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Bug #70792 FILTER_VALIDATE_EMAIL have limit for 64 characters on the user part
Submitted: 2015-10-26 14:16 UTC Modified: 2015-10-26 19:17 UTC
From: nadavvin at gmail dot com Assigned:
Status: Not a bug Package: Filter related
PHP Version: 5.6.14 OS: windows
Private report: No CVE-ID: None
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From: nadavvin at gmail dot com
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 [2015-10-26 14:16 UTC] nadavvin at gmail dot com 
Description:
------------
filter_var with FILTER_VALIDATE_EMAIL failed when user part of email is longer than 64 characters.

Test script:
---------------
php -r "echo filter_var('123456789012345678901234567890abcderghjklpoinhyxxxxxxxxxxxxxxxxx@gmailxx.com', FILTER_VALIDATE_EMAIL) ? 'True' : 'False';"

php -r "echo filter_var('123456789012345678901234567890abcderghjklpoinhyxxxxxxxxxxxxxxxxxx@gmail.com', FILTER_VALIDATE_EMAIL) ? 'True' : 'False';"

Expected result:
----------------
True

True

Actual result:
--------------
True

False

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 [2015-10-26 16:35 UTC] php at sogetthis dot com 
RFC5321 4.5.3.1.1: The maximum total length of a user name or other local-part is 64 octets.
 [2015-10-26 19:17 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2015-10-26 19:17 UTC] requinix@php.net 
That.
 [2015-10-27 05:38 UTC] a at b dot c dot de 
RFC 4.5.3.1
"Every implementation MUST be able to receive objects of at least these sizes. .... To the maximum extent possible, implementation techniques that impose no limits on the length of these objects should be used."

In other words, just because you _can_ impose the restriction, doesn't mean you _should_.
 
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