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Request #55865 email cyrillic symbols contains are not valid at filter_var function
Submitted: 2011-10-07 15:02 UTC Modified: 2015-06-15 23:26 UTC
Votes:8
Avg. Score:4.8 ± 0.4
Reproduced:5 of 6 (83.3%)
Same Version:3 (60.0%)
Same OS:3 (60.0%)
From: mitallast at gmail dot com Assigned:
Status: Open Package: Filter related
PHP Version: 5.3.8 OS: nix*, mac
Private report: No CVE-ID:
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 [2011-10-07 15:02 UTC] mitallast at gmail dot com
Description:
------------
Php contains filter_var function with predefined constaint FILTER_VALIDATE_EMAIL.
This function incorrect validate email with cyrrilic symbols.
Error can be at file "ext/filter/logical_filters.c" at function "void 
php_filter_validate_email(PHP_INPUT_FILTER_PARAM_DECL)"

Test script:
---------------
<?php
$value = "тест@тест.рф";
var_dump(filter_var($value, FILTER_VALIDATE_EMAIL));

Expected result:
----------------
(boolean)true

Actual result:
--------------
(boolean)false

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 [2011-11-25 09:03 UTC] enderstd at gmail dot com
I think this behaviour is all right. There is a punycode form for IDN domains, 
and 
filter_var undestands it well enough, yet not without some issues. But I think 
punycode is way to go.

http://en.wikipedia.org/wiki/Punycode

And by the way, "тест@тест.рф" is invalid email anyway, because mailbox can't 
contain IDN characters, I think it violates some basic SMTP RFC. Valid domain 
would be like "test@тест.рф".
 [2012-07-15 00:00 UTC] doomasmile at gmail dot com
Signed.

Function must be refactored.
http://en.wikipedia.org/wiki/.%D1%80%D1%84
 [2015-06-15 23:26 UTC] cmb@php.net
-Type: Bug +Type: Feature/Change Request -Package: *Mail Related +Package: Filter related
 [2015-06-15 23:26 UTC] cmb@php.net
Actually, this is not a bug, because the documentation[1] states:

| In general, this validates e-mail addresses against the syntax
| in RFC 822, [...]

However, IDNs are not allowed by RFC 822, let alone local parts
with non ASCII characters; these are subject of RFC 6530-6533.
Therefore I'm switching to feature request, and do not mark this
ticket as duplicate of request #39469, because that request is
only about IDN support.

[1] <http://php.net/manual/en/filter.filters.validate.php>
 
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