PHP中把有符号整型转换为无符号整型方法，php整型
PHP中把有符号整型转换为无符号整型方法，php整型
在一个短地址项目中，根据六位字符与ID的相互映射的算法，当ID超过2147483647的时候，六位字符的短地址映射的ID变成有符号的整型。
复制代码 代码如下:
ID > 六位字符 >映射ID
ID: 2147483644 > TfffVQ > 2147483644
ID: 2147483645 > efffVQ > 2147483645
ID: 2147483646 > NfffVQ > 2147483646
ID: 2147483647 > ffffVQ > 2147483647
ID: 2147483648 > nnnnnu > -2147483648
ID: 2147483649 > dnnnnu > -2147483647
ID: 2147483650 > rnnnnu > -2147483646
需要把有符号整型转换为无符号整型：(float) sprintf('%u', $id)
PHP官网关于整型的资料：http://php.net/manual/zh/language.types.integer.php
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