Google Picasa Web Albums read only API PHP Parser

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// Google Picasa Web Albums read only API PHP Parser
// © 2010 inst (http://www.inst.tk/)

function picasa_list_pictures( $user, $album, $thumb_max_size = 200 )
{
	$feed_url = "http://picasaweb.google.com/data/feed/base/user/$user/album/$album";
	$xml = new DOMDocument();
	$xml->load( $feed_url );
	$namespace_media = $xml->getElementsByTagName( 'feed' )->item( 0 )->getAttribute( 'xmlns:media' );

	$pictures = array();
	foreach( $xml->getElementsByTagName( 'entry' ) as $entry )
	{
		$elem = $entry->getElementsByTagNameNS( $namespace_media, 'group' )->item( 0 );
		$thumb = array( 'url' => '', 'size' => 0 );
		foreach( $elem->getElementsByTagNameNS( $namespace_media, 'thumbnail' ) as $xml_thumb )
		{
			$thumb_size = (int)$xml_thumb->getAttribute( 'height' );
			$thumb_width = (int)$xml_thumb->getAttribute( 'width' );
			if ( $thumb_width < $thumb_size ) $thumb_size = $thumb_width;
			if( $thumb_size < $thumb_max_size && $thumb_size > $thumb['size'] )
			{
				$thumb['url'] = $xml_thumb->getAttribute( 'url' );
				$thumb['size'] = $thumb_size;
			}
		}
		$content_tag = $elem->getElementsByTagNameNS( $namespace_media, 'content' )->item( 0 );
		$picture = array(
			'title' => $elem->getElementsByTagNameNS( $namespace_media, 'title' )->item( 0 )->nodeValue,
			'thumbnail' => $thumb['url'],
			'url' => $content_tag->getAttribute( 'url' ),
			'width' => $content_tag->getAttribute( 'width' ),
			'height' => $content_tag->getAttribute( 'height' ),
			'mimetype' => $content_tag->getAttribute( 'type' )
		);
		$keywords = $elem->getElementsByTagNameNS( $namespace_media, 'keywords' )->item( 0 )->nodeValue;
		if ( isset( $keywords{0} ) )
			foreach( explode( ',', $keywords ) as $keyword )
				$picture['keywords'][]= trim( $keyword );
		$pictures []= $picture;
	}

	return $pictures;
}