Check if a string is a valid email

isValidEmail.php

function isValidEmail($email)
{
    if (empty($email)) {
        return false;
    }

    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
        if (@count(explode("@", $email)) != 2) {
            return false;
        } else {
            return true;
        }
    } else {
        return false;
    }
}