phpBB/phpbb/user.php


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
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928

<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/

namespace phpbb;

/**
* Base user class
*
* This is the overarching class which contains (through session extend)
* all methods utilised for user functionality during a session.
*/
class user extends \phpbb\session
{
	var $lang = array();
	var $help = array();
	var $style = array();
	var $date_format;

	/**
	* DateTimeZone object holding the timezone of the user
	*/
	public $timezone;

	/**
	* @var string Class name of datetime object
	*/
	protected $datetime;

	var $lang_name = false;
	var $lang_id = false;
	var $lang_path;
	var $img_lang;
	var $img_array = array();

	// Able to add new options (up to id 31)
	var $keyoptions = array('viewimg' => 0, 'viewflash' => 1, 'viewsmilies' => 2, 'viewsigs' => 3, 'viewavatars' => 4, 'viewcensors' => 5, 'attachsig' => 6, 'bbcode' => 8, 'smilies' => 9, 'sig_bbcode' => 15, 'sig_smilies' => 16, 'sig_links' => 17);

	/**
	* Constructor to set the lang path
	* @param string $datetime_class Class name of datetime class
	*/
	function __construct($datetime_class)
	{
		global $phpbb_root_path;

		$this->lang_path = $phpbb_root_path . 'language/';
		$this->datetime = $datetime_class;
	}

	/**
	* Function to set custom language path (able to use directory outside of phpBB)
	*
	* @param string $lang_path New language path used.
	* @access public
	*/
	function set_custom_lang_path($lang_path)
	{
		$this->lang_path = $lang_path;

		if (substr($this->lang_path, -1) != '/')
		{
			$this->lang_path .= '/';
		}
	}

	/**
	* Setup basic user-specific items (style, language, ...)
	*/
	function setup($lang_set = false, $style_id = false)
	{
		global $db, $request, $template, $config, $auth, $phpEx, $phpbb_root_path, $cache;
		global $phpbb_dispatcher;

		if ($this->data['user_id'] != ANONYMOUS)
		{
			$user_lang_name = (file_exists($this->lang_path . $this->data['user_lang'] . "/common.$phpEx")) ? $this->data['user_lang'] : basename($config['default_lang']);
			$user_date_format = $this->data['user_dateformat'];
			$user_timezone = $this->data['user_timezone'];
		}
		else
		{
			$lang_override = $request->variable('language', '');
			if ($lang_override)
			{
				$this->set_cookie('lang', $lang_override, 0, false);
			}
			else
			{
				$lang_override = $request->variable($config['cookie_name'] . '_lang', '', true, \phpbb\request\request_interface::COOKIE);
			}
			if ($lang_override)
			{
				$use_lang = basename($lang_override);
				$user_lang_name = (file_exists($this->lang_path . $use_lang . "/common.$phpEx")) ? $use_lang : basename($config['default_lang']);
				$this->data['user_lang'] = $user_lang_name;
			}
			else
			{
				$user_lang_name = basename($config['default_lang']);
			}
			$user_date_format = $config['default_dateformat'];
			$user_timezone = $config['board_timezone'];

			/**
			* If a guest user is surfing, we try to guess his/her language first by obtaining the browser language
			* If re-enabled we need to make sure only those languages installed are checked
			* Commented out so we do not loose the code.

			if ($request->header('Accept-Language'))
			{
				$accept_lang_ary = explode(',', $request->header('Accept-Language'));

				foreach ($accept_lang_ary as $accept_lang)
				{
					// Set correct format ... guess full xx_YY form
					$accept_lang = substr($accept_lang, 0, 2) . '_' . strtoupper(substr($accept_lang, 3, 2));
					$accept_lang = basename($accept_lang);

					if (file_exists($this->lang_path . $accept_lang . "/common.$phpEx"))
					{
						$user_lang_name = $config['default_lang'] = $accept_lang;
						break;
					}
					else
					{
						// No match on xx_YY so try xx
						$accept_lang = substr($accept_lang, 0, 2);
						$accept_lang = basename($accept_lang);

						if (file_exists($this->lang_path . $accept_lang . "/common.$phpEx"))
						{
							$user_lang_name = $config['default_lang'] = $accept_lang;
							break;
						}
					}
				}
			}
			*/
		}

		$user_data = $this->data;
		$lang_set_ext = array();

		/**
		* Event to load language files and modify user data on every page
		*
		* @event core.user_setup
		* @var	array	user_data			Array with user's data row
		* @var	string	user_lang_name		Basename of the user's langauge
		* @var	string	user_date_format	User's date/time format
		* @var	string	user_timezone		User's timezone, should be one of
		*							http://www.php.net/manual/en/timezones.php
		* @var	mixed	lang_set			String or array of language files
		* @var	array	lang_set_ext		Array containing entries of format
		* 					array(
		* 						'ext_name' => (string) [extension name],
		* 						'lang_set' => (string|array) [language files],
		* 					)
		* 					For performance reasons, only load translations
		* 					that are absolutely needed globally using this
		* 					event. Use local events otherwise.
		* @var	mixed	style_id			Style we are going to display
		* @since 3.1.0-a1
		*/
		$vars = array(
			'user_data',
			'user_lang_name',
			'user_date_format',
			'user_timezone',
			'lang_set',
			'lang_set_ext',
			'style_id',
		);
		extract($phpbb_dispatcher->trigger_event('core.user_setup', compact($vars)));

		$this->data = $user_data;
		$this->lang_name = $user_lang_name;
		$this->date_format = $user_date_format;

		try
		{
			$this->timezone = new \DateTimeZone($user_timezone);
		}
		catch (\Exception $e)
		{
			// If the timezone the user has selected is invalid, we fall back to UTC.
			$this->timezone = new \DateTimeZone('UTC');
		}

		// We include common language file here to not load it every time a custom language file is included
		$lang = &$this->lang;

		// Do not suppress error if in DEBUG mode
		$include_result = (defined('DEBUG')) ? (include $this->lang_path . $this->lang_name . "/common.$phpEx") : (@include $this->lang_path . $this->lang_name . "/common.$phpEx");

		if ($include_result === false)
		{
			die('Language file ' . $this->lang_path . $this->lang_name . "/common.$phpEx" . " couldn't be opened.");
		}

		$this->add_lang($lang_set);
		unset($lang_set);

		foreach ($lang_set_ext as $ext_lang_pair)
		{
			$this->add_lang_ext($ext_lang_pair['ext_name'], $ext_lang_pair['lang_set']);
		}
		unset($lang_set_ext);

		$style_request = $request->variable('style', 0);
		if ($style_request && (!$config['override_user_style'] || $auth->acl_get('a_styles')) && !defined('ADMIN_START'))
		{
			global $SID, $_EXTRA_URL;

			$style_id = $style_request;
			$SID .= '&amp;style=' . $style_id;
			$_EXTRA_URL = array('style=' . $style_id);
		}
		else
		{
			// Set up style
			$style_id = ($style_id) ? $style_id : ((!$config['override_user_style']) ? $this->data['user_style'] : $config['default_style']);
		}

		$sql = 'SELECT *
			FROM ' . STYLES_TABLE . " s
			WHERE s.style_id = $style_id";
		$result = $db->sql_query($sql, 3600);
		$this->style = $db->sql_fetchrow($result);
		$db->sql_freeresult($result);

		// Fallback to user's standard style
		if (!$this->style && $style_id != $this->data['user_style'])
		{
			$style_id = $this->data['user_style'];

			$sql = 'SELECT *
				FROM ' . STYLES_TABLE . " s
				WHERE s.style_id = $style_id";
			$result = $db->sql_query($sql, 3600);
			$this->style = $db->sql_fetchrow($result);
			$db->sql_freeresult($result);
		}

		// User has wrong style
		if (!$this->style && $style_id == $this->data['user_style'])
		{
			$style_id = $this->data['user_style'] = $config['default_style'];

			$sql = 'UPDATE ' . USERS_TABLE . "
				SET user_style = $style_id
				WHERE user_id = {$this->data['user_id']}";
			$db->sql_query($sql);

			$sql = 'SELECT *
				FROM ' . STYLES_TABLE . " s
				WHERE s.style_id = $style_id";
			$result = $db->sql_query($sql, 3600);
			$this->style = $db->sql_fetchrow($result);
			$db->sql_freeresult($result);
		}

		if (!$this->style)
		{
			trigger_error('NO_STYLE_DATA', E_USER_ERROR);
		}

		// Now parse the cfg file and cache it
		$parsed_items = $cache->obtain_cfg_items($this->style);

		$check_for = array(
			'pagination_sep'    => (string) ', '
		);

		foreach ($check_for as $key => $default_value)
		{
			$this->style[$key] = (isset($parsed_items[$key])) ? $parsed_items[$key] : $default_value;
			settype($this->style[$key], gettype($default_value));

			if (is_string($default_value))
			{
				$this->style[$key] = htmlspecialchars($this->style[$key]);
			}
		}

		$template->set_style();

		$this->img_lang = $this->lang_name;

		// Call phpbb_user_session_handler() in case external application want to "bend" some variables or replace classes...
		// After calling it we continue script execution...
		phpbb_user_session_handler();

		// If this function got called from the error handler we are finished here.
		if (defined('IN_ERROR_HANDLER'))
		{
			return;
		}

		// Disable board if the install/ directory is still present
		// For the brave development army we do not care about this, else we need to comment out this everytime we develop locally
		if (!defined('DEBUG') && !defined('ADMIN_START') && !defined('IN_INSTALL') && !defined('IN_LOGIN') && file_exists($phpbb_root_path . 'install') && !is_file($phpbb_root_path . 'install'))
		{
			// Adjust the message slightly according to the permissions
			if ($auth->acl_gets('a_', 'm_') || $auth->acl_getf_global('m_'))
			{
				$message = 'REMOVE_INSTALL';
			}
			else
			{
				$message = (!empty($config['board_disable_msg'])) ? $config['board_disable_msg'] : 'BOARD_DISABLE';
			}
			trigger_error($message);
		}

		// Is board disabled and user not an admin or moderator?
		if ($config['board_disable'] && !defined('IN_LOGIN') && !defined('SKIP_CHECK_DISABLED') && !$auth->acl_gets('a_', 'm_') && !$auth->acl_getf_global('m_'))
		{
			if ($this->data['is_bot'])
			{
				send_status_line(503, 'Service Unavailable');
			}

			$message = (!empty($config['board_disable_msg'])) ? $config['board_disable_msg'] : 'BOARD_DISABLE';
			trigger_error($message);
		}

		// Is load exceeded?
		if ($config['limit_load'] && $this->load !== false)
		{
			if ($this->load > floatval($config['limit_load']) && !defined('IN_LOGIN') && !defined('IN_ADMIN'))
			{
				// Set board disabled to true to let the admins/mods get the proper notification
				$config['board_disable'] = '1';

				if (!$auth->acl_gets('a_', 'm_') && !$auth->acl_getf_global('m_'))
				{
					if ($this->data['is_bot'])
					{
						send_status_line(503, 'Service Unavailable');
					}
					trigger_error('BOARD_UNAVAILABLE');
				}
			}
		}

		if (isset($this->data['session_viewonline']))
		{
			// Make sure the user is able to hide his session
			if (!$this->data['session_viewonline'])
			{
				// Reset online status if not allowed to hide the session...
				if (!$auth->acl_get('u_hideonline'))
				{
					$sql = 'UPDATE ' . SESSIONS_TABLE . '
						SET session_viewonline = 1
						WHERE session_user_id = ' . $this->data['user_id'];
					$db->sql_query($sql);
					$this->data['session_viewonline'] = 1;
				}
			}
			else if (!$this->data['user_allow_viewonline'])
			{
				// the user wants to hide and is allowed to  -> cloaking device on.
				if ($auth->acl_get('u_hideonline'))
				{
					$sql = 'UPDATE ' . SESSIONS_TABLE . '
						SET session_viewonline = 0
						WHERE session_user_id = ' . $this->data['user_id'];
					$db->sql_query($sql);
					$this->data['session_viewonline'] = 0;
				}
			}
		}

		// Does the user need to change their password? If so, redirect to the
		// ucp profile reg_details page ... of course do not redirect if we're already in the ucp
		if (!defined('IN_ADMIN') && !defined('ADMIN_START') && $config['chg_passforce'] && !empty($this->data['is_registered']) && $auth->acl_get('u_chgpasswd') && $this->data['user_passchg'] < time() - ($config['chg_passforce'] * 86400))
		{
			if (strpos($this->page['query_string'], 'mode=reg_details') === false && $this->page['page_name'] != "ucp.$phpEx")
			{
				redirect(append_sid("{$phpbb_root_path}ucp.$phpEx", 'i=profile&amp;mode=reg_details'));
			}
		}

		return;
	}

	/**
	* More advanced language substitution
	* Function to mimic sprintf() with the possibility of using phpBB's language system to substitute nullar/singular/plural forms.
	* Params are the language key and the parameters to be substituted.
	* This function/functionality is inspired by SHS` and Ashe.
	*
	* Example call: <samp>$user->lang('NUM_POSTS_IN_QUEUE', 1);</samp>
	*
	* If the first parameter is an array, the elements are used as keys and subkeys to get the language entry:
	* Example: <samp>$user->lang(array('datetime', 'AGO'), 1)</samp> uses $user->lang['datetime']['AGO'] as language entry.
	*/
	function lang()
	{
		$args = func_get_args();
		$key = $args[0];

		if (is_array($key))
		{
			$lang = &$this->lang[array_shift($key)];

			foreach ($key as $_key)
			{
				$lang = &$lang[$_key];
			}
		}
		else
		{
			$lang = &$this->lang[$key];
		}

		// Return if language string does not exist
		if (!isset($lang) || (!is_string($lang) && !is_array($lang)))
		{
			return $key;
		}

		// If the language entry is a string, we simply mimic sprintf() behaviour
		if (is_string($lang))
		{
			if (sizeof($args) == 1)
			{
				return $lang;
			}

			// Replace key with language entry and simply pass along...
			$args[0] = $lang;
			return call_user_func_array('sprintf', $args);
		}
		else if (sizeof($lang) == 0)
		{
			// If the language entry is an empty array, we just return the language key
			return $args[0];
		}

		// It is an array... now handle different nullar/singular/plural forms
		$key_found = false;

		// We now get the first number passed and will select the key based upon this number
		for ($i = 1, $num_args = sizeof($args); $i < $num_args; $i++)
		{
			if (is_int($args[$i]) || is_float($args[$i]))
			{
				if ($args[$i] == 0 && isset($lang[0]))
				{
					// We allow each translation using plural forms to specify a version for the case of 0 things,
					// so that "0 users" may be displayed as "No users".
					$key_found = 0;
					break;
				}
				else
				{
					$use_plural_form = $this->get_plural_form($args[$i]);
					if (isset($lang[$use_plural_form]))
					{
						// The key we should use exists, so we use it.
						$key_found = $use_plural_form;
					}
					else
					{
						// If the key we need to use does not exist, we fall back to the previous one.
						$numbers = array_keys($lang);

						foreach ($numbers as $num)
						{
							if ($num > $use_plural_form)
							{
								break;
							}

							$key_found = $num;
						}
					}
					break;
				}
			}
		}

		// Ok, let's check if the key was found, else use the last entry (because it is mostly the plural form)
		if ($key_found === false)
		{
			$numbers = array_keys($lang);
			$key_found = end($numbers);
		}

		// Use the language string we determined and pass it to sprintf()
		$args[0] = $lang[$key_found];
		return call_user_func_array('sprintf', $args);
	}

	/**
	* Determine which plural form we should use.
	* For some languages this is not as simple as for English.
	*
	* @param $number        int|float   The number we want to get the plural case for. Float numbers are floored.
	* @param $force_rule    mixed   False to use the plural rule of the language package
	*                               or an integer to force a certain plural rule
	* @return   int     The plural-case we need to use for the number plural-rule combination
	*/
	function get_plural_form($number, $force_rule = false)
	{
		$number = (int) $number;

		// Default to English system
		$plural_rule = ($force_rule !== false) ? $force_rule : ((isset($this->lang['PLURAL_RULE'])) ? $this->lang['PLURAL_RULE'] : 1);

		return phpbb_get_plural_form($plural_rule, $number);
	}

	/**
	* Add Language Items - use_db and use_help are assigned where needed (only use them to force inclusion)
	*
	* @param mixed $lang_set specifies the language entries to include
	* @param bool $use_db internal variable for recursion, do not use
	* @param bool $use_help internal variable for recursion, do not use
	* @param string $ext_name The extension to load language from, or empty for core files
	*
	* Examples:
	* <code>
	* $lang_set = array('posting', 'help' => 'faq');
	* $lang_set = array('posting', 'viewtopic', 'help' => array('bbcode', 'faq'))
	* $lang_set = array(array('posting', 'viewtopic'), 'help' => array('bbcode', 'faq'))
	* $lang_set = 'posting'
	* $lang_set = array('help' => 'faq', 'db' => array('help:faq', 'posting'))
	* </code>
	*/
	function add_lang($lang_set, $use_db = false, $use_help = false, $ext_name = '')
	{
		global $phpEx;

		if (is_array($lang_set))
		{
			foreach ($lang_set as $key => $lang_file)
			{
				// Please do not delete this line.
				// We have to force the type here, else [array] language inclusion will not work
				$key = (string) $key;

				if ($key == 'db')
				{
					$this->add_lang($lang_file, true, $use_help, $ext_name);
				}
				else if ($key == 'help')
				{
					$this->add_lang($lang_file, $use_db, true, $ext_name);
				}
				else if (!is_array($lang_file))
				{
					$this->set_lang($this->lang, $this->help, $lang_file, $use_db, $use_help, $ext_name);
				}
				else
				{
					$this->add_lang($lang_file, $use_db, $use_help, $ext_name);
				}
			}
			unset($lang_set);
		}
		else if ($lang_set)
		{
			$this->set_lang($this->lang, $this->help, $lang_set, $use_db, $use_help, $ext_name);
		}
	}

	/**
	* Add Language Items from an extension - use_db and use_help are assigned where needed (only use them to force inclusion)
	*
	* @param string $ext_name The extension to load language from, or empty for core files
	* @param mixed $lang_set specifies the language entries to include
	* @param bool $use_db internal variable for recursion, do not use
	* @param bool $use_help internal variable for recursion, do not use
	*/
	function add_lang_ext($ext_name, $lang_set, $use_db = false, $use_help = false)
	{
		if ($ext_name === '/')
		{
			$ext_name = '';
		}

		$this->add_lang($lang_set, $use_db, $use_help, $ext_name);
	}

	/**
	* Set language entry (called by add_lang)
	* @access private
	*/
	function set_lang(&$lang, &$help, $lang_file, $use_db = false, $use_help = false, $ext_name = '')
	{
		global $phpbb_root_path, $phpEx;

		// Make sure the language name is set (if the user setup did not happen it is not set)
		if (!$this->lang_name)
		{
			global $config;
			$this->lang_name = basename($config['default_lang']);
		}

		// $lang == $this->lang
		// $help == $this->help
		// - add appropriate variables here, name them as they are used within the language file...
		if (!$use_db)
		{
			if ($use_help && strpos($lang_file, '/') !== false)
			{
				$filename = dirname($lang_file) . '/help_' . basename($lang_file);
			}
			else
			{
				$filename = (($use_help) ? 'help_' : '') . $lang_file;
			}

			if ($ext_name)
			{
				global $phpbb_extension_manager;
				$ext_path = $phpbb_extension_manager->get_extension_path($ext_name, true);

				$lang_path = $ext_path . 'language/';
			}
			else
			{
				$lang_path = $this->lang_path;
			}

			if (strpos($phpbb_root_path . $filename, $lang_path . $this->lang_name . '/') === 0)
			{
				$language_filename = $phpbb_root_path . $filename;
			}
			else
			{
				$language_filename = $lang_path . $this->lang_name . '/' . $filename . '.' . $phpEx;
			}

			// If we are in install, try to use the updated version, when available
			$install_language_filename = str_replace('language/', 'install/update/new/language/', $language_filename);
			if (defined('IN_INSTALL') && file_exists($install_language_filename))
			{
				$language_filename = $install_language_filename;
			}

			if (!file_exists($language_filename))
			{
				global $config;

				if ($this->lang_name == 'en')
				{
					// The user's selected language is missing the file, the board default's language is missing the file, and the file doesn't exist in /en.
					$language_filename = str_replace($lang_path . 'en', $lang_path . $this->data['user_lang'], $language_filename);
					trigger_error('Language file ' . $language_filename . ' couldn\'t be opened.', E_USER_ERROR);
				}
				else if ($this->lang_name == basename($config['default_lang']))
				{
					// Fall back to the English Language
					$reset_lang_name = $this->lang_name;
					$this->lang_name = 'en';
					$this->set_lang($lang, $help, $lang_file, $use_db, $use_help, $ext_name);
					$this->lang_name = $reset_lang_name;
				}
				else if ($this->lang_name == $this->data['user_lang'])
				{
					// Fall back to the board default language
					$reset_lang_name = $this->lang_name;
					$this->lang_name = basename($config['default_lang']);
					$this->set_lang($lang, $help, $lang_file, $use_db, $use_help, $ext_name);
					$this->lang_name = $reset_lang_name;
				}

				return;
			}

			// Do not suppress error if in DEBUG mode
			$include_result = (defined('DEBUG')) ? (include $language_filename) : (@include $language_filename);

			if ($include_result === false)
			{
				trigger_error('Language file ' . $language_filename . ' couldn\'t be opened.', E_USER_ERROR);
			}
		}
		else if ($use_db)
		{
			// Get Database Language Strings
			// Put them into $lang if nothing is prefixed, put them into $help if help: is prefixed
			// For example: help:faq, posting
		}
	}

	/**
	* Format user date
	*
	* @param int $gmepoch unix timestamp
	* @param string $format date format in date() notation. | used to indicate relative dates, for example |d m Y|, h:i is translated to Today, h:i.
	* @param bool $forcedate force non-relative date format.
	*
	* @return mixed translated date
	*/
	function format_date($gmepoch, $format = false, $forcedate = false)
	{
		static $utc;

		if (!isset($utc))
		{
			$utc = new \DateTimeZone('UTC');
		}

		$time = new $this->datetime($this, "@$gmepoch", $utc);
		$time->setTimezone($this->timezone);

		return $time->format($format, $forcedate);
	}

	/**
	* Create a \phpbb\datetime object in the context of the current user
	*
	* @since 3.1
	* @param string $time String in a format accepted by strtotime().
	* @param DateTimeZone $timezone Time zone of the time.
	* @return \phpbb\datetime Date time object linked to the current users locale
	*/
	public function create_datetime($time = 'now', \DateTimeZone $timezone = null)
	{
		$timezone = $timezone ?: $this->timezone;
		return new $this->datetime($this, $time, $timezone);
	}

	/**
	* Get the UNIX timestamp for a datetime in the users timezone, so we can store it in the database.
	*
	* @param	string			$format		Format of the entered date/time
	* @param	string			$time		Date/time with the timezone applied
	* @param	DateTimeZone	$timezone	Timezone of the date/time, falls back to timezone of current user
	* @return	int			Returns the unix timestamp
	*/
	public function get_timestamp_from_format($format, $time, \DateTimeZone $timezone = null)
	{
		$timezone = $timezone ?: $this->timezone;
		$date = \DateTime::createFromFormat($format, $time, $timezone);
		return ($date !== false) ? $date->format('U') : false;
	}

	/**
	* Get language id currently used by the user
	*/
	function get_iso_lang_id()
	{
		global $config, $db;

		if (!empty($this->lang_id))
		{
			return $this->lang_id;
		}

		if (!$this->lang_name)
		{
			$this->lang_name = $config['default_lang'];
		}

		$sql = 'SELECT lang_id
			FROM ' . LANG_TABLE . "
			WHERE lang_iso = '" . $db->sql_escape($this->lang_name) . "'";
		$result = $db->sql_query($sql);
		$this->lang_id = (int) $db->sql_fetchfield('lang_id');
		$db->sql_freeresult($result);

		return $this->lang_id;
	}

	/**
	* Get users profile fields
	*/
	function get_profile_fields($user_id)
	{
		global $db;

		if (isset($this->profile_fields))
		{
			return;
		}

		$sql = 'SELECT *
			FROM ' . PROFILE_FIELDS_DATA_TABLE . "
			WHERE user_id = $user_id";
		$result = $db->sql_query_limit($sql, 1);
		$this->profile_fields = (!($row = $db->sql_fetchrow($result))) ? array() : $row;
		$db->sql_freeresult($result);
	}

	/**
	* Specify/Get image
	*/
	function img($img, $alt = '')
	{
		$title = '';

		if ($alt)
		{
			$alt = $this->lang($alt);
			$title = ' title="' . $alt . '"';
		}
		return '<span class="imageset ' . $img . '"' . $title . '>' . $alt . '</span>';
	}

	/**
	* Get option bit field from user options.
	*
	* @param int $key option key, as defined in $keyoptions property.
	* @param int $data bit field value to use, or false to use $this->data['user_options']
	* @return bool true if the option is set in the bit field, false otherwise
	*/
	function optionget($key, $data = false)
	{
		$var = ($data !== false) ? $data : $this->data['user_options'];
		return phpbb_optionget($this->keyoptions[$key], $var);
	}

	/**
	* Set option bit field for user options.
	*
	* @param int $key Option key, as defined in $keyoptions property.
	* @param bool $value True to set the option, false to clear the option.
	* @param int $data Current bit field value, or false to use $this->data['user_options']
	* @return int|bool If $data is false, the bit field is modified and
	*                  written back to $this->data['user_options'], and
	*                  return value is true if the bit field changed and
	*                  false otherwise. If $data is not false, the new
	*                  bitfield value is returned.
	*/
	function optionset($key, $value, $data = false)
	{
		$var = ($data !== false) ? $data : $this->data['user_options'];

		$new_var = phpbb_optionset($this->keyoptions[$key], $value, $var);

		if ($data === false)
		{
			if ($new_var != $var)
			{
				$this->data['user_options'] = $new_var;
				return true;
			}
			else
			{
				return false;
			}
		}
		else
		{
			return $new_var;
		}
	}

	/**
	* Funtion to make the user leave the NEWLY_REGISTERED system group.
	* @access public
	*/
	function leave_newly_registered()
	{
		global $db;

		if (empty($this->data['user_new']))
		{
			return false;
		}

		if (!function_exists('remove_newly_registered'))
		{
			global $phpbb_root_path, $phpEx;

			include($phpbb_root_path . 'includes/functions_user.' . $phpEx);
		}
		if ($group = remove_newly_registered($this->data['user_id'], $this->data))
		{
			$this->data['group_id'] = $group;

		}
		$this->data['user_permissions'] = '';
		$this->data['user_new'] = 0;

		return true;
	}

	/**
	* Returns all password protected forum ids the user is currently NOT authenticated for.
	*
	* @return array     Array of forum ids
	* @access public
	*/
	function get_passworded_forums()
	{
		global $db;

		$sql = 'SELECT f.forum_id, fa.user_id
			FROM ' . FORUMS_TABLE . ' f
			LEFT JOIN ' . FORUMS_ACCESS_TABLE . " fa
				ON (fa.forum_id = f.forum_id
					AND fa.session_id = '" . $db->sql_escape($this->session_id) . "')
			WHERE f.forum_password <> ''";
		$result = $db->sql_query($sql);

		$forum_ids = array();
		while ($row = $db->sql_fetchrow($result))
		{
			$forum_id = (int) $row['forum_id'];

			if ($row['user_id'] != $this->data['user_id'])
			{
				$forum_ids[$forum_id] = $forum_id;
			}
		}
		$db->sql_freeresult($result);

		return $forum_ids;
	}
}