Select a random photo from a user's account

random-photo.php

// instantiate the API wrapper
$op = new OpenPhotoOAuth($host, $consumerKey, $consumerSecret, $oauthToken, $oauthSecret);

// call the list API with a limit of 1 photo and access the 'totalPages' property
$result = json_decode($op->get('/photos/list.json', array('pageSize' => '1')), 1);
$totalPhotos = intval($result['result'][0]['totalPages']);

// pick a random number between the first and last photo
$randomPage = rand(1, $totalPhotos);

// make another API call to get the random photo
$result = json_decode($op->get('/photos/list.json', array('pageSize' => '1', 'page' => $randomPage, 'returnSizes' => '800x800', 'generate' => 'true')), 1);
$photo = $result['result'][0];