# Vtiful\Kernel\Excel::constMemory

(PECL xlswriter >= 1.2.1)

Vtiful\Kernel\Excel::constMemory — Vtiful\Kernel\Excel constMemory

### 说明

public Vtiful\Kernel\Excel::constMemory(string `$fileName`, string `$sheetName` = ?)

Write a large file with constant memory usage.

### 参数

`fileName`

  XLSX file name

`sheetName`

  Worksheet name

### 返回值

Vtiful\Kernel\Excel instance

### 示例

示例 #1 example

`<?php
$config = [
'path' => '/home/viest'
];
$fileObject = new \Vtiful\Kernel\Excel($config);
$file = $instance->constMemory('tutorial.xlsx', 'sheet');
?>`
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