Search Flickr by username using REST

Searching flickr users by username can be done simply using REST services provided by flickr. Following is a beginning but complete
code that search for a username in flick using REST service of flickr.

     //REST url for flickr
     $url = "http://api.flickr.com/services/rest";
     $data = array(
           "username" => "sudhi",
           "method" => "flickr.people.findByUsername",
           "api_key" => "ur_api_key_here"
     );
     //this is the query string initialization
     $q = http_build_query($data);
     $finalUrl = $url."?".$q;
     //initialize curl
     $ch = curl_init($finalUrl);
     //return the response as string
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
     //execute the curl
     $result = curl_exec($ch);
     //use simpleXml for parsing the xml response
     $xmlStr = simplexml_load_string($result);
     foreach($xmlStr->user as $people) {
         $attrs = $user->attributes();
         //ths $attrs contains user information
         echo "
";
         print_r($attrs);
         echo "
";
     }