<?php

class A
{

   public function add ($element)
   {
   
      if (!$this->readOnly)
      {
         
         $this->size = $this->elements->getLength() + 1;

         $new_elements = new Elements($this->size);

         for ($i = 0; $i < $this->size; $i++)
         {
           $new_elements->setIndex($i, $this->elements->getIndex($i));
         }         
         
         $this->elements = $new_elements;
         
         $this->elements->setIndex($this->size, $element);
         
      }
      
   }
   
}