PHP中生成UUID自定义函数分享,phpuuid自定义函数_PHP教程
PHP中生成UUID自定义函数分享,phpuuid自定义函数
UUID 全称是 Universally unique identifier,它是一种识别符,使用任意的计算机都可以生成,不需要一个中央数据库进行管理,即可以保证几乎没有重复的几率。而 UUID 的值域之大,据说给世界上每一粒沙子分配一个 UUID,也不会有重复的。
最近在改 WordPress 的代码,需要用到 UUID。但是,PHP 中居然没有生成 UUID 的函数,只好自己写一个。
if (!function_exists('com_create_guid')) { function com_create_guid() { return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x', mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0x0fff ) | 0x4000, mt_rand( 0, 0x3fff ) | 0x8000, mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ) ); } }
上述代码可以生成一个 UUID version 4。UUID 目前有 5 个版本,其中第四版是完全随机的,生成起来比较容易。而其中的 com_create_guid,是 Windows 中 PHP 的一个函数,它直接调用 COM 的 CreateGuid 函数来生成 UUID,但是在 Linux 没有对应的函数库,只好自己写了。为了方便在不同的平台上使用,就创建了一个同名的函数。其它的代码就是生成随机数了。
至于用法,就直接调用 com_create_guid() 即可。

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