form subject title post or page

hi, I need to send email from the form with the reference page ..
I tried it with a shordcode [page_title]:

function myshortcode_title( ){
return get_the_title();
}
add_shortcode( ‘page_title’, ‘myshortcode_title’ );

but nothing to do ..
you have any suggestions? you can do it?
would be fine in the message that comes …