删除基于域的重复电子邮件地址

Question

我想删除重复的电子邮件地址基础上的域名。例如：

aa@example.com
bb@example.com
cc@bla.com

Should become:

aa@example.com
cc@bla.com

有人能帮忙吗？我试过使用sort / uniq和awk，但还没有让它正常工作。

Answer 1

在php中：

<?php
$domains   = []; // list of domains we have already included
$cleanList = []; // "clean" email list
$list      = file('/path/to/email-list.txt'); // load the raw list

// loop over the raw list
foreach($list as $email) {
   // extract the domain from the email
   $domain = preg_replace('/^.*@/', '', $email);

   // if the domain has not been taken yet
   if(!in_array($domain, $domains)) {
      // add it to the list of taken domains
      array_push($domains, $domain);

      // add the email to the clean list
      array_push($cleanList, $email);
   }
}

// write the clean list out to a file
file_put_contents('/tmp/clean-emails.txt', implode("\n", $cleanList));