Вроде так:

<?php
$open = opendir($_SERVER[\'DOCUMENT_ROOT\'].\'/dirname/dirname2/\');
while(($file = readdir($open) == true){
if($file != \'.\' && $file != \'..\'){
$pathinfo = pathinfo($file);
if($file[\'extension\'] == \'php\'){
include $_SERVER[\'DOCUMENT_ROOT\'].\'/dirname/dirname2/\'.$file;
}
}
}
?>