Issue with validate email using PHP

Question

I have the following code to check if user input is a valid email, there might be a few questions already about this but noone seems to validate the PHP function.

/* check if valid email*/
public function isValidEmail($email){
    if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
        return true;
    }
    return false;
}

If we do a test using this function:

isValidEmail('[email protected]')

This should return false because characters like ?= are inside the email address. Is there a stricter way to check email?

By "to write out nothing" - Do you mean it returns true with the test input? — Epodax
– Epodax, Commented Mar 1, 2016 at 13:34
You pass the variable to your function as $epost but then access it as $email - this won't check the passed variable. — Luke
– Luke, Commented Mar 1, 2016 at 13:37
See this: stackoverflow.com/questions/19220158/… your test address seems in fact valid. — Bart Friederichs
– Bart Friederichs, Commented Mar 1, 2016 at 13:40

Community · Accepted Answer · 2017-05-23 12:15:41Z

2

The problem here is that ? and = are perfectly valid for an email address. From Wikipedia on the RFC controlling email addresses

The local-part of the email address may use any of these ASCII characters:
These special characters: !#$%&'*+-/=?^_`{|}~ (ASCII: 33, 35–39, 42, 43, 45, 47, 61, 63, 94–96, 123–126)

If you're trying to make sure the email address actually exists, just be aware that that path is very difficult

edited May 23, 2017 at 12:15

CommunityBot

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answered Mar 1, 2016 at 13:46

Machavity♦

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