//CREO IL PORCO DIO LADRO DI META BOX

add_action('add_meta_boxes', 'about_template_meta_box');
function about_template_meta_box(){
    add_meta_box(
        'page_link_options',
        __('!!MANDATORY!! -> SET A LINK NAME FOR THIS PAGE - ONLY LETTERS AND NUMBERS - NO SPACES - NO CAPS - NO SPECIAL CHARS'),
        'page_link_options',
        'page'
    );
}

function page_link_options(){
    //la form del cristo in croce
}





add_action('admin_head-post-new.php', 'foo_page_template_script');

function foo_page_template_script(){
    global $post;

    # FILTERO SOLTANTO ALLE PAGINE
    if('page' !== $post->post_type)
        return;

    #NOME DEL FILE DEL PORCO JESUS
    $file = 'about.php';

    $output = "
        <!-- Hide the Meta Box -->
        <style type='text/css'>
            #page_link_options{display:none;}
        </style>

        <script type='text/javascript'>
            jQuery(document).ready(function($){
                var _file = '$file';
                var _meta_box = $('#page_link_options');
                var _page_template = $('#page-template');

                //Show meta box on page load
                if(_file == _page_template.val())
                    _meta_box.show();

                //Sniff changes to the page template dropdown
                _page_template.change(function(){
                    if(_file == _page_template.val())
                        _meta_box.show();
                });
            });
        </script>
    ";
    echo $output;
}