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Editorial Team
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Asked: 2026-05-16T05:25:01+00:00

I was just setting up the validation for a form in which I decided

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I was just setting up the validation for a form in which I decided to try using the filter_var function to check the validity of my email address. I can not find out what filter_var actually allows anywhere though (since the documentation is very simple), and I found out that it is allowing an email address like test@test. Doesn’t there have to be a .com, .net etc… in the domain?

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  1. Editorial Team

    The behavior has changed somewhere around April. See bug #49576 and revision 297350.

    That e-mail is indeed invalid, or at least that’s what the PHP developers understood. The source carries this notice:

    /*
 * The regex below is based on a regex by Michael Rushton.
 * However, it is not identical.  I changed it to only consider routeable
 * addresses as valid.  Michael's regex considers a@b a valid address
 * which conflicts with section 2.3.5 of RFC 5321 which states that:
 *
 *   Only resolvable, fully-qualified domain names (FQDNs) are permitted
 *   when domain names are used in SMTP.  In other words, names that can
 *   be resolved to MX RRs or address (i.e., A or AAAA) RRs (as discussed
 *   in Section 5) are permitted, as are CNAME RRs whose targets can be
 *   resolved, in turn, to MX or address RRs.  Local nicknames or
 *   unqualified names MUST NOT be used.

    The changelog mentions this bug fix for PHP 5.3.3 and PHP 5.2.14.

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