Today the lesson is simple and I think many already know how, but those who do not know how to work with a database in WordPress and those who can benefit from this topic, I think, will appreciate it.

Get page id by page name. This is quite easy to do if you know how to query the database.. Adding a code snippet to a file functions.php your template WordPress.

function wds_get_ID_by_page_name($page_name)
{
        global $wpdb;  
	$page_name = strip_tags($page_name);
	$page_name = addslashes($page_name);
        $page_name_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE post_title ='".$page_name."'");
         return $page_name_id;
}

You can display the page ID in any part of the template using the following code snippet.

<?
        $the_page_id = wds_get_ID_by_page_name('PAGE_NAME');
        echo $the_page_id;
?>

Don't forget to change PAGE_NAME to your page name, whose id you would like to return. Good luck in website development.