valid_email()

valid_email($email)

Checks if the input is a correctly formatted e-mail address. Note that is doesn’t actually prove that the address will be able recieve mail, but simply that it is a validly formed address.

Example:

if (valid_email('[email protected]'))
{
        echo 'email is valid';
}
else
{
        echo 'email is not valid';
}

(bool) filter_var($email, FILTER_VALIDATE_EMAIL);