naranissin

<?php
/** 
 * Register new status
 * Tutorial: http://www.sellwithwp.com/woocommerce-custom-order-status-2/
**/
function register_awaiting_shipment_order_status() {
    register_post_status( 'wc-awaiting-shipment', array(
        'label'                     => 'Awaiting shipment',
        'public'                    => true,
        'exclude_from_search'       => false,

naranissin

/////////以下、function.phpへの追記箇所///////////


//出欠確認
add_filter('the_content', 'join_check');
function join_check($content){

	//選択肢をここで設定
	$key_select = array("参加","保留","不参加");
	$ret="";