function type($num,$a) {
    if ( $num & 1 ) {
        echo position($num,$a).' digit is odd number<br/>';
    } else {
        echo position($num,$a).' digit is even number<br/>';
    }
}

$array = array(
    'f1' => hint($a2,$a),
    'f2' => type($a2,$a),
    'f3' => len($a2,$a),
);

echo $array['f1'];