brian dichiara

<?php
function validEmail($email_address){
    // First, we check that there's one @ symbol, and that the lengths are right
    if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email_address)) {
        // Email invalid because wrong number of characters in one section, or wrong number of @ symbols.
        return false;
    }
    // Split it into sections to make life easier
    $email_array = explode("@", $email_address);
    $local_array = explode(".", $email_array[0]);
    for ($i = 0; $i <sizeof($local_array); $i++) {
        if (!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$", $local_array[$i])) {
            return false;
        }
    }
    if (!ereg("^\[?[0-9\.]+\]?$", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name
        $domain_array = explode(".", $email_array[1]);
        if (sizeof($domain_array) <2) {
            return false; // Not enough parts to domain
        }
        for ($i = 0; $i <sizeof($domain_array); $i++) {
            if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_array[$i])) {
                return false;
            }
        }
    }
    return true;
}
?>