PHP 5 → 4 converter

<?php
// Declare the interface 'iTemplate'
/* interface iTemplate */

// Implement the interface
// This will work
class Template /* implements iTemplate */
{
   var $vars = array(); /* private */

   function setVariable($name, $var)
   {
       $this->vars[$name] = $var;
   }

   function getHtml($template)
   {
       foreach($this->vars as $name => $value) {
           $template = str_replace('{' . $name . '}', $value, $template);
       }

       return $template;
   }
}

// This will not work
// Fatal error: Class BadTemplate contains 1 abstract methods
// and must therefore be declared abstract (iTemplate::getHtml)
class BadTemplate /* implements iTemplate */
{
   var $vars = array(); /* private */

   function setVariable($name, $var)
   {
       $this->vars[$name] = $var;
   }
}

?>