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Date: Fri, 06 Feb 2015 15:14:54 +0000
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Subject: Re: [PHP-DEV] filter_var doesn't support international email addresses
From: rowan.collins@gmail.com (Rowan Collins)

j adams wrote on 06/02/2015 00:05:
> Please let me know which mailing list address to use if I have sent this to
> the wrong list.
>
> filter_var does not properly validate emails with international characters.
> For example, this returns FALSE:
>
> var_dump(filter_var("Pelé@example.com", FILTER_VALIDATE_EMAIL));
>
> Are there any plans to implement proper validation of email addresses as
> described in RFC 6530?
> http://tools.ietf.org/html/rfc6530

Hi,

There was a discussion a while back about Internationalized Domain Name 
support in FILTER_VALIDATE_URL [1], and I believe there was a concern 
that since not all systems would accept the wider format, allowing them 
through the existing filter might be unhelpful. This is particularly 
true in the case of internationalized e-mails, since if I understand it 
correctly it's an "all or nothing" system, rather than one with a 
compatible fallback like the "punycode" notation used in domains.

The most useful would probably be to add a new filter type which 
accepted the new format, so that users could choose to accept what they 
know they can process. If you know of or can create a succinct validity 
test (e.g. a PCRE-compatible regex) it ought to be fairly easy to add; 
the existing implementation is here for comparison: 
http://lxr.php.net/xref/PHP_TRUNK/ext/filter/logical_filters.c#575

[1] 
http://grokbase.com/t/php/php-internals/149jfzxtq3/internationalized-domain-name-support-in-filter-validate-url

Regards,
-- 
Rowan Collins
[IMSoP]