Moving Function to Header..

Hi guys,

I’m trying to move some PHP code from my Functions.php to my Header.php.

function hello() {
global $post;
if (!is_single()) {
    return;
}

//print_r($post);
$pony = strip_tags($post->post_content);
$pony = str_replace(array('"',"'", "\n", "\r", "\t"), ''', $pony);

echo "$pony";
}

add_action('wp_head', 'hello');

I’ve tried:

<?PHP {
global $post;
if (!is_single()) {
    return;
}

//print_r($post);
$pony = strip_tags($post->post_content);
$pony = str_replace(array('"',"'", "\n", "\r", "\t"), ''', $pony);

echo "$pony";
}

;?>

etc.. But this doesn’t work.

Any help would be much appreciated.

Thanks,
Lou