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Bug #65558 FILTER_VALIDATE_EMAIL doesn't invalidate email with double quote as local part.
Submitted: 2013-08-26 10:11 UTC Modified: 2013-08-27 17:42 UTC
From: fleshgrinder at gmx dot at Assigned:
Status: Not a bug Package: filter (PECL)
PHP Version: 5.5.3 OS: Debian 7.0
Private report: No CVE-ID: None
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From: fleshgrinder at gmx dot at
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 [2013-08-26 10:11 UTC] fleshgrinder at gmx dot at
The local part of the email address is empty and the address should not validate at all.

Quote from RFC 5322 section 3.4.1 about double quote usage:

quoted-string = [CFWS] DQUOTE *([FWS] qcontent) [FWS] DQUOTE [CFWS] qcontent = qtext / quoted-pair qtext = %d33 / ; Printable US-ASCII %d35-91 / ; characters not including %d93-126 / ; "\" or the quote character obs-qtext quoted-pair = ("\" (VCHAR / WSP)) / obs-qp

Quote from RFC 5322 section 3.4.1 about local-part:

local-part = dot-atom / quoted-string / obs-local-part dot-atom = [CFWS] dot-atom-text [CFWS] dot-atom-text = 1*atext *("." 1*atext) quoted-string = [CFWS] DQUOTE *([FWS] qcontent) [FWS] DQUOTE [CFWS] obs-local-part = word *("." word) word = atom / quoted-string atom = [CFWS] 1*atext [CFWS]

Test script:
var_dump(filter_var('""', FILTER_VALIDATE_EMAIL));

Expected result:

Actual result:


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 [2013-08-27 11:20 UTC] cmbecker69 at gmx dot de
The behavior is in accordance with RFC 5322.

|  quoted-string = [CFWS]
|                  DQUOTE *([FWS] qcontent) [FWS] DQUOTE
|                  [CFWS]

All parts except the two DQUOTEs are optional (see RFC 5234, 
especially section 3.6[1]), so the local part of an email address 
may consist of two quotes only.

[1] <>
 [2013-08-27 11:41 UTC] fleshgrinder at gmx dot at
-Status: Open +Status: Closed
 [2013-08-27 11:41 UTC] fleshgrinder at gmx dot at
After reading things more closely, you are right. Sorry for the report.
 [2013-08-27 17:42 UTC]
-Status: Closed +Status: Not a bug
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