Check django passwords in PHP (django-1.3)

check_django_password.php

function check_django_password($plaintext, $hashed) {
    $parts = explode('$', $hashed);
    if(count($parts) != 3) return FALSE;
    if($parts[0] == 'sha1' && sha1($parts[1] . $plaintext)) == $parts[2])
        return TRUE;
    if($parts[0] == 'md5' && md5($parts[1] . $plaintext)) == $parts[2])
        return TRUE;
    return FALSE;
}