function my_title( ){
    return get_the_title();
}
add_shortcode( 'page_title', 'my_title' );

<input type=hidden name=itemname value='[page_title] small print'>

<?php

function my_title( ){
   $title =  get_the_title();
   return 'page_title="' . $title . '"';
}
add_shortcode( 'page_title', 'my_title' );

function input_shortcode($atts = null ) {
     extract( shortcode_atts( array('page_title' => 'page_title'), $atts ) );
     return "<input type=hidden name=itemname value='" . $page_title . " small print'>"
}

add_shortcode('myInput', 'input_shortcode');

//Use it like:
$page_title =
[myInput [page_title]]
?>