add-html-wordpress

<?php
function add_html_pages_permalink() {
   global $wp_rewrite;
   if ( !strpos($wp_rewrite->get_page_permastruct(), ".html")){
      $wp_rewrite->page_structure = $wp_rewrite->page_structure . ".html"; $wp_rewrite->flush_rules();
   }
}//end add_html_pages_permalink
add_action('init', 'add_html_pages_permalink', -1);
function add_html_pages_no_page_slash($string, $type){
   global $wp_rewrite;
   if ($wp_rewrite->using_permalinks() && $wp_rewrite->use_trailing_slashes==false && $type == 'page' ){
      return untrailingslashit($string);
   } else{
      return $string;
  }
}//end add_html_pages_no_page_slash
add_filter('user_trailingslashit', 'add_html_pages_no_page_slash',66,2);
function add_html_pages_activate() {
   global $wp_rewrite;
   if ( !strpos($wp_rewrite->get_page_permastruct(), ".html")){
      $wp_rewrite->page_structure = $wp_rewrite->page_structure . ".html";
   }
  $wp_rewrite->flush_rules();
}//end add_html_pages_activate
register_activation_hook(__FILE__, 'add_html_pages_activate');
function add_html_pages_deactivate() {
   global $wp_rewrite;
   $wp_rewrite->page_structure = str_replace(".html","",$wp_rewrite->page_structure);
   $wp_rewrite->flush_rules();
}//end add_html_pages_deactivate
register_deactivation_hook(__FILE__, 'add_html_pages_deactivate');
?>