Sorry for the late 
Adding a "send message to all users" option:
 - Go to your database, and select your news table.
 
- At the top, if you are using phpMyAdmin, select to edit the table's structure.
 
- At the bottom you will see an "Add (1) columns..." click execute
 
- Create a new columns like this:
-  Name: allowmessage
 
-  Type: varchar
 
-  Size: 3
 
-  Predefined: As defined -> "no"
 
-  Select "Null" checkbox
 
  
- Go to your class_news.php file and change it to this: (new stuff is commented with "NEW!")
 
	PHP Code: 
	
		
			
<?php
 
 use Resource\Native\Object;
 use Resource\Native\Arrays;
 
 class News extends Object {
 
 
     private $id;
     private $user;
     private $title;
     private $content;
     private $date;
     private $posted;
     private $comments;
     private $allowcomment;
     private $allowmessage;//NEW!
 
      public function __construct($id){
          $mysidia = Registry::get("mysidia");
          $whereClause = "id = '{$id}'";
          $row = $mysidia->db->select("news",array(),$whereClause)->fetchObject();
          if(!is_object($row)) throw new NoPermissionException("News doesn't exist");
          foreach($row as $key => $val){
                     $this->$key = $val;              
             }
             $this->comments = $mysidia->db->select("newscomments",array("id"),"newsID = {$this->id} ORDER BY date,id");    
         }
         
         public function getID(){
             return $this->id;
     }
     
     public function getUser(){
         return $this->user;
     }
     
     public function getUserObject(){
         $mysidia = Registry::get("mysidia");
         $user = new Member($this->user);
         return $user;
     }
     public function getTitle(){
         return $this->title;
     }
     
     public function getContent(){
         return $this->content;
     }
     
     public function getDate(){
         return $this->date;
     }
     
     public function getPosted(){
         return $this->posted;
     }
     
     public function getAllowComment(){
         return $this->allowcomment;
     }
 
 //NEW!
     public function getAllowMessage(){
         return $this->allowmessage;
     }
         
     public function changeAllowComment($allow){
         $mysidia = Registry::get("mysidia");
         if($this->allowcomment != $allow){
             $this->allowcomment = $allow;
             $mysidia->db->update("news",array("allowcomment" => $this->allowcomment),"id = {$this->id}");
         }
         
     }
 
 //NEW!
     public function changeAllowMessage($allow){
         $mysidia = Registry::get("mysidia");
         if($this->allowmessage != $allow){
             $this->allowmessage = $allow;
             $mysidia->db->update("news",array("allowmessage" => $this->allowmessage),"id = {$this->id}");
         }
         
     }
         
     public function addComment($content,$date,$user){
         $mysidia = Registry::get("mysidia");
         $mysidia->db->insert("newscomments",array("comment" => $this->format($content), "date" => $date, "userID" => $user, "newsID" => $this->id));
         $this->comments = $mysidia->db->select("newscomments",array("id"),"newsID = {$this->id} ORDER BY date,id");
     }
     
     private function format($text){
              $text = html_entity_decode($text);
              $text = stripslashes($text);
              $text = str_replace("rn","",$text);
              return $text;
         }
     
     public function saveDraft(){
         $mysidia = Registry::get("mysidia");
         $todayDate = $this->todayDate();
         if($this->date != $todayDate) $this->newDate($todayDate);
         $this->posted = "no";
         $mysidia->db->update("news",array("posted" => $this->posted),"id = {$this->id}");
     }
     
     public function post(){
         $mysidia = Registry::get("mysidia");
         $todayDate = $this->todayDate();
         if($this->date != $todayDate) $this->newDate($todayDate);
         $this->posted = "yes";
         $mysidia->db->update("news",array("posted" => $this->posted),"id = {$this->id}");
 //NEW!
         if($this->allowmessage == "yes")
             $this->sendToAllUsers($todayDate);
     }
  
 //NEW!       
         public function sendToAllUsers($dateToday) {
                 $mysidia = Registry::get("mysidia");
         $allusers = $mysidia->db->select("users", array("username"), "");        
         $messageTitle = "Update";
         $messagetext = "A new news was posted on the site! Click <a href='/news'>here</a> to view!<br>";
         
         while($user = $allusers->fetchColumn()){
             $mysidia->db->insert("messages", array("fromuser" => "SYSTEM", "touser" => $user, "status" => "unread", "datesent" => $dateToday, "messagetitle" => $messageTitle, "messagetext" => $messagetext), ""); 
         }
            }
            
         public function editContent($content){
             $mysidia = Registry::get("mysidia");
             $this->content = $content;
             $mysidia->db->update("news",array("content" => $this->content),"id = {$this->id}");
         }
         
         public function editTitle($title){
              $mysidia = Registry::get("mysidia");
             $this->title = $title;
             $mysidia->db->update("news",array("title" => $this->title),"id = {$this->id}");
         }
         
         public function todayDate(){
             $dateTime = new DateTime;
             $date = $dateTime->format('Y-m-d H:i:s');
             return $date;
         }
         public function newDate($date){
             $mysidia = Registry::get("mysidia");
             $this->date = $date;
             $mysidia->db->update("news",array("date" => $this->date),"id = {$this->id}");
         }
         
         public function getCommentNumber(){
             $count = $this->comments->rowCount();
             return $count;
         }
         
         public function getComments(){
             return $this->comments;
         }
         
 }
 
 ?>
		
	 
  
- Go to your newsview.php file inside the admincp folder and change it to this: (new stuff is commented with "NEW!")
 
	PHP Code: 
	
		
			
<?php
 
 use Resource\Native\String;
 use Resource\Collection\LinkedList;
 use Resource\Collection\LinkedHashMap;
 
 class ACPNewsView extends View{
     
     private $editor;
     
     public function index(){
         //parent::index();
         $mysidia = Registry::get("mysidia");
         $document = $this->document;    
         $document->setTitle("Manage News And Comments");
         
         $pagesTable = new TableBuilder("news");
         $pagesTable->setAlign(new Align("center", "middle"));
         
         $pagesTable->buildHeaders("News Title", "Author", "Date", "Edit", "Publish/Save", "Delete", "View Comments", "View News");
         
         $allnews = $this->getField("news")->get();
         
         if($mysidia->input->post("submit")){
             $id = $mysidia->input->post("submit");
             $newsObj = new News($id);
             $newsObj->saveDraft();
             $document->add(new Comment("<b>Successfully saved news as draft</b>",TRUE));            
         }
         
         if($mysidia->input->post("submit1")){
             $id = $mysidia->input->post("submit1");
             $newsObj = new News($id);
             $newsObj->post();
             $document->add(new Comment("<b>Successfully added and published news.</b>",TRUE));
         }
         
         if($mysidia->input->post("submit2")){
             $id = $mysidia->input->post("submit2");
             $newsObj = new News($id);
             $document->add(new Comment("Are you sure you wish to delete this news?",TRUE));
             $form = new Form("title","","post");
             $form->add(new Button("Yes","submit5",$id));
             $document->add($form);        
             
         }
         if($mysidia->input->post("submit5")){
             $id = $mysidia->input->post("submit5");
             $mysidia->db->delete("news","id = {$id}");
             $document->add(new Comment("Successfully deleted news",TRUE));
             $allnews = $mysidia->db->select("news",array("id"),"");
         }
             
         while($news = $allnews->fetchColumn()){
             $newsObj = new News($news);
             $cells = new LinkedList;
             ($newsObj->getPosted() == "yes")? $draft = "":$draft = "(draft)";
             $title = "{$newsObj->getTitle()} {$draft}";
             $cells->add(new TCell($title));
             $cells->add(new TCell($newsObj->getUserObject()->getUsername()));
             $cells->add(new TCell($newsObj->getDate()));
             $cells->add(new TCell(new Link("admincp/news/edit/{$news}","Edit")));
             
             $form = new Form("title","","post");
             $form->add(new Button("Save As Draft","submit",$news));
             $form2 = new Form("title","","post");
             $form2->add(new Button("Publish","submit1",$news));
             $form3 = new Form("title","","post");
             $form3->add(new Button("Delete","submit2",$news));
                     
             ($newsObj->getPosted() == "yes")? $cells->add(new TCell($form)) : $cells->add(new TCell($form2));
             $cells->add(new TCell($form3));
             $cells->add(new TCell(new Link("admincp/news/viewcomments/{$news}","View Comments")));
             $cells->add(new TCell(new Link("news/view/{$news}","View News On Site")));
             $pagesTable->buildRow($cells);    
         }
         
         $document->add($pagesTable);
         $document->add(new Comment("<a href='/admincp/news/create'>Create</a>",TRUE));
        
     }
     
     public function viewcomments(){
         $mysidia = Registry::get("mysidia");
         $document = $this->document;
         $document->setTitle("editing comments");
         $news = $this->getField("news");
         
         $newsComments = $news->getComments();
         
         
         $pagesTable = new TableBuilder("news");
         $pagesTable->setAlign(new Align("center", "middle"));
         
         $pagesTable->buildHeaders("Author", "Date", "Content", "Edit", "Delete");
         
         if($mysidia->input->post("submit")){
             $document->add(new Comment("Are you sure you wish to delete this comment?",FALSE));
             $id = $mysidia->input->post("submit");
             $form = new Form("title","","post");
             $form->add(new Button("Yes","submit2",$id));
             $document->add($form);
 
         }
                     
         if($mysidia->input->post("submit2")){
                 $id = $mysidia->input->post("submit2");
                 //echo $id;
                 $mysidia->db->delete("newscomments","id = {$id}");
                 $document->add(new Comment("<b>Comment deleted successfully.</b>",FALSE));
                 $news = $this->getField("news2");
                 $newsComments = $news->getComments();
         }
             
         while($newsID = $newsComments->fetchColumn()){
             try{
                 $newsComment = new NewsComments($newsID);
                 $cells = new LinkedList;
                 $cells->add(new TCell($newsComment->getUserObject()->getUsername()));
                 $cells->add(new TCell($newsComment->getDate()));
                 $cells->add(new TCell($newsComment->getContent()));
                 $cells->add(new TCell(new Link("admincp/news/editcomment/{$newsComment->getID()}","Edit")));
                 $form = new Form("form","","post");
                 $form->add(new Button("Delete","submit",$newsID));
                 $cells->add(new TCell($form));
                 $pagesTable->buildRow($cells);
             }
             catch(NoPermissionException $e){
                 
             }
             
         }
         
         $document->add($pagesTable);
     }
     
     public function editcomment(){
         $mysidia = Registry::get("mysidia");
         $document = $this->document;
         $document->setTitle("editing comments");
         $newsComment = $this->getField("newscomments");
         $editor = $this->getField("editor")->get();
         
         if($mysidia->input->post("submit")){
                 $newsComment->setContent($mysidia->input->post("commentcontent"));
                 $document->add(new Comment("<b>Edited news comment successfully. Text displayed is the old one.<br></b>",FALSE));
                 $newsComment = $this->getField("newscomments");
                 $editor = $this->getField("editor")->get();
         }
         
         $document->add(new Comment("Author: {$newsComment->getUserObject()->getUsername()} / Date: {$newsComment->getDate()}",FALSE));
         $form = new Form("form","","post");
         
         $form->add(new Comment($editor,FALSE));
         $form->add(new Button("Submit","submit","submit"));
         $document->add($form);
     }
     
     public function edit(){
     
         
         //include_once("../inc/ckeditor/ckeditor.php");     
         $mysidia = Registry::get("mysidia");
             //$this->editor = new CKEditor;    
             //$this->editor->basePath = '../../../inc/ckeditor/';
         $document = $this->document;
         $document->setTitle("Edit");
         
         
             $news = $this->getField("news");
                     
             if($mysidia->input->post("submit")){
             /*if(!$mysidia->input->post("newstitle")) throw new BlankFieldException("No title");
             if(!$mysidia->input->post("newscontent")) throw new BlanKFieldException("No content");*/
             
             ($mysidia->input->post("allowcomments"))?$allow = "yes":$allow = "no";
 //NEW!
             ($mysidia->input->post("allowmessage"))?$allowM = "yes":$allowM = "no";
             
             $news->editTitle($mysidia->input->post("newstitle"));
             $news->editContent($this->format($mysidia->input->post("pagecontent")));
             $news->changeAllowComment($allow);
 //NEW!
             $news->changeAllowMessage($allowM);
             
             if($mysidia->input->post("submit") == "submitDraft"){
                 $news->saveDraft();
             }
             
             else{
                 $news->post();
             }
             $document->add(new Comment("<b>Successfully changed news.</b>"));
         }
         
         $editor = $this->getField("editor")->get()->editor("pagecontent", $this->format($news->getContent()));
         $form = new Form("title","","post");
         $form->add(new Comment("<b>Date</b>:{$news->getDate()} and <b>Author</b>: {$news->getUserObject()->getUsername()} and <b>Published</b>: {$news->getPosted()}"));
         $form->add(new Comment("<b>Title</b>:"));
         $form->add(new TextField("newstitle",$news->getTitle()));
         $form->add(new Comment("<b>Contents</b>:"));
         $form->add(new Comment($editor));
         $comments = new CheckBox("Allow comments on this news", "allowcomments", 1, "array");
         if($news->getAllowComment() == "yes")
             $comments->setChecked("allowcomments");
         $comments2 = new CheckBox("Send message to all users notifying about the existence of an update", "allowmessage", 2, "array");
         $form->add($comments);
         $form->add($comments2);
         $form->add(new Button("Save as draft","submit","submitDraft"));
         $form->add(new Button("Publish","submit","submitPublish"));
         $document->add($form);
         
         //echo $mysidia->user->uid;
     
     }
     
     public function create(){
         $mysidia = Registry::get("mysidia");
         $document = $this->document;
         $document->setTitle("Create");
         
         if($mysidia->input->post("submit")){
             $todayDate = new DateTime;
             //H:i:s
             $todayDate->setTimezone(new DateTimeZone('Europe/London'));
             $date = $todayDate->format('Y-m-d H:i:s');
             /*if(!$mysidia->input->post("newstitle")) throw new BlankFieldException("No title");
             if(!$mysidia->input->post("newscontent")) throw new BlanKFieldException("No content");*/
         
             ($mysidia->input->post("allowcomments"))?$allow = "yes":$allow = "no";
             ($mysidia->input->post("allowmessage"))?$allowM = "yes":$allowM = "no";
                 
             
             if($mysidia->input->post("submit") == "submitDraft"){
                             
             $mysidia->db->insert("news",array("title" => $mysidia->input->post("newstitle"), "content" => $this->format($mysidia->input->post("pagecontent")), "user" => $mysidia->user->uid, "date" => $date, "posted" => "no","allowcomment" => $allow, "allowmessage" => $allowM));
             }
             
             else{
                             
             $mysidia->db->insert("news",array("title" => $mysidia->input->post("newstitle"), "content" => $this->format($mysidia->input->post("pagecontent")), "user" => $mysidia->user->uid, "date" => $date, "posted" => "yes","allowcomment" => $allow, "allowmessage" => $allowM));
             
                 if($mysidia->input->post("allowmessage")){
 //NEW!
                     $allusers = $mysidia->db->select("users", array("username"), "");
                     
                     $today = new DateTime;
                     $dateToday = $today->format('Y-m-d');
                     $messageTitle = "Update";
                     $messagetext = "A new news was posted on the site! Click <a href='/news'>here</a> to view!<br>";
                     
                     while($user = $allusers->fetchColumn()){
                         $mysidia->db->insert("messages", array("fromuser" => "SYSTEM", "touser" => $user, "status" => "unread", "datesent" => $dateToday, "messagetitle" => $messageTitle, "messagetext" => $messagetext), ""); 
                     }
                 
                 }
             }
             $document->add(new Comment("<b>Successfully changed news. Fill this page again to create a new post. Click <a href='/news' target='_blank'>here</a> to see the news page.</b>"));
         }
         $todayDate = new DateTime;
         $date = $todayDate->format('Y-m-d');
         $editor = $this->getField("editor")->get();
         $form = new Form("title","","post");
         $form->add(new Comment("<b>Date</b>:{$date} and <b>Author</b>: {$mysidia->user->username} and <b>Published</b>: No"));
         $form->add(new Comment("<b>Title</b>:"));
         $form->add(new TextField("newstitle",""));
         $form->add(new Comment("<b>Contents</b>:"));
         $form->add(new Comment($editor));
         $comments = new CheckBox("Allow comments on this news", "allowcomments", 1, "array");
         $comments2 = new CheckBox("Send message to all users notifying about the existence of an update", "allowmessage", 2, "array");
         $form->add($comments);
         $form->add($comments2);
         $form->add(new Button("Save as draft","submit","submitDraft"));
         $form->add(new Button("Publish","submit","submitPublish"));
         $document->add($form);
     }
     
         private function format($text){
          $text = html_entity_decode($text);
          $text = stripslashes($text);
          $text = str_replace("rn","",$text);
          return $text;
     }
 }
 ?>
		
	 
  
 
		 
		
		
		
		
		
		
			
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