SOAP makes my head hurt. Let's look at some stuff we can all actually understand instead.

Take a pinch of RSS
<?php
$url 
'http://buzz.yahoo.com/feeds/buzzoverl.xml';
$xml = @simplexml_load_file($url);
if(
$xml) {
  foreach(
$xml->channel->item as $item) {
    
$ret[(string)$item->title] = (string)$item->link;
  }
  echo 
"<pre>"print_r($ret); echo "</pre>";
} else echo 
"Can't get to Yahoo!";
?>
Output
Can't get to Yahoo!
Add a spoonful of REST
<?php
$srv
='http://api.search.yahoo.com/ImageSearchService/V1/imageSearch';
foreach(
$ret as $key=>$link) {
  
$url $srv "?query=$key&appid=RESTDemo";
  
$obj simplexml_load_file($url);
}
?>
A thimble of gradeschool math
x^2/a^2 + y^2/b^2 = 1
And we end up with something like this

http://buzz.progphp.com

By the way, throwing a cache layer between you and whatever remote service you are accessing tends to be a good idea. In our case we can do it like this:

<?php
$tmp 
'/tmp/'.md5($q);
if(!
file_exists($tmp) || filemtime($tmp) < (time()-7200)) {
   
$stream fopen($url,'r');
   
$tmpf tempnam('/tmp','YWS');
   
file_put_contents($tmpf$stream);
   
fclose($stream);
   
rename($tmpf$tmp);
}
$obj simplexml_load_file($tmp);
?>