Save several files in zip with php

I have a site that downloads a DB to an excel file and they suggested that I do it with a zip file, so I was thinking about downloading each table in an excel file and putting everything in zip,

this is the code with which I create the excel files:

<?php

$bd123= $_POST["basededatos123"];

            $link = mysqli_connect("", "", "");

            mysqli_select_db($link, "");

            //$tildes = $link->query("SET NAMES 'utf8'"); //Para que se muestren las tildes correctamente

            $result = mysqli_query($link, "SELECT * FROM ".$bd123);
            include ("PHPExcel-1.8/Classes/PHPExcel.php");


            // Se crea el objeto PHPExcel
             $objPHPExcel = new PHPExcel();

             // Se asignan las propiedades del libro
            $objPHPExcel->getProperties()->setCreator("Codedrinks") // Nombre del autor
                ->setLastModifiedBy("Codedrinks") //Ultimo usuario que lo modificó
                ->setTitle("Reporte Excel con PHP y MySQL") // Titulo
                ->setSubject("Reporte Excel con PHP y MySQL") //Asunto
                ->setDescription("Reporte de alumnos") //Descripción
                ->setKeywords("reporte alumnos carreras") //Etiquetas
                ->setCategory("Reporte excel"); //Categorias

             $tituloReporte = "Datos Actualizados Del Usuario";
            $titulosColumnas = array('Nombre', 'Correo', 'Celular', 'Placa', 'Creado');

            // Se combinan las celdas A1 hasta D1, para colocar ahí el titulo del reporte
            $objPHPExcel->setActiveSheetIndex(0)
                ->mergeCells('A1:E1');

            // Se agregan los titulos del reporte
            $objPHPExcel->setActiveSheetIndex(0)
                ->setCellValue('A1',$tituloReporte) // Titulo del reporte
                ->setCellValue('A3',  $titulosColumnas[0])  //Titulo de las columnas
                ->setCellValue('B3',  $titulosColumnas[1])
                ->setCellValue('C3',  $titulosColumnas[2])
                ->setCellValue('D3',  $titulosColumnas[3])
                ->setCellValue('E3',  $titulosColumnas[4]);


                //Se agregan los datos de los alumnos

                $i = 4; //Numero de fila donde se va a comenzar a rellenar
                while ($fila = mysqli_fetch_array($result)){
                     $objPHPExcel->setActiveSheetIndex(0)
                         ->setCellValue('A'.$i, $fila['name'])
                         ->setCellValue('B'.$i, $fila['email'])
                         ->setCellValue('C'.$i, $fila['tel'])
                         ->setCellValue('D'.$i, $fila['plate'])
                         ->setCellValue('E'.$i, $fila['created']);
                     $i++;
                 }

                $estiloTituloReporte = array(
                    'font' => array(
                        'name'      => 'Verdana',
                        'bold'      => true,
                        'italic'    => false,
                        'strike'    => false,
                        'size' =>16,
                        'color'     => array(
                            'rgb' => 'FFFFFF'
                        )
                    ),
                    'fill' => array(
                      'type'  => PHPExcel_Style_Fill::FILL_SOLID,
                      'color' => array(
                            'argb' => '4d3b03')
                  ),
                    'borders' => array(
                        'allborders' => array(
                            'style' => PHPExcel_Style_Border::BORDER_NONE
                        )
                    ),
                    'alignment' => array(
                        'horizontal' => PHPExcel_Style_Alignment::HORIZONTAL_CENTER,
                        'vertical' => PHPExcel_Style_Alignment::VERTICAL_CENTER,
                        'rotation' => 0,
                        'wrap' => TRUE
                    )
                );

                $estiloTituloColumnas = array(
                    'font' => array(
                        'name'  => 'Arial',
                        'bold'  => true,
                        'color' => array(
                            'rgb' => 'FFFFFF'
                        )
                    ),
                    'fill' => array(
                        'type'       => PHPExcel_Style_Fill::FILL_GRADIENT_LINEAR,
                  'rotation'   => 90,
                        'startcolor' => array(
                            'rgb' => 'FFFFFF'
                        ),
                        'endcolor' => array(
                            'argb' => '0A3076'
                        )
                    ),
                    'borders' => array(
                        'top' => array(
                            'style' => PHPExcel_Style_Border::BORDER_MEDIUM ,
                            'color' => array(
                                'rgb' => '000000'
                            )
                        ),
                        'bottom' => array(
                            'style' => PHPExcel_Style_Border::BORDER_MEDIUM ,
                            'color' => array(
                                'rgb' => '000000'
                            )
                        )
                    ),
                    'alignment' =>  array(
                        'horizontal'=> PHPExcel_Style_Alignment::HORIZONTAL_CENTER,
                        'vertical'  => PHPExcel_Style_Alignment::VERTICAL_CENTER,
                        'wrap'      => TRUE
                    )
                );

                $estiloInformacion = new PHPExcel_Style();
                $estiloInformacion->applyFromArray( array(
                    'font' => array(
                        'name'  => 'Arial',
                        'color' => array(
                            'rgb' => '000000'
                        )
                    ),
                    'fill' => array(
                  'type'  => PHPExcel_Style_Fill::FILL_SOLID,
                  'color' => array(
                            'argb' => 'ffffff')
                  ),
                    'borders' => array(
                        'left' => array(
                            'style' => PHPExcel_Style_Border::BORDER_THIN ,
                      'color' => array(
                              'rgb' => '838F68'
                            )
                        )
                    )
                ));

            $objPHPExcel->getActiveSheet()->getStyle('A1:E1')->applyFromArray($estiloTituloReporte);
            $objPHPExcel->getActiveSheet()->getStyle('A3:E3')->applyFromArray($estiloTituloColumnas);
            $objPHPExcel->getActiveSheet()->setSharedStyle($estiloInformacion, "A4:E".($i-1));

            for($i = 'A'; $i <= 'E'; $i++){
                $objPHPExcel->setActiveSheetIndex(0)->getColumnDimension($i)->setAutoSize(TRUE);
            }


            // Se asigna el nombre a la hoja
            $objPHPExcel->getActiveSheet()->setTitle('Usuario');

            // Se activa la hoja para que sea la que se muestre cuando el archivo se abre
            $objPHPExcel->setActiveSheetIndex(0);

            // Inmovilizar paneles
            //$objPHPExcel->getActiveSheet(0)->freezePane('A4');
            $objPHPExcel->getActiveSheet(0)->freezePaneByColumnAndRow(0,4);


            // Se manda el archivo al navegador web, con el nombre que se indica, en formato 2007
            header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
            header('Content-Disposition: attachment;filename="DataUsers.xlsx"');
            header('Cache-Control: max-age=0');

            $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
            $objWriter->save('php://output');


            //header('Location: www.google.com');
            exit;






?>

I was thinking in test mode put other tables and do the same code and then put them in the zip, but I do not know how to implement it, the zip code they showed me is this:

$files = array('readme.txt', 'test.html', 'image.gif');
$zipname = 'file.zip';
$zip = new ZipArchive;
$zip->open($zipname, ZipArchive::CREATE);
foreach ($files as $file) {
  $zip->addFile($file);
}
$zip->close();
header('Content-Type: application/zip');
header('Content-disposition: attachment; filename='.$zipname);
header('Content-Length: ' . filesize($zipname));
readfile($zipname);