WP-Members メンバーシップによるアクセス制限

サンプルコードを書いてみました。無理やり感半端ないので、参考までということで……

add_action( 'wpmem_after_admin_init', function() {
	global $wpmem;

	remove_action( 'wpmem_admin_after_block_meta', array( $wpmem->membership->admin, 'add_product_to_post' ), 10, 2 );
	add_action( 'wpmem_admin_after_block_meta', 'my_add_product_to_post', 10, 2 );
} );

// WP_Members_Products_Admin::add_product_to_post()
function my_add_product_to_post( $post, $block ) {
	global $pagenow, $wpmem;

	$is_new = ( 'post-new.php' === $pagenow );

	$product = $wpmem->membership->get_post_products( $post->ID );
	$product = ( $product ) ? $product : array();
	$values[] = __( 'None', 'wp-members' ) . '|';

	$pages = get_pages( array( 'post_type' => 'wpmem_product', 'sort_column' => 'menu_order, post_title' ) );
	foreach ( $pages as $page ) {
		if ( $is_new ) {
			if (
				isset( $wpmem->membership->products[$page->post_name]['set_default_' . $post->post_type] )
				&& 1 == $wpmem->membership->products[$page->post_name]['set_default_' . $post->post_type]
			) {
				$product[] = $page->post_name;
			}
		}
		$values[] = $page->post_title . '|' . $page->post_name;
	}

	echo wpmem_form_label( array( 
		'meta_key' => $wpmem->membership->post_meta,
		'label' => __( 'Restrict access by membership:', 'wp-members' ),
		'type' => 'multiselect'
	) );
	echo "<br />";
	echo wpmem_form_field( array( 
		'name' => $wpmem->membership->post_meta, 
		'type' => 'multiselect',
		'value' => $values,
		'compare' => $product,
		'class' => 'wpmem-product-select2 populate placeholder',
	) );
}