Get ID from Page Name. Add this to functions.php file and you can use this function in templates when you need an ID of a specific post/page and all you have is the name.
<?php
function get_ID_by_page_name($page_name) {
global $wpdb;
$page_name_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE post_name = '".$page_name."' AND post_type = 'page'");
return $page_name_id;
}
?>