yql_flickr_search.php

<?php
$yql_url = 'http://query.yahooapis.com/v1/public/yql?';
$query = 'SELECT * FROM flickr.photos.search WHERE has_geo="true" AND text="san francisco"';
$query_url = $yql_url . 'q=' . urlencode($query) . '&format=xml';

$photos = simplexml_load_file($query_url);
$result = build_photos($photos->results->photo);
echo $result;

function build_photos($photos){
    $html = '<ul>';
    if (count($photos) > 0){
        foreach ($photos as $photo){
            $html .= '<li><a href="http://www.flickr.com/photos/'.
                     $photo['owner'].'/'.$photo['id'].
                     '"><img src="http://farm'.$photo['farm'].
                     '.static.flickr.com/'.$photo['server'].
                     '/'.$photo['id'].'_'.$photo['secret'].
                     '.jpg" width="75" height="75" alt="'.$photo['title'].
                     '" /></a></li>';
        }
    } else {
        $html .= 'No Photos Found';
    }
    $html .= '</ul>';
    return $html;
}
?>