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I'm trying to allow a user to have multiple email addresses associated with their account. update_user_meta() will not work because it will overwrite the current email. add_user_meta() wouldn't work either because it would duplicate the entry, even if it is the same email address.. Any ideas?

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You can use update_user_meta() and add_user_meta(), just store all the email addresses in an array in a new field. If you have a requirement, such as preventing duplicates, run a validation function that checks for that before updating the database.

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Is there some validator function native to wordpress, similar to update_user_meta() checking for duplicate keys. Is there something that looks for the value? –  Greg Wiley Sep 12 '12 at 19:58
    
Not to WordPress, but you can accomplish that particular validation with PHP's array_unique function: php.net/manual/en/function.array-unique.php –  NightHawk Sep 12 '12 at 20:23
    
Thanks for your help. –  Greg Wiley Sep 12 '12 at 20:46
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