# 数据类型常量

```php
const TYPE_STRING = 0x01;    // 字符串
const TYPE_INT = 0x02;       // 整型
const TYPE_DOUBLE = 0x04;    // 浮点型
const TYPE_TIMESTAMP = 0x08; // 时间戳，可以将 xlsx 文件中的格式化时间字符转为时间戳
```


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