connect(); class Test extends msmeDb { public function insertData($post) { $sql_insert="INSERT INTO test(name,phone,email) VALUES(:name,:phone, :email)"; // $result = $pdo->prepare($sql_insert); $result = $this->connect()->prepare($sql_insert); $result->execute( [ 'name' => $_POST['name'], 'phone' => $_POST['phone'], 'email' => $_POST['email'], ] ); } }