PHP生成随机字符串的三种方法
使用PHP开发应用程序，尤其是网站程序，常常需要生成随机密码，如用户注册生成随机密码，用户重置密码也需要生成一个随机的密码。随机密码也就是一串固定长度的字符串，文章整理了几种生成随机字符串的方法。
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