blog/lib.php

   1 <?php //$Id$
   2
   3     /**
   4      * Library of functions and constants for blog
   5      */
   6     require_once($CFG->libdir .'/blocklib.php');
   7     require_once($CFG->libdir .'/pagelib.php');
   8     require_once($CFG->dirroot .'/blog/rsslib.php');
   9     require_once($CFG->dirroot .'/blog/blogpage.php');
  10     require_once($CFG->dirroot.'/tag/lib.php');
  11
  12     /**
  13      * Definition of blogcourse page type (blog page with course id present).
  14      */
  15     //not used at the moment, and may not need to be
  16     define('PAGE_BLOG_COURSE_VIEW', 'blog_course-view');
  17
  18
  19     /**
  20      * Checks to see if user has visited blogpages before, if not, install 2
  21      * default blocks (blog_menu and blog_tags).
  22      */
  23     function blog_check_and_install_blocks() {
  24         global $USER;
  25         if (isloggedin() && !isguest()) {
  26             // if this user has not visited this page before
  27             if (!get_user_preferences('blogpagesize')) {
  28                 // find the correct ids for blog_menu and blog_from blocks
  29                 $menublock = get_record('block','name','blog_menu');
  30                 $tagsblock = get_record('block','name','blog_tags');
  31                 // add those 2 into block_instance page
  32
  33                 // add blog_menu block
  34                 $newblock = new object();
  35                 $newblock->blockid  = $menublock->id;
  36                 $newblock->pageid   = $USER->id;
  37                 $newblock->pagetype = 'blog-view';
  38                 $newblock->position = 'r';
  39                 $newblock->weight   = 0;
  40                 $newblock->visible  = 1;
  41                 insert_record('block_instance', $newblock);
  42
  43                 // add blog_tags menu
  44                 $newblock -> blockid = $tagsblock->id;
  45                 $newblock -> weight  = 1;
  46                 insert_record('block_instance', $newblock);
  47
  48                 // finally we set the page size pref
  49                 set_user_preference('blogpagesize', 10);
  50             }
  51         }
  52     }
  53
  54
  55     /**
  56      * Adaptation of isediting in moodlelib.php for blog module
  57      * @return bool
  58      */
  59     function blog_isediting() {
  60         global $SESSION;
  61
  62         return !empty($SESSION->blog_editing_enabled);
  63     }
  64
  65
  66     /**
  67      *  This function is in lib and not in BlogInfo because entries being searched
  68      *   might be found in any number of blogs rather than just one.
  69      *
  70      *   $@param ...
  71      */
  72     function blog_print_html_formatted_entries($postid, $filtertype, $filterselect, $tagid, $tag) {
  73
  74         global $CFG, $USER;
  75
  76         $blogpage  = optional_param('blogpage', 0, PARAM_INT);
  77         $bloglimit = optional_param('limit', get_user_preferences('blogpagesize', 10), PARAM_INT);
  78         $start     = $blogpage * $bloglimit;
  79
  80         $sitecontext = get_context_instance(CONTEXT_SYSTEM);
  81
  82         $morelink = '<br />&nbsp;&nbsp;';
  83
  84         $totalentries = get_viewable_entry_count($postid, $bloglimit, $start, $filtertype, $filterselect, $tagid, $tag, $sort='created DESC');
  85         $blogEntries = blog_fetch_entries($postid, $bloglimit, $start, $filtertype, $filterselect, $tagid, $tag, $sort='created DESC', true);
  86
  87         print_paging_bar($totalentries, $blogpage, $bloglimit, get_baseurl($filtertype, $filterselect), 'blogpage');
  88
  89         if ($CFG->enablerssfeeds) {
  90             blog_rss_print_link($filtertype, $filterselect, $tag);
  91         }
  92
  93         if (has_capability('moodle/blog:create', $sitecontext)) {
  94             //the user's blog is enabled and they are viewing their own blog
  95             $addlink = '<div class="addbloglink">';
  96             $addlink .= '<a href="'.$CFG->wwwroot .'/blog/edit.php?action=add'.'">'. get_string('addnewentry', 'blog').'</a>';
  97             $addlink .= '</div>';
  98             echo $addlink;
  99         }
 100
 101         if ($blogEntries) {
 102
 103             $count = 0;
 104             foreach ($blogEntries as $blogEntry) {
 105                 blog_print_entry($blogEntry, 'list', $filtertype, $filterselect); //print this entry.
 106                 $count++;
 107             }
 108
 109             print_paging_bar($totalentries, $blogpage, $bloglimit, get_baseurl($filtertype, $filterselect), 'blogpage');
 110
 111             if (!$count) {
 112                 print '<br /><div style="text-align:center">'. get_string('noentriesyet', 'blog') .'</div><br />';
 113
 114             }
 115
 116             print $morelink.'<br />'."\n";
 117             return;
 118         }
 119
 120         $output = '<br /><div style="text-align:center">'. get_string('noentriesyet', 'blog') .'</div><br />';
 121
 122         print $output;
 123
 124     }
 125
 126
 127     /**
 128      * This function is in lib and not in BlogInfo because entries being searched
 129      * might be found in any number of blogs rather than just one.
 130      *
 131      * This function builds an array which can be used by the included
 132      * template file, making predefined and nicely formatted variables available
 133      * to the template. Template creators will not need to become intimate
 134      * with the internal objects and vars of moodle blog nor will they need to worry
 135      * about properly formatting their data
 136      *
 137      *   @param BlogEntry blogEntry - a hopefully fully populated BlogEntry object
 138      *   @param string viewtype Default is 'full'. If 'full' then display this blog entry
 139      *     in its complete form (eg. archive page). If anything other than 'full'
 140      *     display the entry in its abbreviated format (eg. index page)
 141      */
 142     function blog_print_entry($blogEntry, $viewtype='full', $filtertype='', $filterselect='', $mode='loud') {
 143
 144         global $USER, $CFG, $COURSE, $ME;
 145
 146         $template['body'] = format_text($blogEntry->summary, $blogEntry->format);
 147         $template['title'] = '<a id=b"'. s($blogEntry->id) .' /">';
 148         //enclose the title in nolink tags so that moodle formatting doesn't autolink the text
 149         $template['title'] .= '<span class="nolink">'. format_string($blogEntry->subject) .'</span>';
 150         $template['userid'] = $blogEntry->userid;
 151         $template['author'] = fullname(get_record('user','id',$blogEntry->userid));
 152         $template['created'] = userdate($blogEntry->created);
 153
 154         if($blogEntry->created != $blogEntry->lastmodified){
 155             $template['lastmod'] = userdate($blogEntry->lastmodified);
 156         }
 157
 158         $template['publishstate'] = $blogEntry->publishstate;
 159
 160         /// preventing user to browse blogs that they aren't supposed to see
 161         /// This might not be too good since there are multiple calls per page
 162
 163         /*
 164         if (!blog_user_can_view_user_post($template['userid'])) {
 165             error ('you can not view this post');
 166         }*/
 167
 168         $stredit = get_string('edit');
 169         $strdelete = get_string('delete');
 170
 171         $user = get_record('user','id',$template['userid']);
 172
 173         /// Start printing of the blog
 174
 175         echo '<table cellspacing="0" class="forumpost blogpost blog'.$template['publishstate'].'" width="100%">';
 176
 177         echo '<tr class="header"><td class="picture left">';
 178         print_user_picture($user, SITEID, $user->picture);
 179         echo '</td>';
 180
 181         echo '<td class="topic starter"><div class="subject">'.$template['title'].'</div><div class="author">';
 182         $fullname = fullname($user, has_capability('moodle/site:viewfullnames', get_context_instance(CONTEXT_COURSE, $COURSE->id)));
 183         $by = new object();
 184         $by->name =  '<a href="'.$CFG->wwwroot.'/user/view.php?id='.
 185                     $user->id.'&amp;course='.$COURSE->id.'">'.$fullname.'</a>';
 186         $by->date = $template['created'];
 187         print_string('bynameondate', 'forum', $by);
 188         echo '</div></td></tr>';
 189
 190         echo '<tr><td class="left side">';
 191
 192     /// Actual content
 193
 194         echo '</td><td class="content">'."\n";
 195
 196         if ($blogEntry->attachment) {
 197             echo '<div class="attachments">';
 198             $attachedimages = blog_print_attachments($blogEntry);
 199             echo '</div>';
 200         } else {
 201             $attachedimages = '';
 202         }
 203
 204         switch ($template['publishstate']) {
 205             case 'draft':
 206                 $blogtype = get_string('publishtonoone', 'blog');
 207             break;
 208             case 'site':
 209                 $blogtype = get_string('publishtosite', 'blog');
 210             break;
 211             case 'public':
 212                 $blogtype = get_string('publishtoworld', 'blog');
 213             break;
 214             default:
 215                 $blogtype = '';
 216             break;
 217
 218         }
 219
 220         echo '<div class="audience">'.$blogtype.'</div>';
 221
 222         // Print whole message
 223         echo $template['body'];
 224
 225         /// Print attachments
 226         echo $attachedimages;
 227     /// Links to tags
 228
 229         if ( !empty($CFG->usetags) && ($blogtags = tag_get_tags_csv('post', $blogEntry->id)) ) {
 230             echo '<div class="tags">';
 231             if ($blogtags) {
 232                 print(get_string('tags', 'tag') .': '. $blogtags);
 233            }
 234             echo '</div>';
 235         }
 236
 237     /// Commands
 238
 239         echo '<div class="commands">';
 240
 241         if (blog_user_can_edit_post($blogEntry)) {
 242             echo '<a href="'.$CFG->wwwroot.'/blog/edit.php?action=edit&amp;id='.$blogEntry->id.'">'.$stredit.'</a>';
 243             echo '| <a href="'.$CFG->wwwroot.'/blog/edit.php?action=delete&amp;id='.$blogEntry->id.'">'.$strdelete.'</a> | ';
 244         }
 245
 246         echo '<a href="'.$CFG->wwwroot.'/blog/index.php?postid='.$blogEntry->id.'">'.get_string('permalink', 'blog').'</a>';
 247
 248         echo '</div>';
 249
 250         if( isset($template['lastmod']) ){
 251             echo '<div style="font-size: 55%;">';
 252             echo ' [ '.get_string('modified').': '.$template['lastmod'].' ]';
 253             echo '</div>';
 254         }
 255
 256         echo '</td></tr></table>'."\n\n";
 257
 258     }
 259
 260     function blog_file_area_name($blogentry) {
 261     //  Creates a directory file name, suitable for make_upload_directory()
 262         global $CFG;
 263         // $CFG->dataroot/blog/attachments/xxxx/file.jpg
 264         return "blog/attachments/$blogentry->id";
 265     }
 266
 267     function blog_file_area($blogentry) {
 268         return make_upload_directory( blog_file_area_name($blogentry) );
 269     }
 270
 271     function blog_delete_old_attachments($post, $exception="") {
 272     // Deletes all the user files in the attachments area for a post
 273     // EXCEPT for any file named $exception
 274
 275         if ($basedir = blog_file_area($post)) {
 276             if ($files = get_directory_list($basedir)) {
 277                 foreach ($files as $file) {
 278                     if ($file != $exception) {
 279                         unlink("$basedir/$file");
 280                         notify("Existing file '$file' has been deleted!");
 281                     }
 282                 }
 283             }
 284             if (!$exception) {  // Delete directory as well, if empty
 285                 rmdir("$basedir");
 286             }
 287         }
 288     }
 289
 290     function blog_print_attachments($blogentry, $return=NULL) {
 291     // if return=html, then return a html string.
 292     // if return=text, then return a text-only string.
 293     // otherwise, print HTML for non-images, and return image HTML
 294
 295         global $CFG;
 296
 297         $filearea = blog_file_area_name($blogentry);
 298
 299         $imagereturn = "";
 300         $output = "";
 301
 302         if ($basedir = blog_file_area($blogentry)) {
 303             if ($files = get_directory_list($basedir)) {
 304                 $strattachment = get_string("attachment", "forum");
 305                 foreach ($files as $file) {
 306                     include_once($CFG->libdir.'/filelib.php');
 307                     $icon = mimeinfo("icon", $file);
 308                     $type = mimeinfo("type", $file);
 309                     $ffurl = get_file_url("$filearea/$file");
 310                     $image = "<img src=\"$CFG->pixpath/f/$icon\" class=\"icon\" alt=\"\" />";
 311
 312                     if ($return == "html") {
 313                         $output .= "<a href=\"$ffurl\">$image</a> ";
 314                         $output .= "<a href=\"$ffurl\">$file</a><br />";
 315
 316                     } else if ($return == "text") {
 317                         $output .= "$strattachment $file:\n$ffurl\n";
 318
 319                     } else {
 320                         if (in_array($type, array('image/gif', 'image/jpeg', 'image/png'))) {    // Image attachments don't get printed as links
 321                             $imagereturn .= "<br /><img src=\"$ffurl\" alt=\"\" />";
 322                         } else {
 323                             echo "<a href=\"$ffurl\">$image</a> ";
 324                             echo filter_text("<a href=\"$ffurl\">$file</a><br />");
 325                         }
 326                     }
 327                 }
 328             }
 329         }
 330
 331         if ($return) {
 332             return $output;
 333         }
 334
 335         return $imagereturn;
 336     }
 337
 338
 339     /**
 340      * Use this function to retrieve a list of publish states available for
 341      * the currently logged in user.
 342      *
 343      * @return array This function returns an array ideal for sending to moodles'
 344      *                choose_from_menu function.
 345      */
 346     function blog_applicable_publish_states($courseid='') {
 347
 348         global $CFG;
 349
 350         // everyone gets draft access
 351         if ($CFG->bloglevel >= BLOG_USER_LEVEL) {
 352             $options = array ( 'draft' => get_string('publishtonoone', 'blog') );
 353         }
 354
 355         if ($CFG->bloglevel > BLOG_USER_LEVEL) {
 356             $options['site'] = get_string('publishtosite', 'blog');
 357         }
 358
 359         if ($CFG->bloglevel >= BLOG_GLOBAL_LEVEL) {
 360             $options['public'] = get_string('publishtoworld', 'blog');
 361         }
 362
 363         return $options;
 364     }
 365
 366
 367     /**
 368      * User can edit a blog entry if this is their own blog post and they have
 369      * the capability moodle/blog:create, or if they have the capability
 370      * moodle/blog:manageentries.
 371      *
 372      * This also applies to deleting of posts.
 373      */
 374     function blog_user_can_edit_post($blogEntry) {
 375
 376         global $CFG, $USER;
 377
 378         $sitecontext = get_context_instance(CONTEXT_SYSTEM);
 379
 380         if (has_capability('moodle/blog:manageentries', $sitecontext)) {
 381             return true; // can edit any blog post
 382         }
 383
 384         if ($blogEntry->userid == $USER->id
 385           and has_capability('moodle/blog:create', $sitecontext)) {
 386             return true; // can edit own when having blog:create capability
 387         }
 388
 389         return false;
 390     }
 391
 392
 393     /**
 394      * Checks to see if a user can view the blogs of another user.
 395      * Only blog level is checked here, the capabilities are enforced
 396      * in blog/index.php
 397      */
 398     function blog_user_can_view_user_post($targetuserid, $blogEntry=null) {
 399         global $CFG, $USER;
 400
 401         if (empty($CFG->bloglevel)) {
 402             return false; // blog system disabled
 403         }
 404
 405         // a hack to publish some blogs openly.  Uses $CFG->openblogs = array(44, 322); in config.php
 406         if (isset($CFG->openblogs) && in_array($targetuserid,$CFG->openblogs)) {
 407             return true;
 408         }
 409
 410         if (!empty($USER->id) and $USER->id == $targetuserid) {
 411             return true; // can view own posts in any case
 412         }
 413
 414         $sitecontext = get_context_instance(CONTEXT_SYSTEM);
 415         if (has_capability('moodle/blog:manageentries', $sitecontext)) {
 416             return true; // can manage all posts
 417         }
 418
 419         // coming for 1 post, make sure it's not a draft
 420         if ($blogEntry and $blogEntry->publishstate == 'draft') {
 421             return false;  // can not view draft of others
 422         }
 423
 424         // coming for 1 post, make sure user is logged in, if not a public blog
 425         if ($blogEntry && $blogEntry->publishstate != 'public' && !isloggedin()) {
 426             return false;
 427         }
 428
 429         switch ($CFG->bloglevel) {
 430             case BLOG_GLOBAL_LEVEL:
 431                 return true;
 432             break;
 433
 434             case BLOG_SITE_LEVEL:
 435                 if (!empty($USER->id)) { // not logged in viewers forbidden
 436                     return true;
 437                 }
 438                 return false;
 439             break;
 440
 441             case BLOG_COURSE_LEVEL:
 442                 $mycourses = array_keys(get_my_courses($USER->id));
 443                 $usercourses = array_keys(get_my_courses($targetuserid));
 444                 $shared = array_intersect($mycourses, $usercourses);
 445                 if (!empty($shared)) {
 446                     return true;
 447                 }
 448                 return false;
 449             break;
 450
 451             case BLOG_GROUP_LEVEL:
 452                 $mycourses = array_keys(get_my_courses($USER->id));
 453                 $usercourses = array_keys(get_my_courses($targetuserid));
 454                 $shared = array_intersect($mycourses, $usercourses);
 455                 foreach ($shared as $courseid) {
 456                     $course = get_record('course', 'id', $courseid);
 457                     $coursecontext = get_context_instance(CONTEXT_COURSE, $courseid);
 458                     if (has_capability('moodle/site:accessallgroups', $coursecontext)
 459                       or groups_get_course_groupmode($course) != SEPARATEGROUPS) {
 460                         return true;
 461                     } else {
 462                         if ($usergroups = groups_get_all_groups($courseid, $targetuserid)) {
 463                             foreach ($usergroups as $usergroup) {
 464                                 if (groups_is_member($usergroup->id)) {
 465                                     return true;
 466                                 }
 467                             }
 468                         }
 469                     }
 470                 }
 471                 return false;
 472             break;
 473
 474             case BLOG_USER_LEVEL:
 475             default:
 476                 $personalcontext = get_context_instance(CONTEXT_USER, $targetuserid);
 477                 return has_capability('moodle/user:readuserblogs', $personalcontext);
 478             break;
 479
 480         }
 481     }
 482
 483
 484     /**
 485      * Main filter function.
 486      */
 487     function blog_fetch_entries($postid='', $fetchlimit=10, $fetchstart='', $filtertype='', $filterselect='', $tagid='', $tag ='', $sort='lastmodified DESC', $limit=true) {
 488
 489         global $CFG, $USER;
 490
 491         /// the post table will be used for other things too
 492         $typesql = " AND p.module = 'blog' ";
 493
 494         /// set the tag id for searching
 495         if ($tagid) {
 496             $tag = $tagid;
 497         } else if ($tag) {
 498             if ($tagrec = get_record_sql('SELECT * FROM '.$CFG->prefix.'tag WHERE name LIKE "'.addslashes($tag).'"')) {
 499                 $tag = $tagrec->id;
 500             } else {
 501                 $tag = -1;    //no records found
 502             }
 503         }
 504
 505         // If we have specified an ID
 506         // Just return 1 entry
 507
 508         if ($postid) {
 509
 510             if ($post = get_record('post', 'id', $postid)) {
 511
 512                 if (blog_user_can_view_user_post($post->userid, $post)) {
 513
 514                     if ($user = get_record('user', 'id', $post->userid)) {
 515                         $post->email = $user->email;
 516                         $post->firstname = $user->firstname;
 517                         $post->lastname = $user->lastname;
 518                     }
 519                     $retarray[] = $post;
 520                     return $retarray;
 521                 } else {
 522                     return null;
 523                 }
 524
 525             } else { // bad postid
 526                 return null;
 527             }
 528         }
 529
 530         if ($tag) {
 531             $tagtablesql = $CFG->prefix.'tag_instance ti, ';
 532             $tagquerysql = ' AND ti.itemid = p.id AND ti.tagid = '.$tag.' AND ti.itemtype = \'post\' ';
 533         } else {
 534             $tagtablesql = '';
 535             $tagquerysql = '';
 536         }
 537
 538         if (isloggedin() && !has_capability('moodle/legacy:guest', get_context_instance(CONTEXT_SYSTEM), $USER->id, false)) {
 539             $permissionsql =  'AND (p.publishstate = \'site\' OR p.publishstate = \'public\' OR p.userid = '.$USER->id.')';
 540         } else {
 541             $permissionsql =  'AND p.publishstate = \'public\'';
 542         }
 543
 544         // fix for MDL-9165, use with readuserblogs capability in a user context can read that user's private blogs
 545         // admins can see all blogs regardless of publish states, as described on the help page
 546         if (has_capability('moodle/user:readuserblogs', get_context_instance(CONTEXT_SYSTEM))) {
 547             $permissionsql = '';
 548         } else if ($filtertype=='user' && has_capability('moodle/user:readuserblogs', get_context_instance(CONTEXT_USER, $filterselect))) {
 549             $permissionsql = '';
 550         }
 551         /****************************************
 552          * depending on the type, there are 4   *
 553          * different possible sqls              *
 554          ****************************************/
 555
 556         $requiredfields = 'p.*, u.firstname,u.lastname,u.email';
 557
 558         if ($filtertype == 'course' && $filterselect == SITEID) {  // Really a site
 559             $filtertype = 'site';
 560         }
 561
 562         switch ($filtertype) {
 563
 564             case 'site':
 565
 566                 $SQL = 'SELECT '.$requiredfields.' FROM '.$CFG->prefix.'post p, '.$tagtablesql
 567                         .$CFG->prefix.'user u
 568                         WHERE p.userid = u.id '.$tagquerysql.'
 569                         AND u.deleted = 0
 570                         '.$permissionsql.$typesql;
 571
 572             break;
 573
 574             case 'course':
 575                 // all users with a role assigned
 576                 $context = get_context_instance(CONTEXT_COURSE, $filterselect);
 577
 578                 // MDL-10037, hidden users' blogs should not appear
 579                 if (has_capability('moodle/role:viewhiddenassigns', $context)) {
 580                     $hiddensql = '';
 581                 } else {
 582                     $hiddensql = ' AND ra.hidden = 0 ';
 583                 }
 584
 585                 $SQL = 'SELECT '.$requiredfields.' FROM '.$CFG->prefix.'post p, '.$tagtablesql
 586                         .$CFG->prefix.'role_assignments ra, '.$CFG->prefix.'user u
 587                         WHERE p.userid = ra.userid '.$tagquerysql.'
 588                         AND ra.contextid '.get_related_contexts_string($context).'
 589                         AND u.id = p.userid
 590                         AND u.deleted = 0
 591                         '.$hiddensql.$permissionsql.$typesql;
 592
 593             break;
 594
 595             case 'group':
 596
 597                 $SQL = 'SELECT '.$requiredfields.' FROM '.$CFG->prefix.'post p, '.$tagtablesql
 598                           .$CFG->prefix.'groups_members gm, '.$CFG->prefix.'user u
 599                         WHERE p.userid = gm.userid AND u.id = p.userid '.$tagquerysql.'
 600                           AND gm.groupid = '.$filterselect.'
 601                           AND u.deleted = 0
 602                           '.$permissionsql.$typesql;
 603             break;
 604
 605             case 'user':
 606
 607                 // a hack to publish some blogs openly.  Uses $CFG->openblogs = array(44, 322); in config.php
 608                 if (isset($CFG->openblogs) && in_array($filterselect,$CFG->openblogs)) {
 609                     $permissionsql = ' AND (p.publishstate = \'site\' OR p.publishstate = \'public\') ';
 610                 }
 611
 612                 $SQL = 'SELECT '.$requiredfields.' FROM '.$CFG->prefix.'post p, '.$tagtablesql
 613                         .$CFG->prefix.'user u
 614                         WHERE p.userid = u.id '.$tagquerysql.'
 615                         AND u.id = '.$filterselect.'
 616                         AND u.deleted = 0
 617                         '.$permissionsql.$typesql;
 618             break;
 619         }
 620
 621         $limitfrom = 0;
 622         $limitnum = 0;
 623
 624         if ($fetchstart !== '' && $limit) {
 625             $limitfrom = $fetchstart;
 626             $limitnum = $fetchlimit;
 627         }
 628
 629         $orderby = ' ORDER BY '. $sort .' ';
 630
 631         //global $db; $db->debug = true;
 632         $records = get_records_sql($SQL . $orderby, $limitfrom, $limitnum);
 633         //$db->debug = false;
 634
 635         if (empty($records)) {
 636             return array();
 637         }
 638
 639         return $records;
 640     }
 641
 642
 643     /**
 644      * get the count of viewable entries, easiest way is to count blog_fetch_entries
 645      * this is used for print_paging_bar
 646      * this is not ideal, but because of the UNION in the sql in blog_fetch_entries,
 647      * it is hard to use count_records_sql
 648      */
 649     function get_viewable_entry_count($postid='', $fetchlimit=10,
 650                 $fetchstart='', $filtertype='', $filterselect='', $tagid='',
 651                 $tag ='', $sort='lastmodified DESC') {
 652
 653         $blogEntries = blog_fetch_entries($postid, $fetchlimit,
 654                 $fetchstart, $filtertype, $filterselect, $tagid, $tag,
 655                 $sort='lastmodified DESC', false);
 656
 657         return count($blogEntries);
 658     }
 659
 660
 661     /// Find the base url from $_GET variables, for print_paging_bar
 662     function get_baseurl($filtertype, $filterselect) {
 663
 664         $getcopy  = $_GET;
 665
 666         unset($getcopy['blogpage']);
 667
 668         $strippedurl = strip_querystring(qualified_me());
 669         if(!empty($getcopy)) {
 670             $first = false;
 671             $querystring = '';
 672             foreach($getcopy as $var => $val) {
 673                 if(!$first) {
 674                     $first = true;
 675                     if ($var != 'filterselect' && $var != 'filtertype') {
 676                         $querystring .= '?'.$var.'='.$val;
 677                         $hasparam = true;
 678                     } else {
 679                         $querystring .= '?';
 680                     }
 681                 } else {
 682                     if ($var != 'filterselect' && $var != 'filtertype') {
 683                     $querystring .= '&amp;'.$var.'='.$val;
 684                     $hasparam = true;
 685                     }
 686                 }
 687             }
 688             if (isset($hasparam)) {
 689                 $querystring .= '&amp;';
 690             } else {
 691                 $querystring = '?';
 692             }
 693         } else {
 694             $querystring = '?';
 695         }
 696
 697         return strip_querystring(qualified_me()) . $querystring. 'filtertype='.
 698                 $filtertype.'&amp;filterselect='.$filterselect.'&amp;';
 699
 700     }
 701
 702     /**
 703      * Returns a list of all user ids who have used blogs in the site
 704      * Used in backup of site courses.
 705      */
 706     function blog_get_participants() {
 707
 708         global $CFG;
 709
 710         return get_records_sql("SELECT userid as id
 711                                   FROM {$CFG->prefix}post
 712                                  WHERE module = 'blog'
 713                                    AND courseid = 0");
 714     }
 715 ?>