Add script to get highest related tag

src/NodaHierarchyHelper.php

@@ -0,0 +1,56 @@
+<?PHP
+/**
+ * Helper for noda hierarchies.
+ *
+ * @author Joshua Ramon Enslin <joshua@jrenslin.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Class for splitting times.
+ */
+final class NodaHierarchyHelper {
+
+    /**
+     * Finds highest related tag.
+     *
+     * @param MDMysqli          $mysqli_noda DB connection.
+     * @param integer           $tag_id      Tag ID to find in hierarchy.
+     * @param MDMysqliStmt|null $higherStmt  Statement for getting higher IDs from
+     *                                       the hierarchy.
+     *
+     * @return integer
+     */
+    public static function findHighestRelatedTag(MDMysqli $mysqli_noda, int $tag_id, $higherStmt = null):int {
+
+        $builtHigherStmt = false;
+        if (!$higherStmt instanceOf MDMysqliStmt) {
+            $higherStmt = $mysqli_noda->do_prepare("SELECT `tag_mayor_id`
+                FROM `tag_relation`
+                WHERE `tag_relation`.`tag_relation` != 2
+                    AND `tag_menor_id` = ?
+                LIMIT 1");
+            $builtHigherStmt = true;
+        }
+
+        $higherStmt->bind_param("i", $tag_id);
+        $higherStmt->execute();
+
+        $result = $higherStmt->do_get_result();
+        if ($cur = $result->fetch_row()) {
+            $curID = (int)$cur[0];
+            $output = self::findHighestRelatedTag($mysqli_noda, $curID, $higherStmt);
+        }
+        else {
+            $output = $tag_id;
+        }
+
+        if ($builtHigherStmt === true) {
+            $higherStmt->close();
+        }
+
+        return $output;
+
+    }
+
+}