> For the complete documentation index, see [llms.txt](https://xlswriter-docs.viest.me/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xlswriter-docs.viest.me/zhong-wen-jian-ti/helper/column-index-number-string-transform.md).

# 列标字符转化

## 数字转字符

```php
var_dump(\Vtiful\Kernel\Excel::stringFromColumnIndex(0));  // A
var_dump(\Vtiful\Kernel\Excel::stringFromColumnIndex(28)); // AC
```

## 字符转数字

```php
var_dump(\Vtiful\Kernel\Excel::columnIndexFromString('A'));  // 0
var_dump(\Vtiful\Kernel\Excel::columnIndexFromString('AC')); // 28
```