如何检查PHP中的重复电子邮件地址，考虑Gmail（[e-mail]） [英] How to check for a duplicate email address in PHP, considering Gmail ([e-mail])

问题描述

如何在PHP 中检查重复的电子邮件地址，可能会考虑到Gmail的自动贴标机和标点符号？

How can I check for duplicate email addresses in PHP, with the possibility of Gmail's automated labeler and punctuation in mind?

例如我希望这些被发现是重复的：

For example, I want these addressed to be detected as duplicates:

         [e-mail]
        [e-mail]
   [e-mail]
  [e-mail]

$ b $尽管Daniel A. White声称：在Gmail中，@（和标签）之前的随机位置的点可以放置得尽可能多。 [e-mail]和[e-mail]实际上是一样的用户。

Despite what Daniel A. White claims: In Gmail, dots at random places before the '@' (and label) can be placed as much as you like. [e-mail] and [e-mail] are in fact the same user.

推荐答案

$email_parts    = explode('@', $email);

// check if there is a "+" and return the string before
$before_plus    = strstr($email_parts[0], '+', TRUE);
$before_at      = $before_plus ? $before_plus : $email_parts[0];

// remove "."
$before_at      = str_replace('.', '', $before_at);

$email_clean    = $before_at.'@'.$email_parts[1];

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