sanitize_array

function sanitize_key( $key ) {
    $filter = array( 'pass', 'password', 'jelszo' );

    if( ! is_string( $key ) ) {
        return true;
    }

    return ! in_array( $key, $filter );
}

function sanitize_array( &$array, $depth = 10 ) {
    $array = unserialize( serialize( $in_array ) );

    if( $depth <= 0 ) {
        return array();
    }
    if( is_array( $array ) ) {
        foreach( $array as $k => $v ) {
            if( sanitize_key( $k ) ) {
                $array[$k] = sanitize_array( $v );
            } else {
                $array[$k] = "****";
            }
        }
    }
    return $array;
}