Add function to check if a time name is blacklisted

src/NodaBlacklistedTerms.php

@@ -122,4 +122,31 @@ final class NodaBlacklistedTerms {
         return true;
 
     }
+
+    /**
+     * Checks if a time name is blacklisted in the DB.
+     *
+     * @param MDMysqli $mysqli DB connection.
+     * @param string   $lang   The user's currently used language.
+     * @param string   $name   The name entered by the user.
+     *
+     * @return boolean
+     */
+    public static function checkTimeBlacklistedInDb(MDMysqli $mysqli, string $lang, string $name):bool {
+
+        $result = $mysqli->query_by_stmt("SELECT 1
+            FROM `" . DATABASENAME_NODA . "`.`zeiten_blacklist`
+            WHERE `language` = ?
+                AND `zeit_name` = ?
+            LIMIT 1", "ss", $lang, $name);
+
+        if ($result->num_rows === 0) {
+            $result->close();
+            return false;
+        }
+
+        $result->close();
+        return true;
+
+    }
 }