Look at how the quick search drop down is populated in the Confluence search box - it delivers JSON to build the drop down menu.
Use a similar approach to query that same URL for your Wordpress search integration. You can use Firebug or Google Chrome developer tools to watch the network requests.
This approach means that you're just querying the available APIs - you won't have to add the "Powered by..." text.
Update:
This scrappy bit of working PHP code will add Confluence search results to a PHP page:
<!DOCTYPE html>
<html>
<head>
<title>Search</title>
</head>
<body>
<h1>Search Atlassian's documentation</h1>
<form>
<input name="q" placeholder="Search Confluence...">
<input type="submit">
</form>
<?php if (isset($_GET['q'])) {
$query = rawurlencode( $_GET['q']);
$timestamp = time();
$baseUrl = 'http://confluence.atlassian.com';
$url = $baseUrl.'/json/contentnamesearch.action?query='.$query.'&_='.$timestamp;
$response = file_get_contents($url);
$response = json_decode($response);
$results = $response->contentNameMatches[0];
?>
<h2>Results</h2>
<div>Searching: <?php echo $url; ?>
<h3>Formatted</h3>
<ol>
<?php foreach($results as $item) {?>
<li><strong><a href="<?= $baseUrl. $item->href ?>"><?= $item->name ?></a></strong> in <a href="<?= $baseUrl.'/display/'.$item->spaceKey ?>"><?= $item->spaceName ?></a></li>
<?php } ?>
</ol>
<h3>Raw JSON</h3>
<pre>
<?php print_r($response); ?>
</pre>
<?php } ?>
</body>
</html>
Clean it up with some error handling though. Also, take a look at the source code of contentnamesearch.action to get it to return more than 6 results ;)
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