方法一

public function xlsx($lists)
{
    //生成文件名
    $date = date("Y-m-d_H:i:s", time());
    $fileName = "file_" . $date . ".xlsx";
    //头部标题
    $xlsx_header = ['手机号', '姓名'];
    ob_get_clean();
    ob_start();
    echo implode("\t", $xlsx_header),"\n";
    $num = 0;
    foreach ($lists as $key => $value) {
        $data = [];
        $data[] = $value['phone'];
        $data[] = $value['name'];
        echo implode("\t", $data),"\n";
    }
    header('Content-Disposition: attachment; filename='.$fileName);
    header('Accept-Ranges:bytes');
    header('Content-Length:' . ob_get_length());
    header('Content-Type:application/vnd.ms-excel');
    ob_end_flush();
}

方法二 PHPExcel

public function xlsx($title)
{
	$header_arr =['A','B','C','D','E','F','G','H','I','J','K','L','M', 'N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];
    $objPHPExcel = new PHPExcel();//实例化一个要保存的phpExcel对象
    $objPHPExcel->setActiveSheetIndex(0);
    //在激活的工作区写入数据 (数组写入数据演示)
    $startRow = 1;
    //我这个只写入了一行  亲亲要是多行 记得 $startRow++
    foreach ($title as $k=>$v) {
        $objPHPExcel->getActiveSheet()->setCellValue($header_arr[$k].$startRow,$v);
    }

    header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');

    header('Content-Disposition: attachment;filename="模板.xlsx"');

    header('Cache-Control: max-age=0');

    $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');

    $objWriter->save('php://output');

    exit;
}