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RSS BOX odczyt kanałów RSS - AJAX i PHP

Skrypt pobiera dane z kanału RSS i wyświetla je co określoną ilość czasu podaną w zmiennej.

Na początku tworzymy katalog o nazwie rsscache w nim będzie przechowywany cache

Listing

//index.html #############################################

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Ajax</title>
<link href="ajaxcss.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="ajaxcore.js"></script>
<script type="text/javascript" src="ajax.js"></script>
</head>
<body onload="startRequest('http://rss.di.com.pl/all.rss');">
<div id="mainDiv" class="mainDiv">
<p style="text-align:center;">To jest główna warstwa danych.</p>
</div>
<div id="rssBox" class="rssBox">
</div>
</body>
</html>

//lastRSS.php-----------------------------------------------------

<?php

class lastRSS {
// -----------------------------------------
// Public properties
// -----------------------------------------------
var $default_cp = 'UTF-8';
var $CDATA = 'nochange';
var $cp = '';
var $items_limit = 0;
var $stripHTML = False;
var $date_format = '';

// ------------------------------------------
// Private variables
// --------------------------------------------
var $channeltags = array ('title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'lastBuildDate', 'rating', 'docs');
var $itemtags = array('title', 'link', 'description', 'author', 'category', 'comments', 'enclosure', 'guid', 'pubDate', 'source');
var $imagetags = array('title', 'url', 'link', 'width', 'height');
var $textinputtags = array('title', 'description', 'name', 'link');

// -----------------------------------------
// Parse RSS file and returns associative array.
// ---------------------------------------------
function Get ($rss_url) {
// If CACHE ENABLED
if ($this->cache_dir != '') {
$cache_file = $this->cache_dir . '/rsscache_' . md5($rss_url);
$timedif = @(time() - filemtime($cache_file));
if ($timedif < $this->cache_time) {
// cached file is fresh enough, return cached array
$result = unserialize(join('', file($cache_file)));
// set 'cached' to 1 only if cached file is correct
if ($result) $result['cached'] = 1;
} else {
// cached file is too old, create new
$result = $this->Parse($rss_url);
$serialized = serialize($result);
if ($f = @fopen($cache_file, 'w')) {
fwrite ($f, $serialized, strlen($serialized));
fclose($f);
}
if ($result) $result['cached'] = 0;
}
}
// If CACHE DISABLED >> load and parse the file directly
else {
$result = $this->Parse($rss_url);
if ($result) $result['cached'] = 0;
}
// return result
return $result;
}

// --------------------------------------------
// Modification of preg_match(); return trimed field with index 1
// from 'classic' preg_match() array output
// -------------------------------------
function my_preg_match ($pattern, $subject) {
// start regullar expression
preg_match($pattern, $subject, $out);

// if there is some result... process it and return it
if(isset($out[1])) {
// Process CDATA (if present)
if ($this->CDATA == 'content') { // Get CDATA content (without CDATA tag)
$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
} elseif ($this->CDATA == 'strip') { // Strip CDATA
$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
}

// If code page is set convert character encoding to required
if ($this->cp != '')
//$out[1] = $this->MyConvertEncoding($this->rsscp, $this->cp, $out[1]);
$out[1] = iconv($this->rsscp, $this->cp.'//TRANSLIT', $out[1]);
// Return result
return trim($out[1]);
} else {
// if there is NO result, return empty string
return '';
}
}

// --------------------------------------------
// Replace HTML entities &something; by real characters
// ---------------------------------------------
function unhtmlentities ($string) {
// Get HTML entities table
$trans_tbl = get_html_translation_table (HTML_ENTITIES, ENT_QUOTES);
// Flip keys<==>values
$trans_tbl = array_flip ($trans_tbl);
// Add support for ' entity (missing in HTML_ENTITIES)
$trans_tbl += array(''' => "'");
// Replace entities by values
return strtr ($string, $trans_tbl);
}

// ---------------------------------------------
// Parse() is private method used by Get() to load and parse RSS file.
// Don't use Parse() in your scripts - use Get($rss_file) instead.
// ---------------------------------------------
function Parse ($rss_url) {
// Open and load RSS file
if ($f = @fopen($rss_url, 'r')) {
$rss_content = '';
while (!feof($f)) {
$rss_content .= fgets($f, 4096);
}
fclose($f);

// Parse document encoding
$result['encoding'] = $this->my_preg_match("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);
// if document codepage is specified, use it
if ($result['encoding'] != '')
{ $this->rsscp = $result['encoding']; } // This is used in my_preg_match()
// otherwise use the default codepage
else
{ $this->rsscp = $this->default_cp; } // This is used in my_preg_match()

// Parse CHANNEL info
preg_match("'<channel.*?>(.*?)</channel>'si", $rss_content, $out_channel);
foreach($this->channeltags as $channeltag)
{
$temp = $this->my_preg_match("'<$channeltag.*?>(.*?)</$channeltag>'si", $out_channel[1]);
if ($temp != '') $result[$channeltag] = $temp; // Set only if not empty
}
// If date_format is specified and lastBuildDate is valid
if ($this->date_format != '' && ($timestamp = strtotime($result['lastBuildDate'])) !==-1) {
// convert lastBuildDate to specified date format
$result['lastBuildDate'] = date($this->date_format, $timestamp);
}

// Parse TEXTINPUT info
preg_match("'<textinput(|[^>]*[^/])>(.*?)</textinput>'si", $rss_content, $out_textinfo);
// This a little strange regexp means:
// Look for tag <textinput> with or without any attributes, but skip truncated version <textinput /> (it's not beggining tag)
if (isset($out_textinfo[2])) {
foreach($this->textinputtags as $textinputtag) {
$temp = $this->my_preg_match("'<$textinputtag.*?>(.*?)</$textinputtag>'si", $out_textinfo[2]);
if ($temp != '') $result['textinput_'.$textinputtag] = $temp; // Set only if not empty
}
}
// Parse IMAGE info
preg_match("'<image.*?>(.*?)</image>'si", $rss_content, $out_imageinfo);
if (isset($out_imageinfo[1])) {
foreach($this->imagetags as $imagetag) {
$temp = $this->my_preg_match("'<$imagetag.*?>(.*?)</$imagetag>'si", $out_imageinfo[1]);
if ($temp != '') $result['image_'.$imagetag] = $temp; // Set only if not empty
}
}
// Parse ITEMS
preg_match_all("'<item(| .*?)>(.*?)</item>'si", $rss_content, $items);
$rss_items = $items[2];
$i = 0;
$result['items'] = array(); // create array even if there are no items
foreach($rss_items as $rss_item) {
// If number of items is lower then limit: Parse one item
if ($i < $this->items_limit || $this->items_limit == 0) {
foreach($this->itemtags as $itemtag) {
$temp = $this->my_preg_match("'<$itemtag.*?>(.*?)</$itemtag>'si", $rss_item);
if ($temp != '') $result['items'][$i][$itemtag] = $temp; // Set only if not empty
}
// Strip HTML tags and other bullshit from DESCRIPTION
if ($this->stripHTML && $result['items'][$i]['description'])
$result['items'][$i]['description'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['description'])));
// Strip HTML tags and other bullshit from TITLE
if ($this->stripHTML && $result['items'][$i]['title'])
$result['items'][$i]['title'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['title'])));
// If date_format is specified and pubDate is valid
if ($this->date_format != '' && ($timestamp = strtotime($result['items'][$i]['pubDate'])) !==-1) {
// convert pubDate to specified date format
$result['items'][$i]['pubDate'] = date($this->date_format, $timestamp);
}
// Item counter
$i++;
}
}

$result['items_count'] = $i;
return $result;
}
else // Error in opening return False
{
return False;
}
}
}

?>

//dane.php #############################################

<?php

require_once('lastRSS.php');

if(isSet($_GET["url"]) && $_GET["url"] != ""){
$url = $_GET["url"];

$rss = new lastRSS;
$rss->cache_dir = './rsscache';
$rss->cache_time = 3600;
$rss->cp = "UTF-8";

$str = "";
if ($rssArr = $rss->get($url)) {
foreach($rssArr['items'] as $row){
$str .= $row['title'] . "\n";
$str .= $row['pubDate'] . "\n";
$str .= $row['link'] . "\n";
$str .= $row['description'] . "\n\n";
}
echo rtrim($str);
}
else {
die ("error");
}
}
else{
echo "error";
}
?>

//ajaxcss.css #############################################

.mainDiv
{
color: #333333;
position: relative;
background-color: #EFEFEF;
border: 1px solid #000000;
margin: 10px 10px 10px 10px;
padding: 14px 14px 14px 14px;
width: 350px;
visibility: visible;
}

.dataDiv
{
color: #333333;
position: relative;
background-color: #ffffff;
border: 1px solid #000000;
margin: 10px 10px 10px 10px;
padding: 14px 14px 14px 14px;
width: 420px;
visibility: visible;
}

.myButton
{
font-family:helvetica,sans-serif;
font-size:84%;
font-weight:bold;
border:1px solid;
border-top-color:#696;
border-left-color:#696;
border-right-color:#363;
border-bottom-color:#363;
width:120px;
margin:5px;
}

.myTextInput
{
border:1px solid;
background-color: #F8F8F8;
border-top-color:#696;
border-left-color:#696;
border-right-color:#363;
border-bottom-color:#363;
width:70%;
}

//ajaxcore.js #############################################

function getXMLHttpRequestObject()
{
try{
return new XMLHttpRequest();
}
catch(e){
try{
return new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e){
return false;
}
}
}

function startGETRequest(url, onComplete, onEnd)
{
var XMLHttpRequestObject = getXMLHttpRequestObject();
if(XMLHttpRequestObject){
XMLHttpRequestObject.open("GET", url);
XMLHttpRequestObject.onreadystatechange = function()
{
if (XMLHttpRequestObject.readyState == 4){
if(XMLHttpRequestObject.status == 200){
var responseXML = XMLHttpRequestObject.responseXML;
var responseText = XMLHttpRequestObject.responseText;
onComplete(responseText, responseXML);
}
delete XMLHttpRequestObject;
onEnd();
}
}
XMLHttpRequestObject.send(null);
}
}

function startPOSTRequest(url, params, onComplete, onEnd)
{
var XMLHttpRequestObject = getXMLHttpRequestObject();
if(XMLHttpRequestObject){
XMLHttpRequestObject.open("POST", url);
XMLHttpRequestObject.setRequestHeader(
'Content-Type', 'application/x-www-form-urlencoded');
XMLHttpRequestObject.onreadystatechange = function()
{
if (XMLHttpRequestObject.readyState == 4){
if(XMLHttpRequestObject.status == 200){
var responseXML = XMLHttpRequestObject.responseXML;
var responseText = XMLHttpRequestObject.responseText;
onComplete(responseText, responseXML);
}
delete XMLHttpRequestObject;
onEnd();
}
}
XMLHttpRequestObject.send(params);
}
}

//ajax.js #############################################

var mainArray = new Array();
var currItem = 0;
var timeout = 5;

function startRequest(param)
{
var rssDiv = document.getElementById("rssBox");
rssDiv.innerHTML = "Trwa wczytywanie danych...";
url = "dane.php?url=" + param;
startGETRequest(url, onComplete, onEnd);
}

function startRSSShow()
{
if(mainArray.length < 1) return;
var item = mainArray[currItem];
if(++currItem >= mainArray.length) currItem = 0;
text = "<p><b>" + item['title'] + "</b></p>";
text += "<p>" + item['pubDate'] + "</p>";
text += "<p>" + item['description'] + "</p>";
text += "<a href=\"" + item['link'] + "\">Więcej...</a>";

var rssDiv = document.getElementById("rssBox");
rssDiv.innerHTML = text;
setTimeout("startRSSShow();", timeout * 1000);
}

function onComplete(text, xml)
{
if(text == 'error'){
var rssDiv = document.getElementById("rssBox");
rssDiv.innerHTML = "Wiadomości RSS nie są dostępne.";
}
else{
items = text.split("\n\n");
for(i = 0; i < items.length; i++){
tempArr = new Array();
elements = items[i].split("\n");
tempArr['title'] = elements[0];
tempArr['pubDate'] = elements[1];
tempArr['link'] = elements[2];
tempArr['description'] = elements[3];
mainArray.push(tempArr);
}
startRSSShow();
}
}

function onEnd()
{
}