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-rw-r--r--admin/include/functions.php48
1 files changed, 48 insertions, 0 deletions
diff --git a/admin/include/functions.php b/admin/include/functions.php
index 6ad6bc7fe..91931cf4d 100644
--- a/admin/include/functions.php
+++ b/admin/include/functions.php
@@ -364,6 +364,54 @@ DELETE FROM '.USERS_TABLE.'
}
/**
+ * Deletes all tags linked to no photo
+ */
+function delete_orphan_tags()
+{
+ $orphan_tags = get_orphan_tags();
+
+ if (count($orphan_tags) > 0)
+ {
+ $orphan_tag_ids = array();
+ foreach ($orphan_tags as $tag)
+ {
+ array_push($orphan_tag_ids, $tag['id']);
+ }
+
+ $query = '
+DELETE
+ FROM '.TAGS_TABLE.'
+ WHERE id IN ('.implode(',', $orphan_tag_ids).')
+;';
+ pwg_query($query);
+ }
+}
+
+/**
+ * Get all tags (id + name) linked to no photo
+ */
+function get_orphan_tags()
+{
+ $orphan_tags = array();
+
+ $query = '
+SELECT
+ id,
+ name
+ FROM '.TAGS_TABLE.'
+ LEFT JOIN '.IMAGE_TAG_TABLE.' ON id = tag_id
+ WHERE tag_id IS NULL
+;';
+ $result = pwg_query($query);
+ while ($row = pwg_db_fetch_assoc($result))
+ {
+ array_push($orphan_tags, $row);
+ }
+
+ return $orphan_tags;
+}
+
+/**
* Verifies that the representative picture really exists in the db and
* picks up a random represantive if possible and based on config.
*