Description:
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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:
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var_dump(filter_var('""@php.net', FILTER_VALIDATE_EMAIL));

Expected result:
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bool(false)

Actual result:
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string(""@php.net)