1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\web;
use Yii;
use yii\base\Component;
use yii\base\InvalidParamException;
/**
* Session provides session data management and the related configurations.
*
* Session is a Web application component that can be accessed via `Yii::$app->session`.
* To start the session, call [[open()]]; To complete and send out session data, call [[close()]];
* To destroy the session, call [[destroy()]].
*
* By default, [[autoStart]] is true which means the session will be started automatically
* when the session component is accessed the first time.
*
* Session can be used like an array to set and get session data. For example,
*
* ~~~
* $session = new Session;
* $session->open();
* $value1 = $session['name1']; // get session variable 'name1'
* $value2 = $session['name2']; // get session variable 'name2'
* foreach ($session as $name => $value) // traverse all session variables
* $session['name3'] = $value3; // set session variable 'name3'
* ~~~
*
* Session can be extended to support customized session storage.
* To do so, override [[useCustomStorage()]] so that it returns true, and
* override these methods with the actual logic about using custom storage:
* [[openSession()]], [[closeSession()]], [[readSession()]], [[writeSession()]],
* [[destroySession()]] and [[gcSession()]].
*
* Session also supports a special type of session data, called *flash messages*.
* A flash message is available only in the current request and the next request.
* After that, it will be deleted automatically. Flash messages are particularly
* useful for displaying confirmation messages. To use flash messages, simply
* call methods such as [[setFlash()]], [[getFlash()]].
*
* @property string $id The current session ID.
* @property string $name The current session name.
* @property boolean $isActive Whether the session has started
* @property string $savePath The current session save path, defaults to {@link http://php.net/manual/en/session.configuration.php#ini.session.save-path}.
* @property array $cookieParams The session cookie parameters.
* @property boolean $useCookies Whether cookies should be used to store session IDs.
* @property float $gCProbability The probability (percentage) that the gc (garbage collection) process is started on every session initialization, defaults to 1 meaning 1% chance.
* @property boolean $useTransparentSessionID Whether transparent sid support is enabled or not, defaults to false.
* @property integer $timeout The number of seconds after which data will be seen as 'garbage' and cleaned up, defaults to 1440 seconds.
* @property SessionIterator $iterator An iterator for traversing the session variables.
* @property integer $count The number of session variables.
* @property array $allFlashes The list of all flash messages.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Countable
{
/**
* @var boolean whether the session should be automatically started when the session component is initialized.
*/
public $autoStart = true;
/**
* @var string the name of the session variable that stores the flash message data.
*/
public $flashVar = '__flash';
/**
* @var array parameter-value pairs to override default session cookie parameters
*/
public $cookieParams = array(
'httpOnly' => true
);
/**
* Initializes the application component.
* This method is required by IApplicationComponent and is invoked by application.
*/
public function init()
{
parent::init();
if ($this->autoStart) {
$this->open();
}
register_shutdown_function(array($this, 'close'));
}
/**
* Returns a value indicating whether to use custom session storage.
* This method should be overridden to return true by child classes that implement custom session storage.
* To implement custom session storage, override these methods: [[openSession()]], [[closeSession()]],
* [[readSession()]], [[writeSession()]], [[destroySession()]] and [[gcSession()]].
* @return boolean whether to use custom storage.
*/
public function getUseCustomStorage()
{
return false;
}
private $_opened = false;
/**
* Starts the session.
*/
public function open()
{
// this is available in PHP 5.4.0+
if (function_exists('session_status')) {
if (session_status() == PHP_SESSION_ACTIVE) {
$this->_opened = true;
return;
}
}
if (!$this->_opened) {
if ($this->getUseCustomStorage()) {
@session_set_save_handler(
array($this, 'openSession'),
array($this, 'closeSession'),
array($this, 'readSession'),
array($this, 'writeSession'),
array($this, 'destroySession'),
array($this, 'gcSession')
);
}
$this->setCookieParams($this->cookieParams);
@session_start();
if (session_id() == '') {
$this->_opened = false;
$error = error_get_last();
$message = isset($error['message']) ? $error['message'] : 'Failed to start session.';
Yii::error($message, __METHOD__);
} else {
$this->_opened = true;
$this->updateFlashCounters();
}
}
}
/**
* Ends the current session and store session data.
*/
public function close()
{
$this->_opened = false;
if (session_id() !== '') {
@session_write_close();
}
}
/**
* Frees all session variables and destroys all data registered to a session.
*/
public function destroy()
{
if (session_id() !== '') {
@session_unset();
@session_destroy();
}
}
/**
* @return boolean whether the session has started
*/
public function getIsActive()
{
if (function_exists('session_status')) {
// available in PHP 5.4.0+
return session_status() == PHP_SESSION_ACTIVE;
} else {
// this is not very reliable
return $this->_opened && session_id() !== '';
}
}
/**
* @return string the current session ID
*/
public function getId()
{
return session_id();
}
/**
* @param string $value the session ID for the current session
*/
public function setId($value)
{
session_id($value);
}
/**
* Updates the current session ID with a newly generated one .
* Please refer to [[http://php.net/session_regenerate_id]] for more details.
* @param boolean $deleteOldSession Whether to delete the old associated session file or not.
*/
public function regenerateID($deleteOldSession = false)
{
session_regenerate_id($deleteOldSession);
}
/**
* @return string the current session name
*/
public function getName()
{
return session_name();
}
/**
* @param string $value the session name for the current session, must be an alphanumeric string.
* It defaults to "PHPSESSID".
*/
public function setName($value)
{
session_name($value);
}
/**
* @return string the current session save path, defaults to '/tmp'.
*/
public function getSavePath()
{
return session_save_path();
}
/**
* @param string $value the current session save path. This can be either a directory name or a path alias.
* @throws InvalidParamException if the path is not a valid directory
*/
public function setSavePath($value)
{
$path = Yii::getAlias($value);
if (is_dir($path)) {
session_save_path($path);
} else {
throw new InvalidParamException("Session save path is not a valid directory: $value");
}
}
/**
* @return array the session cookie parameters.
* @see http://us2.php.net/manual/en/function.session-get-cookie-params.php
*/
public function getCookieParams()
{
$params = session_get_cookie_params();
if (isset($params['httponly'])) {
$params['httpOnly'] = $params['httponly'];
unset($params['httponly']);
}
return $params;
}
/**
* Sets the session cookie parameters.
* The effect of this method only lasts for the duration of the script.
* Call this method before the session starts.
* @param array $value cookie parameters, valid keys include: `lifetime`, `path`, `domain`, `secure` and `httpOnly`.
* @throws InvalidParamException if the parameters are incomplete.
* @see http://us2.php.net/manual/en/function.session-set-cookie-params.php
*/
public function setCookieParams($value)
{
$data = $this->getCookieParams();
extract($data);
extract($value);
if (isset($lifetime, $path, $domain, $secure, $httpOnly)) {
session_set_cookie_params($lifetime, $path, $domain, $secure, $httpOnly);
} else {
throw new InvalidParamException('Please make sure these parameters are provided: lifetime, path, domain, secure and httpOnly.');
}
}
/**
* Returns the value indicating whether cookies should be used to store session IDs.
* @return boolean|null the value indicating whether cookies should be used to store session IDs.
* @see setUseCookies()
*/
public function getUseCookies()
{
if (ini_get('session.use_cookies') === '0') {
return false;
} elseif (ini_get('session.use_only_cookies') === '1') {
return true;
} else {
return null;
}
}
/**
* Sets the value indicating whether cookies should be used to store session IDs.
* Three states are possible:
*
* - true: cookies and only cookies will be used to store session IDs.
* - false: cookies will not be used to store session IDs.
* - null: if possible, cookies will be used to store session IDs; if not, other mechanisms will be used (e.g. GET parameter)
*
* @param boolean|null $value the value indicating whether cookies should be used to store session IDs.
*/
public function setUseCookies($value)
{
if ($value === false) {
ini_set('session.use_cookies', '0');
ini_set('session.use_only_cookies', '0');
} elseif ($value === true) {
ini_set('session.use_cookies', '1');
ini_set('session.use_only_cookies', '1');
} else {
ini_set('session.use_cookies', '1');
ini_set('session.use_only_cookies', '0');
}
}
/**
* @return float the probability (percentage) that the GC (garbage collection) process is started on every session initialization, defaults to 1 meaning 1% chance.
*/
public function getGCProbability()
{
return (float)(ini_get('session.gc_probability') / ini_get('session.gc_divisor') * 100);
}
/**
* @param float $value the probability (percentage) that the GC (garbage collection) process is started on every session initialization.
* @throws InvalidParamException if the value is not between 0 and 100.
*/
public function setGCProbability($value)
{
if ($value >= 0 && $value <= 100) {
// percent * 21474837 / 2147483647 ≈ percent * 0.01
ini_set('session.gc_probability', floor($value * 21474836.47));
ini_set('session.gc_divisor', 2147483647);
} else {
throw new InvalidParamException('GCProbability must be a value between 0 and 100.');
}
}
/**
* @return boolean whether transparent sid support is enabled or not, defaults to false.
*/
public function getUseTransparentSessionID()
{
return ini_get('session.use_trans_sid') == 1;
}
/**
* @param boolean $value whether transparent sid support is enabled or not.
*/
public function setUseTransparentSessionID($value)
{
ini_set('session.use_trans_sid', $value ? '1' : '0');
}
/**
* @return integer the number of seconds after which data will be seen as 'garbage' and cleaned up.
* The default value is 1440 seconds (or the value of "session.gc_maxlifetime" set in php.ini).
*/
public function getTimeout()
{
return (int)ini_get('session.gc_maxlifetime');
}
/**
* @param integer $value the number of seconds after which data will be seen as 'garbage' and cleaned up
*/
public function setTimeout($value)
{
ini_set('session.gc_maxlifetime', $value);
}
/**
* Session open handler.
* This method should be overridden if [[useCustomStorage()]] returns true.
* Do not call this method directly.
* @param string $savePath session save path
* @param string $sessionName session name
* @return boolean whether session is opened successfully
*/
public function openSession($savePath, $sessionName)
{
return true;
}
/**
* Session close handler.
* This method should be overridden if [[useCustomStorage()]] returns true.
* Do not call this method directly.
* @return boolean whether session is closed successfully
*/
public function closeSession()
{
return true;
}
/**
* Session read handler.
* This method should be overridden if [[useCustomStorage()]] returns true.
* Do not call this method directly.
* @param string $id session ID
* @return string the session data
*/
public function readSession($id)
{
return '';
}
/**
* Session write handler.
* This method should be overridden if [[useCustomStorage()]] returns true.
* Do not call this method directly.
* @param string $id session ID
* @param string $data session data
* @return boolean whether session write is successful
*/
public function writeSession($id, $data)
{
return true;
}
/**
* Session destroy handler.
* This method should be overridden if [[useCustomStorage()]] returns true.
* Do not call this method directly.
* @param string $id session ID
* @return boolean whether session is destroyed successfully
*/
public function destroySession($id)
{
return true;
}
/**
* Session GC (garbage collection) handler.
* This method should be overridden if [[useCustomStorage()]] returns true.
* Do not call this method directly.
* @param integer $maxLifetime the number of seconds after which data will be seen as 'garbage' and cleaned up.
* @return boolean whether session is GCed successfully
*/
public function gcSession($maxLifetime)
{
return true;
}
/**
* Returns an iterator for traversing the session variables.
* This method is required by the interface IteratorAggregate.
* @return SessionIterator an iterator for traversing the session variables.
*/
public function getIterator()
{
return new SessionIterator;
}
/**
* Returns the number of items in the session.
* @return integer the number of session variables
*/
public function getCount()
{
return count($_SESSION);
}
/**
* Returns the number of items in the session.
* This method is required by Countable interface.
* @return integer number of items in the session.
*/
public function count()
{
return $this->getCount();
}
/**
* Returns the session variable value with the session variable name.
* If the session variable does not exist, the `$defaultValue` will be returned.
* @param string $key the session variable name
* @param mixed $defaultValue the default value to be returned when the session variable does not exist.
* @return mixed the session variable value, or $defaultValue if the session variable does not exist.
*/
public function get($key, $defaultValue = null)
{
return isset($_SESSION[$key]) ? $_SESSION[$key] : $defaultValue;
}
/**
* Adds a session variable.
* If the specified name already exists, the old value will be overwritten.
* @param string $key session variable name
* @param mixed $value session variable value
*/
public function set($key, $value)
{
$_SESSION[$key] = $value;
}
/**
* Removes a session variable.
* @param string $key the name of the session variable to be removed
* @return mixed the removed value, null if no such session variable.
*/
public function remove($key)
{
if (isset($_SESSION[$key])) {
$value = $_SESSION[$key];
unset($_SESSION[$key]);
return $value;
} else {
return null;
}
}
/**
* Removes all session variables
*/
public function removeAll()
{
foreach (array_keys($_SESSION) as $key) {
unset($_SESSION[$key]);
}
}
/**
* @param mixed $key session variable name
* @return boolean whether there is the named session variable
*/
public function has($key)
{
return isset($_SESSION[$key]);
}
/**
* @return array the list of all session variables in array
*/
public function toArray()
{
return $_SESSION;
}
/**
* Updates the counters for flash messages and removes outdated flash messages.
* This method should only be called once in [[init()]].
*/
protected function updateFlashCounters()
{
$counters = $this->get($this->flashVar, array());
if (is_array($counters)) {
foreach ($counters as $key => $count) {
if ($count) {
unset($counters[$key], $_SESSION[$key]);
} else {
$counters[$key]++;
}
}
$_SESSION[$this->flashVar] = $counters;
} else {
// fix the unexpected problem that flashVar doesn't return an array
unset($_SESSION[$this->flashVar]);
}
}
/**
* Returns a flash message.
* A flash message is available only in the current request and the next request.
* @param string $key the key identifying the flash message
* @param mixed $defaultValue value to be returned if the flash message does not exist.
* @return mixed the flash message
*/
public function getFlash($key, $defaultValue = null)
{
$counters = $this->get($this->flashVar, array());
return isset($counters[$key]) ? $this->get($key, $defaultValue) : $defaultValue;
}
/**
* Returns all flash messages.
* @return array flash messages (key => message).
*/
public function getAllFlashes()
{
$counters = $this->get($this->flashVar, array());
$flashes = array();
foreach (array_keys($counters) as $key) {
if (isset($_SESSION[$key])) {
$flashes[$key] = $_SESSION[$key];
}
}
return $flashes;
}
/**
* Stores a flash message.
* A flash message is available only in the current request and the next request.
* @param string $key the key identifying the flash message. Note that flash messages
* and normal session variables share the same name space. If you have a normal
* session variable using the same name, its value will be overwritten by this method.
* @param mixed $value flash message
*/
public function setFlash($key, $value = true)
{
$counters = $this->get($this->flashVar, array());
$counters[$key] = 0;
$_SESSION[$key] = $value;
$_SESSION[$this->flashVar] = $counters;
}
/**
* Removes a flash message.
* Note that flash messages will be automatically removed after the next request.
* @param string $key the key identifying the flash message. Note that flash messages
* and normal session variables share the same name space. If you have a normal
* session variable using the same name, it will be removed by this method.
* @return mixed the removed flash message. Null if the flash message does not exist.
*/
public function removeFlash($key)
{
$counters = $this->get($this->flashVar, array());
$value = isset($_SESSION[$key], $counters[$key]) ? $_SESSION[$key] : null;
unset($counters[$key], $_SESSION[$key]);
$_SESSION[$this->flashVar] = $counters;
return $value;
}
/**
* Removes all flash messages.
* Note that flash messages and normal session variables share the same name space.
* If you have a normal session variable using the same name, it will be removed
* by this method.
*/
public function removeAllFlashes()
{
$counters = $this->get($this->flashVar, array());
foreach (array_keys($counters) as $key) {
unset($_SESSION[$key]);
}
unset($_SESSION[$this->flashVar]);
}
/**
* Returns a value indicating whether there is a flash message associated with the specified key.
* @param string $key key identifying the flash message
* @return boolean whether the specified flash message exists
*/
public function hasFlash($key)
{
return $this->getFlash($key) !== null;
}
/**
* This method is required by the interface ArrayAccess.
* @param mixed $offset the offset to check on
* @return boolean
*/
public function offsetExists($offset)
{
return isset($_SESSION[$offset]);
}
/**
* This method is required by the interface ArrayAccess.
* @param integer $offset the offset to retrieve element.
* @return mixed the element at the offset, null if no element is found at the offset
*/
public function offsetGet($offset)
{
return isset($_SESSION[$offset]) ? $_SESSION[$offset] : null;
}
/**
* This method is required by the interface ArrayAccess.
* @param integer $offset the offset to set element
* @param mixed $item the element value
*/
public function offsetSet($offset, $item)
{
$_SESSION[$offset] = $item;
}
/**
* This method is required by the interface ArrayAccess.
* @param mixed $offset the offset to unset element
*/
public function offsetUnset($offset)
{
unset($_SESSION[$offset]);
}
}