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source: subversion/trunk/roundcubemail/program/include/rcube_contacts.php @ 4834

Last change on this file since 4834 was 4834, checked in by alec, 2 years ago
Added addressbook advanced search
Property svn:keywords set to `Id`
File size: 26.8 KB

Line
1	<?php
2
3	/*
4	+-----------------------------------------------------------------------+
5	\| program/include/rcube_contacts.php \|
6	\| \|
7	\| This file is part of the Roundcube Webmail client \|
8	\| Copyright (C) 2006-2011, The Roundcube Dev Team \|
9	\| Licensed under the GNU GPL \|
10	\| \|
11	\| PURPOSE: \|
12	\| Interface to the local address book database \|
13	\| \|
14	+-----------------------------------------------------------------------+
15	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
16	+-----------------------------------------------------------------------+
17
18	$Id$
19
20	*/
21
22
23	/**
24	* Model class for the local address book database
25	*
26	* @package Addressbook
27	*/
28	class rcube_contacts extends rcube_addressbook
29	{
30	// protected for backward compat. with some plugins
31	protected $db_name = 'contacts';
32	protected $db_groups = 'contactgroups';
33	protected $db_groupmembers = 'contactgroupmembers';
34
35	/**
36	* Store database connection.
37	*
38	* @var rcube_mdb2
39	*/
40	private $db = null;
41	private $user_id = 0;
42	private $filter = null;
43	private $result = null;
44	private $cache;
45	private $table_cols = array('name', 'email', 'firstname', 'surname');
46	private $fulltext_cols = array('name', 'firstname', 'surname', 'middlename', 'nickname',
47	'jobtitle', 'organization', 'department', 'maidenname', 'email', 'phone',
48	'address', 'street', 'locality', 'zipcode', 'region', 'country', 'website', 'im', 'notes');
49
50	// public properties
51	public $primary_key = 'contact_id';
52	public $readonly = false;
53	public $groups = true;
54	public $list_page = 1;
55	public $page_size = 10;
56	public $group_id = 0;
57	public $ready = false;
58	public $coltypes = array('name', 'firstname', 'surname', 'middlename', 'prefix', 'suffix', 'nickname',
59	'jobtitle', 'organization', 'department', 'assistant', 'manager',
60	'gender', 'maidenname', 'spouse', 'email', 'phone', 'address',
61	'birthday', 'anniversary', 'website', 'im', 'notes', 'photo');
62
63
64	/**
65	* Object constructor
66	*
67	* @param object Instance of the rcube_db class
68	* @param integer User-ID
69	*/
70	function __construct($dbconn, $user)
71	{
72	$this->db = $dbconn;
73	$this->user_id = $user;
74	$this->ready = $this->db && !$this->db->is_error();
75	}
76
77
78	/**
79	* Save a search string for future listings
80	*
81	* @param string SQL params to use in listing method
82	*/
83	function set_search_set($filter)
84	{
85	$this->filter = $filter;
86	$this->cache = null;
87	}
88
89
90	/**
91	* Getter for saved search properties
92	*
93	* @return mixed Search properties used by this class
94	*/
95	function get_search_set()
96	{
97	return $this->filter;
98	}
99
100
101	/**
102	* Setter for the current group
103	* (empty, has to be re-implemented by extending class)
104	*/
105	function set_group($gid)
106	{
107	$this->group_id = $gid;
108	$this->cache = null;
109	}
110
111
112	/**
113	* Reset all saved results and search parameters
114	*/
115	function reset()
116	{
117	$this->result = null;
118	$this->filter = null;
119	$this->cache = null;
120	}
121
122
123	/**
124	* List all active contact groups of this source
125	*
126	* @param string Search string to match group name
127	* @return array Indexed list of contact groups, each a hash array
128	*/
129	function list_groups($search = null)
130	{
131	$results = array();
132
133	if (!$this->groups)
134	return $results;
135
136	$sql_filter = $search ? " AND " . $this->db->ilike('name', '%'.$search.'%') : '';
137
138	$sql_result = $this->db->query(
139	"SELECT * FROM ".get_table_name($this->db_groups).
140	" WHERE del<>1".
141	" AND user_id=?".
142	$sql_filter.
143	" ORDER BY name",
144	$this->user_id);
145
146	while ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
147	$sql_arr['ID'] = $sql_arr['contactgroup_id'];
148	$results[] = $sql_arr;
149	}
150
151	return $results;
152	}
153
154
155	/**
156	* List the current set of contact records
157	*
158	* @param array List of cols to show, Null means all
159	* @param int Only return this number of records, use negative values for tail
160	* @param boolean True to skip the count query (select only)
161	* @return array Indexed list of contact records, each a hash array
162	*/
163	function list_records($cols=null, $subset=0, $nocount=false)
164	{
165	if ($nocount \|\| $this->list_page <= 1) {
166	// create dummy result, we don't need a count now
167	$this->result = new rcube_result_set();
168	} else {
169	// count all records
170	$this->result = $this->count();
171	}
172
173	$start_row = $subset < 0 ? $this->result->first + $this->page_size + $subset : $this->result->first;
174	$length = $subset != 0 ? abs($subset) : $this->page_size;
175
176	if ($this->group_id)
177	$join = " LEFT JOIN ".get_table_name($this->db_groupmembers)." AS m".
178	" ON (m.contact_id = c.".$this->primary_key.")";
179
180	$sql_result = $this->db->limitquery(
181	"SELECT * FROM ".get_table_name($this->db_name)." AS c" .
182	$join .
183	" WHERE c.del<>1" .
184	" AND c.user_id=?" .
185	($this->group_id ? " AND m.contactgroup_id=?" : "").
186	($this->filter ? " AND (".$this->filter.")" : "") .
187	" ORDER BY ". $this->db->concat('c.name', 'c.email'),
188	$start_row,
189	$length,
190	$this->user_id,
191	$this->group_id);
192
193	// determine whether we have to parse the vcard or if only db cols are requested
194	$read_vcard = !$cols \|\| count(array_intersect($cols, $this->table_cols)) < count($cols);
195
196	while ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
197	$sql_arr['ID'] = $sql_arr[$this->primary_key];
198
199	if ($read_vcard)
200	$sql_arr = $this->convert_db_data($sql_arr);
201	else
202	$sql_arr['email'] = preg_split('/,\s*/', $sql_arr['email']);
203
204	// make sure we have a name to display
205	if (empty($sql_arr['name'])) {
206	if (empty($sql_arr['email']))
207	$sql_arr['email'] = $this->get_col_values('email', $sql_arr, true);
208	$sql_arr['name'] = $sql_arr['email'][0];
209	}
210
211	$this->result->add($sql_arr);
212	}
213
214	$cnt = count($this->result->records);
215
216	// update counter
217	if ($nocount)
218	$this->result->count = $cnt;
219	else if ($this->list_page <= 1) {
220	if ($cnt < $this->page_size && $subset == 0)
221	$this->result->count = $cnt;
222	else if (isset($this->cache['count']))
223	$this->result->count = $this->cache['count'];
224	else
225	$this->result->count = $this->_count();
226	}
227
228	return $this->result;
229	}
230
231
232	/**
233	* Search contacts
234	*
235	* @param mixed $fields The field name of array of field names to search in
236	* @param mixed $value Search value (or array of values when $fields is array)
237	* @param boolean $strict True for strict (=), False for partial (LIKE) matching
238	* @param boolean $select True if results are requested, False if count only
239	* @param boolean $nocount True to skip the count query (select only)
240	* @param array $required List of fields that cannot be empty
241	*
242	* @return object rcube_result_set Contact records and 'count' value
243	*/
244	function search($fields, $value, $strict=false, $select=true, $nocount=false, $required=array())
245	{
246	if (!is_array($fields))
247	$fields = array($fields);
248	if (!is_array($required) && !empty($required))
249	$required = array($required);
250
251	$where = $and_where = array();
252
253	foreach ($fields as $idx => $col) {
254	// direct ID search
255	if ($col == 'ID' \|\| $col == $this->primary_key) {
256	$ids = !is_array($value) ? explode(',', $value) : $value;
257	$ids = $this->db->array2list($ids, 'integer');
258	$where[] = 'c.' . $this->primary_key.' IN ('.$ids.')';
259	continue;
260	}
261	// fulltext search in all fields
262	else if ($col == '*') {
263	$words = array();
264	foreach (explode(" ", self::normalize_string($value)) as $word)
265	$words[] = $this->db->ilike('words', '%'.$word.'%');
266	$where[] = '(' . join(' AND ', $words) . ')';
267	}
268	else {
269	$val = is_array($value) ? $value[$idx] : $value;
270	// table column
271	if (in_array($col, $this->table_cols)) {
272	if ($strict) {
273	$where[] = $this->db->quoteIdentifier($col).' = '.$this->db->quote($val);
274	}
275	else {
276	$where[] = $this->db->ilike($col, '%'.$val.'%');
277	}
278	}
279	// vCard field
280	else {
281	if (in_array($col, $this->fulltext_cols)) {
282	foreach (explode(" ", self::normalize_string($val)) as $word)
283	$words[] = $this->db->ilike('words', '%'.$word.'%');
284	$where[] = '(' . join(' AND ', $words) . ')';
285	}
286	if (is_array($value))
287	$post_search[$col] = $strict ? $val : mb_strtolower($val);
288	}
289	}
290	}
291
292	foreach ($required as $col) {
293	$and_where[] = $this->db->quoteIdentifier($col).' <> '.$this->db->quote('');
294	}
295
296	if (!empty($where)) {
297	// use AND operator for advanced searches
298	$where = join(is_array($value) ? ' AND ' : ' OR ', $where);
299	}
300
301	if (!empty($and_where))
302	$where = ($where ? "($where) AND " : '') . join(' AND ', $and_where);
303
304	// Post-searching in vCard data fields
305	// we will search in all records and then build a where clause for their IDs
306	if (!empty($post_search)) {
307	$ids = array(0);
308	// build key name regexp
309	$regexp = '/^(' . implode(array_keys($post_search), '\|') . ')(:.*?)$/';
310	// use initial WHERE clause, to limit records number if possible
311	if (!empty($where))
312	$this->set_search_set($where);
313
314	// count result pages
315	$cnt = $this->count();
316	$pages = ceil($cnt / $this->page_size);
317	$scnt = count($post_search);
318
319	// get (paged) result
320	for ($i=0; $i<$pages; $i++) {
321	$this->list_records(null, $i, true);
322	while ($row = $this->result->next()) {
323	$id = $row[$this->primary_key];
324	$found = 0;
325	foreach (preg_grep($regexp, array_keys($row)) as $col) {
326	$pos = strpos($col, ':');
327	$colname = $pos ? substr($col, 0, $pos) : $col;
328	$search = $post_search[$colname];
329	foreach ((array)$row[$col] as $value) {
330	// composite field, e.g. address
331	if (is_array($value)) {
332	$value = implode($value);
333	}
334	if (($strict && $value == $search)
335	\|\| (!$strict && strpos(mb_strtolower($value), $search) !== false)
336	) {
337	$found++;
338	break;
339	}
340	}
341	}
342	// all fields match
343	if ($found == $scnt) {
344	$ids[] = $id;
345	}
346	}
347	}
348
349	// build WHERE clause
350	$ids = $this->db->array2list($ids, 'integer');
351	$where = 'c.' . $this->primary_key.' IN ('.$ids.')';
352	unset($this->cache['count']);
353	}
354
355	if (!empty($where)) {
356	$this->set_search_set($where);
357	if ($select)
358	$this->list_records(null, 0, $nocount);
359	else
360	$this->result = $this->count();
361	}
362
363	return $this->result;
364	}
365
366
367	/**
368	* Count number of available contacts in database
369	*
370	* @return rcube_result_set Result object
371	*/
372	function count()
373	{
374	$count = isset($this->cache['count']) ? $this->cache['count'] : $this->_count();
375
376	return new rcube_result_set($count, ($this->list_page-1) * $this->page_size);
377	}
378
379
380	/**
381	* Count number of available contacts in database
382	*
383	* @return int Contacts count
384	*/
385	private function _count()
386	{
387	if ($this->group_id)
388	$join = " LEFT JOIN ".get_table_name($this->db_groupmembers)." AS m".
389	" ON (m.contact_id=c.".$this->primary_key.")";
390
391	// count contacts for this user
392	$sql_result = $this->db->query(
393	"SELECT COUNT(c.contact_id) AS rows".
394	" FROM ".get_table_name($this->db_name)." AS c".
395	$join.
396	" WHERE c.del<>1".
397	" AND c.user_id=?".
398	($this->group_id ? " AND m.contactgroup_id=?" : "").
399	($this->filter ? " AND (".$this->filter.")" : ""),
400	$this->user_id,
401	$this->group_id
402	);
403
404	$sql_arr = $this->db->fetch_assoc($sql_result);
405
406	$this->cache['count'] = (int) $sql_arr['rows'];
407
408	return $this->cache['count'];
409	}
410
411
412	/**
413	* Return the last result set
414	*
415	* @return mixed Result array or NULL if nothing selected yet
416	*/
417	function get_result()
418	{
419	return $this->result;
420	}
421
422
423	/**
424	* Get a specific contact record
425	*
426	* @param mixed record identifier(s)
427	* @return mixed Result object with all record fields or False if not found
428	*/
429	function get_record($id, $assoc=false)
430	{
431	// return cached result
432	if ($this->result && ($first = $this->result->first()) && $first[$this->primary_key] == $id)
433	return $assoc ? $first : $this->result;
434
435	$this->db->query(
436	"SELECT * FROM ".get_table_name($this->db_name).
437	" WHERE contact_id=?".
438	" AND user_id=?".
439	" AND del<>1",
440	$id,
441	$this->user_id
442	);
443
444	if ($sql_arr = $this->db->fetch_assoc()) {
445	$record = $this->convert_db_data($sql_arr);
446	$this->result = new rcube_result_set(1);
447	$this->result->add($record);
448	}
449
450	return $assoc && $record ? $record : $this->result;
451	}
452
453
454	/**
455	* Get group assignments of a specific contact record
456	*
457	* @param mixed Record identifier
458	* @return array List of assigned groups as ID=>Name pairs
459	*/
460	function get_record_groups($id)
461	{
462	$results = array();
463
464	if (!$this->groups)
465	return $results;
466
467	$sql_result = $this->db->query(
468	"SELECT cgm.contactgroup_id, cg.name FROM " . get_table_name($this->db_groupmembers) . " AS cgm" .
469	" LEFT JOIN " . get_table_name($this->db_groups) . " AS cg ON (cgm.contactgroup_id = cg.contactgroup_id AND cg.del<>1)" .
470	" WHERE cgm.contact_id=?",
471	$id
472	);
473	while ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
474	$results[$sql_arr['contactgroup_id']] = $sql_arr['name'];
475	}
476
477	return $results;
478	}
479
480
481	/**
482	* Check the given data before saving.
483	* If input not valid, the message to display can be fetched using get_error()
484	*
485	* @param array Assoziative array with data to save
486	* @return boolean True if input is valid, False if not.
487	*/
488	public function validate($save_data)
489	{
490	// validate e-mail addresses
491	$valid = parent::validate($save_data);
492
493	// require at least one e-mail address (syntax check is already done)
494	if ($valid && !array_filter($this->get_col_values('email', $save_data, true))) {
495	$this->set_error('warning', 'noemailwarning');
496	$valid = false;
497	}
498
499	return $valid;
500	}
501
502
503	/**
504	* Create a new contact record
505	*
506	* @param array Associative array with save data
507	* @return integer\|boolean The created record ID on success, False on error
508	*/
509	function insert($save_data, $check=false)
510	{
511	if (!is_array($save_data))
512	return false;
513
514	$insert_id = $existing = false;
515
516	if ($check) {
517	foreach ($save_data as $col => $values) {
518	if (strpos($col, 'email') === 0) {
519	foreach ((array)$values as $email) {
520	if ($existing = $this->search('email', $email, false, false))
521	break 2;
522	}
523	}
524	}
525	}
526
527	$save_data = $this->convert_save_data($save_data);
528	$a_insert_cols = $a_insert_values = array();
529
530	foreach ($save_data as $col => $value) {
531	$a_insert_cols[] = $this->db->quoteIdentifier($col);
532	$a_insert_values[] = $this->db->quote($value);
533	}
534
535	if (!$existing->count && !empty($a_insert_cols)) {
536	$this->db->query(
537	"INSERT INTO ".get_table_name($this->db_name).
538	" (user_id, changed, del, ".join(', ', $a_insert_cols).")".
539	" VALUES (".intval($this->user_id).", ".$this->db->now().", 0, ".join(', ', $a_insert_values).")"
540	);
541
542	$insert_id = $this->db->insert_id($this->db_name);
543	}
544
545	// also add the newly created contact to the active group
546	if ($insert_id && $this->group_id)
547	$this->add_to_group($this->group_id, $insert_id);
548
549	$this->cache = null;
550
551	return $insert_id;
552	}
553
554
555	/**
556	* Update a specific contact record
557	*
558	* @param mixed Record identifier
559	* @param array Assoziative array with save data
560	* @return boolean True on success, False on error
561	*/
562	function update($id, $save_cols)
563	{
564	$updated = false;
565	$write_sql = array();
566	$record = $this->get_record($id, true);
567	$save_cols = $this->convert_save_data($save_cols, $record);
568
569	foreach ($save_cols as $col => $value) {
570	$write_sql[] = sprintf("%s=%s", $this->db->quoteIdentifier($col), $this->db->quote($value));
571	}
572
573	if (!empty($write_sql)) {
574	$this->db->query(
575	"UPDATE ".get_table_name($this->db_name).
576	" SET changed=".$this->db->now().", ".join(', ', $write_sql).
577	" WHERE contact_id=?".
578	" AND user_id=?".
579	" AND del<>1",
580	$id,
581	$this->user_id
582	);
583
584	$updated = $this->db->affected_rows();
585	$this->result = null; // clear current result (from get_record())
586	}
587
588	return $updated;
589	}
590
591
592	private function convert_db_data($sql_arr)
593	{
594	$record = array();
595	$record['ID'] = $sql_arr[$this->primary_key];
596
597	if ($sql_arr['vcard']) {
598	unset($sql_arr['email']);
599	$vcard = new rcube_vcard($sql_arr['vcard']);
600	$record += $vcard->get_assoc() + $sql_arr;
601	}
602	else {
603	$record += $sql_arr;
604	$record['email'] = preg_split('/,\s*/', $record['email']);
605	}
606
607	return $record;
608	}
609
610
611	private function convert_save_data($save_data, $record = array())
612	{
613	$out = array();
614	$words = '';
615
616	// copy values into vcard object
617	$vcard = new rcube_vcard($record['vcard'] ? $record['vcard'] : $save_data['vcard']);
618	$vcard->reset();
619	foreach ($save_data as $key => $values) {
620	list($field, $section) = explode(':', $key);
621	$fulltext = in_array($field, $this->fulltext_cols);
622	foreach ((array)$values as $value) {
623	if (isset($value))
624	$vcard->set($field, $value, $section);
625	if ($fulltext && is_array($value))
626	$words .= ' ' . self::normalize_string(join(" ", $value));
627	else if ($fulltext && strlen($value) >= 3)
628	$words .= ' ' . self::normalize_string($value);
629	}
630	}
631	$out['vcard'] = $vcard->export(false);
632
633	foreach ($this->table_cols as $col) {
634	$key = $col;
635	if (!isset($save_data[$key]))
636	$key .= ':home';
637	if (isset($save_data[$key]))
638	$out[$col] = is_array($save_data[$key]) ? join(',', $save_data[$key]) : $save_data[$key];
639	}
640
641	// save all e-mails in database column
642	$out['email'] = join(", ", $vcard->email);
643
644	// join words for fulltext search
645	$out['words'] = join(" ", array_unique(explode(" ", $words)));
646
647	return $out;
648	}
649
650
651	/**
652	* Mark one or more contact records as deleted
653	*
654	* @param array Record identifiers
655	*/
656	function delete($ids)
657	{
658	if (!is_array($ids))
659	$ids = explode(',', $ids);
660
661	$ids = $this->db->array2list($ids, 'integer');
662
663	// flag record as deleted
664	$this->db->query(
665	"UPDATE ".get_table_name($this->db_name).
666	" SET del=1, changed=".$this->db->now().
667	" WHERE user_id=?".
668	" AND contact_id IN ($ids)",
669	$this->user_id
670	);
671
672	$this->cache = null;
673
674	return $this->db->affected_rows();
675	}
676
677
678	/**
679	* Remove all records from the database
680	*/
681	function delete_all()
682	{
683	$this->db->query("DELETE FROM ".get_table_name($this->db_name)." WHERE user_id = ?", $this->user_id);
684	$this->cache = null;
685	return $this->db->affected_rows();
686	}
687
688
689	/**
690	* Create a contact group with the given name
691	*
692	* @param string The group name
693	* @return mixed False on error, array with record props in success
694	*/
695	function create_group($name)
696	{
697	$result = false;
698
699	// make sure we have a unique name
700	$name = $this->unique_groupname($name);
701
702	$this->db->query(
703	"INSERT INTO ".get_table_name($this->db_groups).
704	" (user_id, changed, name)".
705	" VALUES (".intval($this->user_id).", ".$this->db->now().", ".$this->db->quote($name).")"
706	);
707
708	if ($insert_id = $this->db->insert_id($this->db_groups))
709	$result = array('id' => $insert_id, 'name' => $name);
710
711	return $result;
712	}
713
714
715	/**
716	* Delete the given group (and all linked group members)
717	*
718	* @param string Group identifier
719	* @return boolean True on success, false if no data was changed
720	*/
721	function delete_group($gid)
722	{
723	// flag group record as deleted
724	$sql_result = $this->db->query(
725	"UPDATE ".get_table_name($this->db_groups).
726	" SET del=1, changed=".$this->db->now().
727	" WHERE contactgroup_id=?",
728	$gid
729	);
730
731	$this->cache = null;
732
733	return $this->db->affected_rows();
734	}
735
736
737	/**
738	* Rename a specific contact group
739	*
740	* @param string Group identifier
741	* @param string New name to set for this group
742	* @return boolean New name on success, false if no data was changed
743	*/
744	function rename_group($gid, $newname)
745	{
746	// make sure we have a unique name
747	$name = $this->unique_groupname($newname);
748
749	$sql_result = $this->db->query(
750	"UPDATE ".get_table_name($this->db_groups).
751	" SET name=?, changed=".$this->db->now().
752	" WHERE contactgroup_id=?",
753	$name, $gid
754	);
755
756	return $this->db->affected_rows() ? $name : false;
757	}
758
759
760	/**
761	* Add the given contact records the a certain group
762	*
763	* @param string Group identifier
764	* @param array List of contact identifiers to be added
765	* @return int Number of contacts added
766	*/
767	function add_to_group($group_id, $ids)
768	{
769	if (!is_array($ids))
770	$ids = explode(',', $ids);
771
772	$added = 0;
773	$exists = array();
774
775	// get existing assignments ...
776	$sql_result = $this->db->query(
777	"SELECT contact_id FROM ".get_table_name($this->db_groupmembers).
778	" WHERE contactgroup_id=?".
779	" AND contact_id IN (".$this->db->array2list($ids, 'integer').")",
780	$group_id
781	);
782	while ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
783	$exists[] = $sql_arr['contact_id'];
784	}
785	// ... and remove them from the list
786	$ids = array_diff($ids, $exists);
787
788	foreach ($ids as $contact_id) {
789	$this->db->query(
790	"INSERT INTO ".get_table_name($this->db_groupmembers).
791	" (contactgroup_id, contact_id, created)".
792	" VALUES (?, ?, ".$this->db->now().")",
793	$group_id,
794	$contact_id
795	);
796
797	if (!$this->db->db_error)
798	$added++;
799	}
800
801	return $added;
802	}
803
804
805	/**
806	* Remove the given contact records from a certain group
807	*
808	* @param string Group identifier
809	* @param array List of contact identifiers to be removed
810	* @return int Number of deleted group members
811	*/
812	function remove_from_group($group_id, $ids)
813	{
814	if (!is_array($ids))
815	$ids = explode(',', $ids);
816
817	$ids = $this->db->array2list($ids, 'integer');
818
819	$sql_result = $this->db->query(
820	"DELETE FROM ".get_table_name($this->db_groupmembers).
821	" WHERE contactgroup_id=?".
822	" AND contact_id IN ($ids)",
823	$group_id
824	);
825
826	return $this->db->affected_rows();
827	}
828
829
830	/**
831	* Check for existing groups with the same name
832	*
833	* @param string Name to check
834	* @return string A group name which is unique for the current use
835	*/
836	private function unique_groupname($name)
837	{
838	$checkname = $name;
839	$num = 2; $hit = false;
840
841	do {
842	$sql_result = $this->db->query(
843	"SELECT 1 FROM ".get_table_name($this->db_groups).
844	" WHERE del<>1".
845	" AND user_id=?".
846	" AND name=?",
847	$this->user_id,
848	$checkname);
849
850	// append number to make name unique
851	if ($hit = $this->db->num_rows($sql_result))
852	$checkname = $name . ' ' . $num++;
853	} while ($hit > 0);
854
855	return $checkname;
856	}
857
858	}

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