* @param bool $dropCurrentTables
*/
public function __construct( IMaintainableDatabase $db, array $tablesToClone,
- $newTablePrefix, $oldTablePrefix = '', $dropCurrentTables = true
+ $newTablePrefix, $oldTablePrefix = null, $dropCurrentTables = true
) {
$this->db = $db;
$this->tablesToClone = $tablesToClone;
$this->newTablePrefix = $newTablePrefix;
- $this->oldTablePrefix = $oldTablePrefix ? $oldTablePrefix : $this->db->tablePrefix();
+ $this->oldTablePrefix = $oldTablePrefix !== null ? $oldTablePrefix : $this->db->tablePrefix();
$this->dropCurrentTables = $dropCurrentTables;
}