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){
    $html = '';
    if (count($photos) > 0){
        foreach ($photos as $photo){
            $html .= "<a href='http://www.flickr.com/photos/{$photo['owner']}/{$photo['id']}' target='_blank'><img src='http://farm4.static.flickr.com/{$photo['server']}/{$photo['id']}_{$photo['secret']}.jpg' width='75' height='75' alt='flickr photo' /></a>";
        }
    } else {
        $html .= 'No Photos Found';
    }
    return $html;
}
?>