How to add a particular word at start?

[desi]

I am stuck at one place where I want to add a particular word or variable at start-

$data2 = substr($output,-10);
$que = array(' ', '_');
$cod = array('','');
$h = hey;
$data = str_replace ($que,$cod,$data2);

I want to add the word "hey" or say any variable at start of $data value.

Any idea how can I do that?

[Krik]

$newdata = $h . $data;