phpeveryday.com

<?php
$arr = array('server-side',
             array('PHP', 'ASP'),
			 'client-side',
			 array('HTML', 'JavaScript','VBScript'),
			 array('desktop'=>array('VB','Delphi'))
            );


$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr));

foreach($iterator as $value){
 echo $value." ";
}
// result server-side PHP ASP client-side HTML JavaScript VBScript VB Delphi
?>