PHP: WordPress exclude selected page childs from parents

php-exclude-page-childs.php

<?php 
						$toexclude = array(21, 23);
						$parents = array(13);
						$exclude_list = '';

						foreach ($parents as $key => $parent) {
							$args=array(
						  		'child_of' => $parent
							);
							$pages = get_pages($args);
							if ($pages) {
						  		foreach ($pages as $page) {
						    		$toexclude[]= $page->ID;
						  		}
							}
						}
						$exclude_list = implode(',', $toexclude);
						
						$args=array(
							'title_li' => '',
							'depth' => 2,
						    'exclude' =>  $exclude_list
						);
						wp_list_pages($args);
						
						?>