META BOX PIANO

// META BOX PIANO

add_action( 'add_meta_boxes', 'piano_select_box' );
function piano_select_box() {
    add_meta_box(
        'piano_select_box', // id, used as the html id att
        __( 'Piano' ), // meta box title
        'piano_select_cb', // callback function, spits out the content
        'post', // post type or page. This adds to posts only
        'side', // context, where on the screen
        'low' // priority, where should this go in the context
    );

}

function piano_select_cb( $post ) {
    global $wpdb;
    $value = get_post_meta($post->ID, 'piano', true);


    $piani = array(
  __(' ground floor, ','sacconicase') => ' piano terra ',   __(' upper ground floor, ','sacconicase') => ' piano rialzato ',
__(' ground floor or 1st floor, ','sacconicase') => ' piano terra o primo piano',
 __(' 1st floor, ','sacconicase') => ' 1°piano ',
 __(' 2nd floor, ','sacconicase') => ' 2°piano ',
__(' 2nd or 3rd floor, ','sacconicase') => ' 2°o 3° piano ',
  __(' 3rd floor, ','sacconicase') => ' 3°piano ',
__(' 4th floor, ','sacconicase') => ' 4°piano ',
__(' 5th floor, ','sacconicase') => ' 5°piano ',
__(' 6th floor, ','sacconicase') => ' 6°piano ',
__(' 7th floor, ','sacconicase') => ' 7°piano ',
__(' 8th floor, ','sacconicase') => ' 8°piano ',
__(' 9th floor, ','sacconicase') => ' 9°piano ',
__(' 10th floor, ','sacconicase') => ' 10°piano ',
__(' 11th floor, ','sacconicase') => ' 11°piano ',
__(' 12th floor, ','sacconicase') => ' 12°piano ',
__(' 13th floor, ','sacconicase') => ' 13°piano ',
__(' 14th floor, ','sacconicase') => ' 14°piano ',
__(' 15th floor, ','sacconicase') => ' 15°piano ',
__(' roof-floor, ','sacconicase') => ' mansarda',
 );

    echo '<select name="piano">';
    echo '<option value=""' . ((($value == '') || !isset($piani[$value])) ? ' selected="selected"' : '') . '> ----</option>';

    // output each floor as an option
    foreach ($piani as $id => $text) {
        echo '<option value="' . $id . '"' . (($value == $id) ? ' selected="selected"' : '') . '">' . $text. '</option>';
    }
    echo '</select>';

    echo '</span></div>';
}

add_action( 'save_post', 'save_metadata');

function save_metadata($postid)
{
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return false;
    if ( !current_user_can( 'edit_page', $postid ) ) return false;
    if( empty($postid) ) return false;


    if ( is_null($_REQUEST["piano"]) ) {
        delete_post_meta($postid, 'piano');
    } else {
        update_post_meta($postid, 'piano', $_REQUEST['piano']);
    }

}
// END FLOOR OF THE APARTMENT