php Excel导出id

<form action="{:U('Index/files')}" method="post" enctype="multipart/form-data">
            <label for="file">Filename:</label>
            <input type="file" name="file" id="file"/>
            <br/>
            <input type="submit" name="submit" value="Submit"/>
        </form>

 public function files(){
            $filename = $_FILES['file']['name'];
            $ext = preg_split("/\./", $filename);
            $ext = strtolower($ext[1]);
            /*
            * 获取文件后缀名
            */
            $allowed_types = array("xls", "xlsx");
            $filePath = "./Public/excel/" . $_FILES["file"]["name"];
//            print_r($filePath);die;

            if (!in_array($ext, $allowed_types)) {
                echo "File type is wrong!";
                die;
            }
//            else if (file_exists($filePath)) {
//                echo "A file with this name already exists!";
//                die;
//            }
            else {
                move_uploaded_file($_FILES["file"]["tmp_name"], $filePath);
            }
            /**
             * @param $val
             * @return string
             * 检查文件名是否符合要求，如果符合，就保存到指定路径。如果不符合，报错。
             */
//            import("Org.Util.PHPExcel");
            require_once  "./ThinkPHP/Library/Org/Util/PHPExcel/Classes/PHPExcel.php";
//$filePath=$_FILES["file"]["tmp_name"];
//sleep(50);
            $PHPExcel = new \PHPExcel();
//默认用excel2007读取excel，若格式不对，则用之前的版本进行读取
            $PHPReader = new \PHPExcel_Reader_Excel2007();
            if (!$PHPReader->canRead($filePath)) {
                $PHPReader = new \PHPExcel_Reader_Excel5();
                if (!$PHPReader->canRead($filePath)) {
                    return $this->error(null, "no file");
                }
            }
            $PHPExcel = $PHPReader->load($filePath);
            $sheetCount = $PHPExcel->getSheetCount();
            $sheetNames = $PHPExcel->getSheetNames();
//var_dump($sheetNames);
//die;
            /**读取excel文件中有多少个sheet*/
            $objExcel = array();
            for ($SheetID = 0; $SheetID < $sheetCount; $SheetID++) {
                /**读取excel文件中的工作表*/
                $name = $sheetNames[$SheetID];
                $currentSheet = $PHPExcel->getSheetByName($name);
                $name = iconv("utf-8", "gb2312", $name);
                /**取得最大的列号*/
                $allColumn = $currentSheet->getHighestColumn();
                /**取得一共有多少行*/
                $allRow = $currentSheet->getHighestRow();
                for ($currentRow = 1; $currentRow <= $allRow; $currentRow++) {
                    /**从第A列开始输出*/
                    for ($currentColumn = 'A'; $currentColumn <= $allColumn; $currentColumn++) {
                        $val = $currentSheet->getCellByColumnAndRow(ord($currentColumn) - 65, $currentRow)->getValue();
                        $val = iconv("utf-8", "gb2312", $val);
                        $objExcel[$name][$currentRow - 1][ord($currentColumn) - 65] = $val;
                        //编码需要转换成gb2312
                        /*
                        $val = urlencode($val);
                        $objExcel[$name][$currentRow - 1][ord($currentColumn) - 65] = urldecode($val);
                        */
                    }
                }
            }

            unlink($filePath);
            /*
            * $objExcel = json_encode($objExcel);
            * $objExcel = urldecode($objExcel);
            * 读取文件中的内容，因为json_encode()的参数必须是utf-8编码。为了保证汉字输出的结果，这里先将数组中的内容用urlencode进行编码，
            * 在被json_encode()编码之后，再用urldecode解码。
            */
//return $objExcel;
//            print_r($objExcel);
            foreach ($objExcel as $k=>$v){
                //取出里面的id拼接成新的一维数组
                $result = array_reduce($v, 'array_merge', array());
                //过滤掉里面的空值取出id
               $id = array_filter($result);

            }

        }