xref: /PHP-7.2/Zend/tests/zend2.php.txt (revision 82194d27) 
1Example 1: A singleton (static members)
2=======================================
3
4<?php
5
6	class Counter {
7		var $counter = 0;
8
9		function increment_and_print()
10		{
11				print ++$this->counter;
12				print "\n";
13		}
14	}
15
16
17	class SingletonCounter {
18		static $m_instance = NULL;
19
20		function Instance()
21		{
22				if (self::$m_instance == NULL) {
23					self::$m_instance = new Counter();
24				}
25				return self::$m_instance;
26		}
27	}
28
29	SingletonCounter::Instance()->increment_and_print();
30	SingletonCounter::Instance()->increment_and_print();
31	SingletonCounter::Instance()->increment_and_print();
32
33?>
34
35Example 2: Factory method (derefencing objects returned from functions)
36=======================================================================
37
38<?php
39
40	class Circle {
41		function draw()
42		{
43			print "Circle\n";
44		}
45	}
46
47	class Square {
48		function draw()
49		{
50			print "Square\n";
51		}
52	}
53
54	function ShapeFactoryMethod($shape)
55	{
56		switch ($shape) {
57			case "Circle":
58				return new Circle();
59			case "Square":
60				return new Square();
61		}
62	}
63
64	ShapeFactoryMethod("Circle")->draw();
65	ShapeFactoryMethod("Square")->draw();
66
67
68?>
69
70Example 3: Class constants and class scope
71==========================================
72
73<?php
74
75	class ErrorCodes {
76		const FATAL = "Fatal error\n";
77		const WARNING = "Warning\n";
78		const INFO = "Informational message\n";
79
80		function print_fatal_error_codes()
81		{
82			print "FATAL = " . FATAL;
83			print "self::FATAL = " . self::FATAL;
84		}
85	}
86
87	/* Call the static function and move into the ErrorCodes scope */
88	ErrorCodes::print_fatal_error_codes();
89
90?>
91
92Example 4: Regular object method using both local and global functions
93======================================================================
94
95<?php
96
97	class HelloWorld {
98		const HELLO_WORLD = "Hello, World!\n";
99
100		function get_hello_world()
101		{
102			return HELLO_WORLD;
103		}
104
105		function length_of_hello_world()
106		{
107			$str = $this->get_hello_world();
108			return strlen($str);
109		}
110	}
111
112	$obj = new HelloWorld();
113	print "length_of_hello_world() = " . $obj->length_of_hello_world();
114	print "\n";
115?>
116
117Example 5: Multiple derefencing of objects returned from methods
118================================================================
119
120<?php
121
122
123	class Name {
124		function Name($_name)
125		{
126			$this->name = $_name;
127		}
128
129		function display()
130		{
131			print $this->name;
132			print "\n";
133		}
134	}
135
136	class Person {
137		function Person($_name, $_address)
138		{
139			$this->name = new Name($_name);
140		}
141
142		function getName()
143		{
144			return $this->name;
145		}
146	}
147
148	$person = new Person("John", "New York");
149	$person->getName()->display();
150
151?>
152
153Example 6: Exception handling
154=============================
155
156<?
157	class MyException {
158		function MyException($_error) {
159			$this->error = $_error;
160		}
161
162		function getException()
163		{
164			return $this->error;
165		}
166	}
167
168	function ThrowException()
169	{
170		throw new MyException("'This is an exception!'");
171	}
172
173
174	try {
175	} catch (MyException $exception) {
176		print "There was an exception: " . $exception->getException();
177		print "\n";
178	}
179
180	try {
181		ThrowException();
182	} catch (MyException $exception) {
183		print "There was an exception: " . $exception->getException();
184		print "\n";
185	}
186
187?>
188
189Example 7: __clone()
190===================
191
192<?
193	class MyCloneable {
194		static $id = 0;
195
196		function MyCloneable()
197		{
198			$this->id = self::$id++;
199		}
200
201		function __clone()
202		{
203			$this->name = $that->name;
204			$this->address = "New York";
205			$this->id = self::$id++;
206		}
207	}
208
209
210
211	$obj = new MyCloneable();
212
213	$obj->name = "Hello";
214	$obj->address = "Tel-Aviv";
215
216	print $obj->id;
217	print "\n";
218
219	$obj = $obj->__clone();
220
221	print $obj->id;
222	print "\n";
223	print $obj->name;
224	print "\n";
225	print $obj->address;
226	print "\n";
227?>
228
229Example 8: Unified constructors
230===============================
231
232<?
233
234	class BaseClass {
235		function __construct()
236		{
237			print "In BaseClass constructor\n";
238		}
239	}
240
241	class SubClass extends BaseClass {
242		function __construct()
243		{
244				parent::__construct();
245				print "In SubClass constructor\n";
246		}
247	}
248
249	$obj = new BaseClass();
250
251	$obj = new SubClass();
252
253?>
254
255Example 9: Destructors
256=======================
257
258<?php
259
260class MyDestructableClass {
261	function __construct()
262	{
263		print "In constructor\n";
264		$this->name = "MyDestructableClass";
265	}
266
267	function __destruct()
268	{
269		print "Destroying " . $this->name . "\n";
270	}
271}
272
273$obj = new MyDestructableClass();
274
275?>
276