wp_get_post_by_slug.php

<?php
function get_post_by_slug($slug) {
  $args = array(
    'name'           => $slug,
    'post_type'      => 'page',
    'post_status'    => 'publish',
    'posts_per_page' => 1,
  );
  $found_posts = get_posts($args);
  if ( count($found_posts) > 0 ) {
    return $found_posts[0];
  }
  return false;
}