session_start();



if ( !$_SESSION['key'] )

{



  $alphabet = 'abcdefghiklmnopqastuvwxyz';



  for ( $i = 0; $i < 10; $i++ )

  {

  

    if ( rand( 0, 1 ) == 0 )

    {

    

      $_SESSION['key'] .= rand( 1, 9 );

    

    }

    else

    {

    

      if ( rand( 0, 1 ) == 0 )

      {

      

        $_SESSION['key'] .= strtolower( $alphabet[rand( 0, 24; )] );

  

      }

      else

      {

      

        $_SESSION['key'] .= strtoupper( $alphabet[rand( 0, 24; )] );

      

      }

  

    }

  

  }

  

}



if ( $_POST['text'] && $_POST['key'] )

{



  if ( !$_POST['key'] OR $_POST['key'] != $_SESSION['key'] ) $errors[] = 'Ошибка сессии!';

  if ( !$_POST['text'] ) $errors[] = 'Ошибка, введите текст сообщения!';



  if ( $errors )

  {

  

    foreach ( $errors as $error )

    {

    

    

      echo $error . '<br/>';

    

    }

    

  }

  else

  {

  

  

  

  }



}

else

{



  echo '<form action='?' . session_name() . '=' . session_id() . '' method='post'>

    Сообщение:

    <br/>

    <input type='text'   name='text'/>

    <br/>

    <input type='hidden' name='key' value='' . $_SESSION['key'] . ''/>

    <br/>

    <input type='submit' value='Отправить'/>

  </form>';



}