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<?php
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/**
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* Feed Writer Class
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*/
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class Feed_Writer_Library {
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/**
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* The feed version - rss20, rss10, rss092, atom
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*
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* @var string
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*/
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private $_format = 'rss20';
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/**
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* The items in feed 'body'
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*
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* @var string
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*/
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private $_items = '';
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/**
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* The complete feed content ('head' + 'body')
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*
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* @var string
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*/
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private $_feed = '';
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/**
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* Constructor
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*/
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public function __construct(array $config = NULL) {
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if (count($config) > 0) {
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$this->_format = $config['format'];
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}
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}
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/**
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* Build complete feed string from feed_data
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*
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* @param array('body' => array(), 'head' => array())
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* @return the complete feed string
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*/
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public function write_feed(array $feed_data = NULL) {
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// Build feed body
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foreach ($feed_data['body'] as $value) {
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$this->_add_item($value);
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}
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// Build feed head then put head and body together
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$this->_assemble_feed($feed_data['head']) ;
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return $this->_feed;
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}
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/**
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* Strip '&', '<', and '>' into XML entities
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*
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* @param string
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* @return string
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*/
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private function _strip($s) {
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$s = str_replace('&', '&', $s);
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$s = str_replace('<', '<', $s);
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$s = str_replace('>', '>', $s);
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if ($s == '') {
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$s = ' ';
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}
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return $s;
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}
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/**
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* Add each feed item or entry to feed 'body'
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*
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* @param array('id', 'title', 'link', 'abstract', 'author', 'detail')
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* @return void
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*/
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private function _add_item($a) {
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switch ($this->_format) {
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case 'rss092':
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$item = "\t" . '<item>' . "\n";
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$item .= "\t\t" . '<title>' . $this->_strip($a['title']) . '</title> ' . "\n";
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$item .= "\t\t" . '<description><![CDATA[' . $a['abstract'] . ']]></description>' . "\n";
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$item .= "\t\t" . '<link>' . $this->_strip($a['link']) . '</link>' . "\n";
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$item .= "\t" . '</item>' . "\n";
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break;
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case 'rss10':
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$item = "\t" . '<item rdf:about="' . $this->_strip($a['link']) . '">' . "\n";
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$item .= "\t\t" . '<title>' . $this->_strip($a['title']) . '</title>' . "\n";
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$item .= "\t\t" . '<dc:title>' . $this->_strip($a['title']) . '</dc:title>' . "\n";
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$item .= "\t\t" . '<description><![CDATA[' . $a['abstract'] . ']]></description>' . "\n";
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$item .= "\t\t" . '<link>' . $this->_strip($a['link']) . '</link>' . "\n";
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$item .= "\t\t" . '<dc:date>' . substr($a['date'], 0, 4) . '-' . substr($a['date'], 4, 2) . '-' . substr($a['date'], 6, 2) . ' ' . substr($a['date'], 8, 2) . ':' . substr($a['date'], 10, 2) . ':' . substr($a['date'], 12, 4) . '</dc:date>' . "\n";
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$item .= "\t\t" . '<dc:creator>' . $this->_strip($a['author']) . '</dc:creator>' . "\n";
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$item .= "\t" . '</item>' . "\n";
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break;
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case 'rss20':
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$item = "\t" . '<item>' . "\n";
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$item .= "\t\t" . '<title>' . $this->_strip($a['title']) . '</title>' . "\n";
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$item .= "\t\t" . '<link>' . $this->_strip($a['link']) . '</link>' . "\n";
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$item .= "\t\t" . '<pubDate>' . date('D, d M Y H:i:s', $a['date']) . ' GMT</pubDate>' . "\n";
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$item .= "\t\t" . '<description><![CDATA[' . $a['abstract'] . ']]></description>' . "\n";
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$item .= "\t\t" . '<author>' . $this->_strip($a['author']) . '</author>' . "\n";
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$item .= "\t" . '</item>' . "\n";
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break;
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case 'atom':
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$item = "\t" . '<entry>' . "\n";
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$item .= "\t\t" . '<id>' . $this->_strip($a['id']) . '</id>' . "\n";
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$item .= "\t\t" . '<title>' . $this->_strip($a['title']) . '</title>' . "\n";
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$item .= "\t\t" . '<link>' . $this->_strip($a['link']) . '</link>' . "\n";
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$item .= "\t\t" . '<updated>' . substr($a['date'], 0, 4) . '-' . substr($a['date'], 4, 2) . '-' . substr($a['date'], 6, 2) . 'T' . substr($a['date'], 8, 2) . ':' . substr($a['date'], 10, 2) . ':' . substr($a['date'], 12, 4) . '</updated>' . "\n";
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$item .= "\t\t" . '<summary><![CDATA[' . $a['abstract'] . ']]></summary>' . "\n";
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$item .= "\t\t" . '<author>' . "\n";
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$item .= "\t\t\t" . '<name>' . $this->_strip($a['author']) . '</name>' . "\n";
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$item .= "\t\t" . '</author>' . "\n";
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$item .= "\t\t" . '<content><![CDATA[' . $a['detail'] . ']]></content>' . "\n";
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$item .= "\t" . '</entry>' . "\n";
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break;
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}
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$this->_items .= $item;
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}
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/**
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* Combine feed 'head' with feed 'body'
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*
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* @param array('title', 'description', 'link', 'date')
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* @return void
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*/
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private function _assemble_feed($fa) {
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$this->_feed = '<?xml version="1.0" encoding="utf-8"?>' . "\n";
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// $fa = func_get_args();
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switch ($this->_format) {
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case 'rss092':
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$this->_feed .= '<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://my.netscape.com/rdf/simple/0.9/">' . "\n";
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$this->_feed .= '<channel>' . "\n";
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$this->_feed .= "\t" . '<title>' . $this->_strip($fa['title']) . '</title>' . "\n";
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$this->_feed .= "\t" . '<description><![CDATA[' . $fa['description'] . ']]></description>' . "\n";
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$this->_feed .= "\t" . '<link>' . $this->_strip($fa['link']) . '</link>' . "\n";
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$this->_feed .= '</channel>' . "\n";
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$this->_feed .= $this->_items;
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$this->_feed .= '</rdf:RDF>';
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break;
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case 'rss10':
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$this->_feed .= '<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/">' . "\n";
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$this->_feed .= '<channel>' . "\n";
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$this->_feed .= "\t" . '<title>' . $this->_strip($fa['title']) . '</title>' . "\n";
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$this->_feed .= "\t" . '<description><![CDATA[' . $fa['description'] . ']]></description>' . "\n";
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$this->_feed .= "\t" . '<link>' . $this->_strip($fa['link']) . '</link>' . "\n";
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$this->_feed .= $this->_items;
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$this->_feed .= '</channel>' . "\n";
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$this->_feed .= '</rdf:RDF>' . "\n";
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break;
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// http://cyber.law.harvard.edu/rss/rss.html#hrelementsOfLtitemgt
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case 'rss20':
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$this->_feed .= '<rss version="2.0">' . "\n";
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$this->_feed .= '<channel>' . "\n";
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$this->_feed .= "\t" . '<title>' . $this->_strip($fa['title']) . '</title>' . "\n";
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$this->_feed .= "\t" . '<description><![CDATA[' . $fa['description'] . ']]></description>' . "\n";
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$this->_feed .= "\t" . '<link>' . $this->_strip($fa['link']) . '</link>' . "\n";
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$this->_feed .= "\t" . '<lastBuildDate>' . date('D, d M Y H:i:s', $fa['date']) . ' GMT</lastBuildDate>' . "\n";
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$this->_feed .= $this->_items;
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$this->_feed .= '</channel>' . "\n";
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$this->_feed .= '</rss>' . "\n";
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break;
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// http://www.atomenabled.org/developers/syndication/
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case 'atom':
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$this->_feed .= '<feed version="0.3" xmlns="http://purl.org/atom/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="zh-cn">' . "\n";
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$this->_feed .= "\t" . '<id>http://example.com/</id>' . "\n";
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$this->_feed .= "\t" . '<title>' . $this->_strip($fa['title']) . '</title>' . "\n";
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$this->_feed .= "\t" . '<link>' . $this->_strip($fa['link']) . '</link>' . "\n";
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$this->_feed .= "\t" . '<updated>' . substr($fa['date'], 0, 4) . '-' . substr($fa['date'], 4, 2) . '-' . substr($fa['date'], 6, 2) . 'T' . substr($fa['date'], 8, 2) . ':' . substr($fa['date'], 10, 2) . ':' . substr($fa['date'], 12, 4) . '</updated>' . "\n";
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$this->_feed .= $this->_items;
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$this->_feed .= '</feed>' . "\n";
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break;
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}
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}
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}
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/* End of file: ./system/libraries/feed_writer/feed_writer_library.php */
Page URI: http://www.infopotato.com/index.php/code/library/feed_writer/