u->identify();
43$v->identify();
44$w->identify();
45
46$x = Foo::getInstance();
47$y = Bar::getInstance();
48$z = Baz::getInstance();
49
50$u->identify();
51$v->identify();
52$w->identify();
53$x->identify();
54$y->identify();
55$z->identify();
56?>
57===DONE===
58--EXPECTF--
59object(Foo)#%d (1) {
60  ["instanceId":"Singleton":private]=>
61  int(0)
62}
63object(Bar)#%d (1) {
64  ["instanceId":"Singleton":private]=>
65  int(1)
66}
67object(Baz)#%d (1) {
68  ["instanceId":"Singleton":private]=>
69  int(2)
70}
71object(Foo)#%d (1) {
72  ["instanceId":"Singleton":private]=>
73  int(0)
74}
75object(Bar)#%d (1) {
76  ["instanceId":"Singleton":private]=>
77  int(1)
78}
79object(Baz)#%d (1) {
80  ["instanceId":"Singleton":private]=>
81  int(2)
82}
83object(Foo)#%d (1) {
84  ["instanceId":"Singleton":private]=>
85  int(0)
86}
87object(Bar)#%d (1) {
88  ["instanceId":"Singleton":private]=>
89  int(1)
90}
91object(Baz)#%d (1) {
92  ["instanceId":"Singleton":private]=>
93  int(2)
94}
95===DONE===
96