php rss分析类程序

class rss74 {

// RSS feed title:
var $title = "Untitled";

// RSS description:
var $desc = "";

// RSS base url
// -> Example: http://www.jon**asjo*hn.de/
var $base_url = "";

// XSL file for the resulting RSS feed:
var $xsl_file = 'rss.xsl';

// RSS 2.0 Specification (URL):
var $doc_url = 'http://blogs.*law.harv*a*rd.edu/tech/rss';

// Copyright text:
// -> Example: Copyright 2006, Jonas John
var $copyright = '';

// RSS language setting:
// Example: en-us, de-de, fr-fr
var $language = 'en-us';

// Managing editor and webmaster:
// (should contain a E-Mail adress)
var $managing_editor = '';
var $webmaster = '';

// Feedburner URL
// Example: http://feeds.*f*eedbu*rner.com/codedump-rss
// (If a FB URL is set, all requests except the Feedburner and Google
// requests will be redricted to the feedburner URL)
var $feedburner_url = '';

// RSS generator:
var $generator = 'rss74/v0.3';

// Limit RSS entries to:
// (Example: 20, 30, 40, 50, etc.)
var $limit_entries = 20;

// RSS items:
var $items = array();

// constructor:
function rss74(){
}

function add_entry($entry){

// create date key:
$date = isset($entry['date']) ? $entry['date'] : time();

// add unique string:
$date .= '_' . md5($entry['title']);

$this->items[$date] = $entry;
}

function _get_val(&$array, $key){
return isset($array[$key]) ? $array[$key] : '';
}

function _exists_val(&$array, $key){
return isset($array[$key]);
}

function get_rss_headers($rss_webpath){
return '';
}

function print_rss(){
global $_SERVER;

krsort($this->items);
$this->items = array_slice($this->items, 0, $this->limit_entries);

$first_item = array_keys($this->items);
$first_item = $first_item[0];

$last_change = $this->items[$first_item]['date'];
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $last_change).' GMT');

header('Content-Type: text/xml; charset=utf-8');

if (!empty($this->feedburner_url)){
if (!preg_match("/feedburner/i", $_SERVER['HTTP_USER_AGENT']) and !preg_match("/google/i", $_SERVER['HTTP_USER_AGENT'])) {
header('HTTP/1.1 301 Moved Permanently');
header('Location: ' . $this->feedburner_url);
print '';
return true;
}
}

print '' . " ";

if ($this->xsl_file != '')
print '' . " ";

print ']>' . " ";

print "";

print '' . " ";
print '' . " ";

print " ".'' . " ";

if (!empty($this->desc))
print " ".''.htmlentities($this->desc).'' . " ";

if (!empty($this->base_url))
print " ".''.htmlentities($this->base_url).'' . " ";

print " ".''.date('r', time()).'' . " ";
print " ".''.date('r', time()).'' . " ";

if (!empty($this->generator))
print " ".''.$this->generator.'' . " ";

if (!empty($this->copyright))
print " ".''.$this->copyright.'' . " ";

if (!empty($this->doc_url))
print " ".''.$this->doc_url.'' . " ";

if (!empty($this->language))
print " ".$this->language." ";

if (!empty($this->managing_editor))
print " ".$this->managing_editor." ";

if (!empty($this->webmaster))
print " ".$this->webmaster." ";

while(list($num, $item) = each($this->items)){

print " ";
print " ";

if ($this->_exists_val($item, 'url')){
print " ".$this->_get_val($item, 'url')." ";
print " ".$this->_get_val($item, 'url')." ";
}

if ($this->_exists_val($item, 'desc'))
print " _get_val($item, 'desc')."]]> ";

if ($this->_exists_val($item, 'date')){
print " ".date('r', intval($this->_get_val($item, 'date')))." ";
}

$cats = array();
while(list($cn, $citem) = each($cats)){
print " $citem ";
}

print " ";

}

print " ";
print "";

return true;

}
}

实例

include('inc.rss74.php');

// RSS items list:
$example_list = array();

/*
** Create some test entries:
*/

$m = rand(8, 30);
for ($x = 0; $x
// create a random UNIX-Timestamp:
$date = rand(1166000000, 1166400000);

$example_list[] = array(
'title' => 'Example RSS message #' . $x,
'url' => 'http://www.jon**asjo*hn.de/#' . $x,
'desc' => 'This is a example message from RSS74!',
'date' => $date
);

}


// create new RSS object:
$rss = new rss74();

/*
** Set RSS informations:
*/

// RSS title:
$rss->title = 'RSS example 2';

// RSS description:
$rss->desc = 'This feed shows some random entries.';

// base URL of your homepage:
$rss->base_url = 'http://www.*e*xam*ple.org/';

// limit entry count to 20
$rss->limit_entries = 20;

// RSS Editor
$rss->managing_editor = 'Yourname ';

// Webmaster name
$rss->webmaster = 'Yourname ';

// language:
$rss->language = 'en-us';

// Copyright message:
$rss->copyright = 'Copyright 2006, Yourname';

// Set Feedburner adress:
//$rss->feedburner_url = 'http://feeds.*f*eedbu*rner.com/codedump-rss';
// (empty) = No redirection

// Set "xsl_file" to empty to disable the XSL file:
$rss->xsl_file = '';

// Add entries to the RSS object:
while (list($date, $entry) = each($example_list)){

$rss->add_entry(array(
'title' => $entry['title'],
'url' => $entry['url'],
'desc' => $entry['desc'],
'date' => $entry['date']
));

}

// let rss74 do the rest:
$rss->print_rss();

?>