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生成唯一字母 ID 求解
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PHP - @lg106 - 有一个需求是不用数字作为用户 ID，要用英文字母我现在有三种解决方案第一种：用户注册时候，生成一个随机英文字符串，去查用户表，如果重复再重新生成，直到唯一。第二种：先生成一张字
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