Tabelle wird nicht geschrieben

[liebewinter]

hallo , ich habe das probleme die Tabelle wird nicht gebaut , auch bekomme keine Name , Email und Message auf meine datei ClassProveContakt2.php , der screenshot was auf dieser datei bekomme..

Der Code von ClassProveContakt2.php ;

<?php
require_once 'ClassProveContakt3.php';
error_reporting(E_ALL);

$mella = new ClassProveContakt3();


$mella -> ShowData();  
   

Die Datei ClassProveContakt3.php wo meine ganze Code habe ;

<?php

header('Content-Type: text/html; Charset=utf-8');
mb_internal_encoding('UTF-8');
date_default_timezone_set('Europe/Berlin');
error_reporting(E_ALL);


class ClassProveContakt3 
{

      private $Name;
      private $Email;
      private $Message;
      private $PostOK = false;
      private $DateTime = false;
      private $items = false; 

 
    function __construct() 
    {

 
         $this -> DateTime = date('m/d/Y h:i:s a');  
         $this -> items = ['Name', 'Email', 'Message']; 
          
         $flag = true;
         foreach ( $this -> items as $key ) {  
			           if ( empty ( $_POST[$key] ) )  {
			             $flag = false;    
			           } else {    
			             $this -> $key = trim( filter_var( $_POST[$key], FILTER_SANITIZE_STRING ) );
			            }    
		   }	    
         $this -> PostOk = $flag; 
    }

 
    

  
    function ShowForm() 
     {

     


        echo ('<form method="POST">');

 
                    echo('<label for="name">Name </label>');

 

                    echo('<input type="text" name="Name" value="'.$this->Name.'">');

 

                    echo('<label for="email"> E-mail </label>');

 

                    echo('<input type="email" value="'.$this->Email.'" name="Email" ');

 

 

              echo('<tr>');

 

                 echo('<td>');

                     echo('<br><br>');

                     echo('<label> Message: <br><textarea cols="45" rows="6" name="Message">'.$this->Message.'</textarea></label>');

                     echo('<br><br>');

                     echo('<input  type="submit" name="post" value="POST COMMENT" id="comment">');

 

                 echo('</td>');

 

               echo('</tr>');

 

         echo('</form>');

 
      }

   
  
       
       
      function PostOkT() 
      {

     
              
        

 
               if ($this -> PostOK) 
               {
              
                  return;
               } 
                   if (empty($this->Name) ||  empty($this->Email) || empty($this->Message))
                   {
                   
                       echo "<br>" . "<b>" . "<h3>*** Please enter all required fields ***</h3>" . "</b>";  
               
                  
                   }

          
                   else 
                   {
                   
                   	
                      
                       
                       $file = "test.txt"; 
                       
                       
                       $name = filter_input( INPUT_POST, 'Name', FILTER_SANITIZE_STRING);
                       $email = filter_input(INPUT_POST, 'Email', FILTER_SANITIZE_STRING);
                       $message = filter_input(INPUT_POST, 'Message', FILTER_SANITIZE_STRING);
                       $datetime = date('m/d/Y h:i:s a', time());
                       
                       $data = array("name" => $name, "email" => $email, "message" => $message, "datetime" => $datetime);
    	   
    			           $data = serialize($data);
    		              file_put_contents($file, $data . "\n", FILE_APPEND|LOCK_EX);
                       
                       
                       $messages = file($file);
                      
    		              foreach ($messages as $value) {
    		                $data = unserialize($value);
    				                  
        
                                  
                                  echo "<br>"

                                      . "<b>From: </b>" . htmlspecialchars( $data["name"])
                                      . "<b> at: </b>" . htmlspecialchars( $data["datetime"])
                                      . "<br><br>" . htmlspecialchars( $data["email"])                                     
                                      . "<br><br>" . htmlspecialchars( $data["message"])
                                      . "<br><hr>";
        
                       }
               
                    }

       }
       

       function ShowData() {
      
          
         
          
             $ShowItems = $this -> items; 
             array_unshift( $ShowItems, 'DateTime' ); 
             
             echo "<table><tr>";
             foreach ( $ShowItems as $ColName ) {
                 echo"<th>" . htmlspecialchars( $ColName ) . "</th>"; 
             echo "</tr><tr>";
             }
             foreach ( $ShowItems as $ColName ) {
    			      echo"<td>" . htmlspecialchars( $this -> $ColName ) . "</td>"; 
    	       }
             echo "</tr></table>";
                    
               
       
       }
       

}       
      
            
?>

Auf meine Webformular Seite bekomme alles in Ordnung , wie der Screenhot zeigt...