PHP中把有符号整型转换为无符号整型方法

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PHP中把有符号整型转换为无符号整型方法_PHP

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May 30, 2016 am 08:47 AM

phpunsigned integersigned integerConvert

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。

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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