[WordPress] Retrieve Flickr Photos in WordPress

00-curl-helper.php

<?php

/**
 * Defines and wrap an instance of the cURL library to retrieve information from
 * the specified URL.
 *
 * @param      string    $string  The URL from which to retrieve information.
 * @return               $data    The data retrieved from the incoming URL.
 */
function acme_curl( $url ) {

	$ch = curl_init( $url );

	curl_setopt( $ch, CURLOPT_RETURNTRANSFER, TRUE );
	curl_setopt( $ch, CURLOPT_HEADER, 0 );
	curl_setopt( $ch, CURLOPT_USERAGENT, '' );
	curl_setopt( $ch, CURLOPT_TIMEOUT, 10 );

	$data = curl_exec($ch);
	if ( 0 !== curl_errno( $ch ) || 200 !== curl_getinfo($ch, CURLINFO_HTTP_CODE ) ) {
		$data = FALSE;
	}
	curl_close( $ch );

	return $data;

}

01-get-user-id.php

<?php

/**
 * @return     string    $user_id    The ID of the user that corresponds to the username specified in the customizer.
 */
function acme_get_flickr_user_id() {

	$flickr_username = get_theme_mod( 'acme_flickr_username' );

	$response = acme_curl( 'https://api.flickr.com/services/rest/?method=flickr.people.findByUsername&api_key=YOUR_API_KEY&username=' . $flickr_username );
  $oXML     = simplexml_load_string( $response );

  $user_id = $oXML->user['id'];

  echo $user_id;

}

02-load-the-photos.php

<?php
/**
 * Renders the most recent photos from the specified Flickr account.
 * in `index.php`.
 *
 * @package    Acme
 */
?>
<div id="flickr">
	<script type="text/javascript" src="http://www.flickr.com/badge_code_v2.gne?count=10&amp;display=latest&amp;size=s&amp;layout=x&amp;source=user&amp;user=<?php echo acme_get_flickr_user_id(); ?>"></script>
</div><!-- #flickr -->