Block for listing blog tags

blocks/blog_tags/block_blog_tags.php

@@ -0,0 +1,67 @@
+<?PHP //$Id$
+
+class block_blog_tags extends block_base {
+    function init() {
+        $this->title = get_string('blogtags');
+        $this->version = 2006032000;
+    }
+
+    function get_content() {
+
+        global $CFG;
+
+        $timewithin = time() - 7776000; // last 90 days
+        $topentries = 20; // get the 20 most popular tags
+
+
+        if ($this->content !== NULL) {
+            return $this->content;
+        }
+
+        if (empty($this->instance)) {
+            $this->content = '';
+            return $this->content;
+        }
+
+        $this->content = new stdClass;
+        $this->content->text = '';
+        $this->content->footer = '';
+
+
+        /// Get a list of tags
+
+        $sql  = 'SELECT t.*, COUNT(DISTINCT bt.id) as ct ';
+        $sql .= "FROM {$CFG->prefix}tags as t, {$CFG->prefix}blog_tag_instance as bt ";
+        $sql .= 'WHERE t.id = bt.tagid ';
+        $sql .= "AND bt.timemodified > $timewithin ";
+        $sql .= 'GROUP BY bt.tagid ';
+        $sql .= 'ORDER BY ct DESC, t.text ASC ';
+        $sql .= "LIMIT $topentries ";
+
+        $tags = get_records_sql($sql) or array();
+
+        $size = 20; $lasttagcount = -1; $sizecount = 1;
+        foreach ($tags as $tag) {
+            $class = "$tag->type s$size";
+            $link = $CFG->wwwroot.'/blog/index.php?filtertype=site&tagid='.$tag->id;
+
+            $this->content->text .= '<a href="'.$link.'" class="'.$class.'">'.$tag->text.'</a> ';
+
+            /// Set the size class
+            if ($tag->ct != $lasttagcount) {
+                $size -= $sizecount;
+                $lasttagcount = $tag->ct;
+                $sizecount = 1;
+            } else {
+                $sizecount++;
+            }
+        }
+
+        return $this->content;
+    }
+
+    function applicable_formats() {
+        return array('all' => true, 'my' => false);
+    }
+}
+?>