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T5 Extend Email Checks
<?php # -*- coding: utf-8 -*-
Plugin Name: T5 Extend Email Checks
Description: Overrides the results of the functions <code>is_email()</code> and <code>sanitize_email()</code>. Allows for example <code>me@localhost</code> or punycode encoded email adresses by using PHP’s internal filter function.
Version: 2012.08.29
Plugin URI:
Author: Thomas Scholz
Author URI:
License: MIT
! defined( 'ABSPATH' ) and exit;
if ( ! function_exists( 't5_extend_email_checks' ) )
add_filter( 'is_email', 'extend_email_checks', 10, 2 );
add_filter( 'sanitize_email', 'extend_email_checks', 10, 2 );
function t5_extend_email_checks( $result, $email )
return filter_var( $email, FILTER_VALIDATE_EMAIL );

hakre commented May 15, 2011

Is there a reason you don't return the filtered $email if the filter_var did not false?


thefuxia commented May 15, 2011

Uhm … but I do exactly this!?

hakre commented May 15, 2011

filtered in the meaning of filter_var(), e.g.: return filter_var( $email, FILTER_VALIDATE_EMAIL ); -- filter_var will either return FALSE or the filtered value of $email. In your gist you return $email unfiltered.


thefuxia commented May 16, 2011

Oh, I see. :) Changed.

swinhoe commented Sep 14, 2011

Ive tested this and it still errors on an apostrophe.. is it working for you ?


thefuxia commented Sep 14, 2011

Do you mean an apostrophe in a mail address or a parse error?

swinhoe commented Sep 15, 2011

no, no parse error, but the address is still rejected.

does the PHP filter not allow apostrophes ?


thefuxia commented Sep 16, 2011

The filter allows apostrophes, at least the fake apostrophe '. Hm, the WordPress functions should allow it too. I’m not sure what happens here.

swinhoe commented Sep 16, 2011

They, dont, its a logged issue in WP Trac. Im trying to find the easiest workaround...

swinhoe commented Apr 23, 2012

Are we going to get this change pushed into a future release ?

It would be handy to support email address's properly...


thefuxia commented Apr 23, 2012

There is an open ticket:

Go, vote for it, add Unit tests. Then it may become part of the core.

swinhoe commented Apr 23, 2012


thefuxia commented Apr 23, 2012

Ask on Trac. I have no influence to core development.

The callback functions need the t5_ prefix - have forked a working example.

Note that apostrophes are escaped by WordPress, so they are still invalid.

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