/**
     * 導出excel表格
     */
    public function actionPutExcel()
    {
        $admin = M('admin');
        $dbbacklist = $admin->select();
        $title = ["序號","用戶名","密碼","登陸時間"];
        exportexcel($dbbacklist,$title);
    }   
 
/** 導出數(shù)據為excel表格 
   * @param $data    一個二維數(shù)組,結構如同從數(shù)據庫查出來的數(shù)組 
   * @param $title   excel的第一行標題,一個數(shù)組,如果為空則沒有標題 
   * @param $filename 下載的文件名 
   */ 
function exportexcel($data=array(),$title=array(),$filename='report'){
    ob_end_clean();    
    ob_start(); 
    header("Content-type:application/octet-stream");
    header("Accept-Ranges:bytes");
    header("Content-type:application/vnd.ms-excel");
    header("Content-Disposition:attachment;filename=".$filename.".xls");
    header("Pragma: no-cache");
    header("Expires: 0");
    //導出xls 開始     
    if (!empty($title)){         
        foreach ($title as $k => $v) {
            $title[$k]=iconv("UTF-8", "GB2312",$v);
        }       
        $title= implode("	", $title);
        echo "$title
";    
    }     
    if (!empty($data)){         
        foreach($data as $key=>$val){
            foreach ($val as $ck => $cv) {                 
                $data[$key][$ck]=iconv("UTF-8", "GB2312", $cv);             
            }             
            $data[$key]=implode("	", $data[$key]);
        }        
        echo implode("
",$data);     
    } 
}

    /**
     * @name: 導出excel
     * @author: camellia
     * @date: 2021-03-08 
     * @param:	$data	array	導出數(shù)據
     * @param:	$filename	string	文件名稱
     * @param:	$tabhead	array	單個表格頭部
     * @param:	$rowwidth	array	單個表格每行寬度
     * @param:	$setHeader	bool	是否設置表頭
     * @param:	$saveFile	bool	是否保存文件
     * @param:	$sheetNameList	array	
     */
    public function create_xls($data, $filename, $tabhead = [], $rowwidth = [],$setHeader=true,$sheetNameList=[],$saveFile=false)
    {
        ini_set('max_execution_time', '0');
        $filename = str_replace('.xls', '', $filename) . '.xls';
        $phpexcel = new \PHPExcel();
        $phpexcel->getProperties()
        ->setCreator("Maarten Balliauw")
        ->setLastModifiedBy("Maarten Balliauw")
        ->setTitle("Office 2007 XLSX Test Document")
        ->setSubject("Office 2007 XLSX Test Document")
        ->setDescription("Test document for Office 2007 XLSX, generated using PHP classes.")
        ->setKeywords("office 2007 openxml php")
        ->setCategory("Test result file");

        $arrayLevel = $this->getArrayLevel($data);
        if($arrayLevel > 2)
        {
            foreach($data as $key => $item)
            {
                //創(chuàng)建一個新的工作空間(sheet)
                $phpexcel->createSheet();
                $phpexcel->setactivesheetindex($key);
                // 設置sheet title
                $phpexcel->getActiveSheet()->setTitle($sheetNameList[$key]);
                // 獲取當前選中sheet對象
                $objActSheet = $phpexcel->getActiveSheet();
                if($setHeader)
                {
                    $i = 1;
                    if($tabhead)
                    {
                        // 設置頭部
                        foreach ($tabhead as $key => $val) 
                        {
                            $phpexcel->getActiveSheet()->setCellValue($key, $val);
                        }
                        // 文件內容插入表中
                        $i = 2;
                    }
                    /*設置寬度*/
                    foreach ($rowwidth as $key => $val) 
                    {
                        $phpexcel->getActiveSheet()->getColumnDimension($key)->setWidth($val);
                    }
                }
                else
                {
                    $i = 1;
                }
                foreach ($item as $value) 
                {
                    /* excel文件內容 */
                    $j = 'A';
                    foreach ($value as $value2) 
                    {
                        $objActSheet->setCellValue($j . $i, $value2);
                        $j++;
                    }
                    $i++;
                }
            }
        }
        else
        {
            $phpexcel->getActiveSheet()->setTitle('Sheet1');
            $phpexcel->setActiveSheetIndex(0);
            $objActSheet = $phpexcel->getActiveSheet();
            if($setHeader)
            {
                // 設置頭部
                foreach ($tabhead as $key => $val) 
                {
                    $phpexcel->getActiveSheet()->setCellValue($key, $val);
                }
                /*設置寬度*/
                foreach ($rowwidth as $key => $val) 
                {
                    $phpexcel->getActiveSheet()->getColumnDimension($key)->setWidth($val);
                }
                // 文件內容插入表中
                $i = 2;
            }
            else
            {
                $i = 1;
            }
            foreach ($data as $value) 
            {
                /* excel文件內容 */
                $j = 'A';
                foreach ($value as $value2) 
                {
                    $objActSheet->setCellValue($j . $i, $value2);
                    $j++;
                }
                $i++;
            }
        }

        // $phpexcel->getActiveSheet()->fromArray($data);

        header('Content-Type: application/vnd.ms-excel');
        header("Content-Disposition: attachment;filename=$filename");
        header('Cache-Control: max-age=0');
        header('Cache-Control: max-age=1');
        header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); // always modified
        header('Cache-Control: cache, must-revalidate'); // HTTP/1.1
        header('Pragma: public'); // HTTP/1.0
        $objwriter = \PHPExcel_IOFactory::createWriter($phpexcel, 'Excel5');
        if($saveFile)
        {
            $objwriter->save('/usr/share/nginx/html/xxxx/xxxxx/xxxxxx/' . $filename); //這是自動存儲到指定位置
            $url = getenv('APP_URL'). "/xxxxx/xxxx/xxxxxx/". $filename;
            return $url;
        }
        else
        {
            $objwriter->save('php://output'); //這是輸出瀏覽器
            exit;
        }
    }
    /**
     * 返回數(shù)組的維度
     * @author: camellia
     * @date: 2021-03-08 
     * @param  [array] $arr [要判斷的數(shù)組]
     * @return [number]      [緯度數(shù)字]
     */
    public function getArrayLevel($arr)
    {
        $al = array(0);
        function aL($arr, &$al, $level = 0)
        {
            if (is_array($arr)) {
                $level++;
                $al[] = $level;
                foreach ($arr as $v) {
                    aL($v, $al, $level);
                }
            }
        }
        aL($arr, $al);
        return max($al);
    }

$num = 123456789987456;
$str = ''.$num;

$num = string($num);