exec("SET FOREIGN_KEY_CHECKS=0;"); $sql = <<exec($sql); $sql_update = <<exec($sql_update); $sql_alter = <<exec($sql_alter); $sql_fk = <<exec($sql_fk); $pdo->exec("SET FOREIGN_KEY_CHECKS=1;"); echo "Table 'orders' updated successfully." . PHP_EOL; } catch (PDOException $e) { die("DB ERROR: " . $e->getMessage()); }