phpemailemail-validationfilter-var

Why does PHP filter_var say that this is a valid email address?

I use the filter_var PHP function to validate email address when a user signs up to my site.

I use this code from the post:

$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

then later I do:

if(!$email) {
  // return to the form 
}
else {
  // send registration info
}

now when I var_dump($email), I get the output:

string(23) "user."name"@example.com"

I would like to know why this does not return false. I think the double quotes are not acceptable, so why does PHP say it’s valid?

Solution

  • It is a valid email address :

    A quoted string may exist as a dot separated entity within the local-part or it may exist when the outermost quotes are the outermost chars of the local-part (e.g. abc."defghi".xyz@example.com or "abcdefghixyz"@example.com are allowed. abc"defghi"xyz@example.com is not; neither is abc\"def\"ghi@example.com).