PHP - AJAX RSS Feed Tutorial

PHP AJAX RSS Feed


Hello folks! welcome back to a new edition of our tutorial on PHP. In this edition of our PHP tutorial, we will be studying about the AJAX RSS Feed in PHP.

What is an RSS?

RSS (Really Simple Syndication) is used in publishing often updated information from a website like audio, video, image, etc. We can integrate the RSS feeds into a website using Ajax and PHP. This code illustrates how to show RSS feeds in our website.

Index.html

Index page should be as follows -

<html>
   <head>
      
      <script>
         function showRSS(str) {
            if (str.length == 0) { 
               document.getElementById("output").innerHTML = "";
               return;
            }
         
            if (window.XMLHttpRequest) {
               xmlhttp = new XMLHttpRequest();
            }else {
               xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            xmlhttp.onreadystatechange = function() {
               if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                  document.getElementById("output").innerHTML = xmlhttp.responseText;
               }
            }
            
            xmlhttp.open("GET","rss.php?q="+str,true);
            xmlhttp.send();
         }
      </script>
      
   </head>
   
   <body>
      <p>Please Select an option to get RSS:</p>
      
      <form>
         <select onchange = "showRSS(this.value)">
            <option value = "">Select an RSS-feed:</option>
            <option value = "cnn">CNN</option>
            <option value = "bbc">BBC News</option>
            <option value = "pc">PC World</option>
         </select>
      </form>
      <br>
      
      <div id = "output">RSS-feeds</div>
      
   </body>
</html>


rss.php

The rss.php contains the syntax about how to get access to RSS feeds and return RSS feeds back to the web pages.

<?php
   $q = $_GET["q"];
   
   if($q == "cnn") {
      $xml = ("http://rss.cnn.com/rss/cnn_topstories.rss");
   }elseif($q == "bbc") {
      $xml = ("http://newsrss.bbc.co.uk/rss/newsonline_world_edition/americas/rss.xml");
   }elseif($q = "pcw"){
      $xml = ("http://www.pcworld.com/index.rss");
   }
	
   $xmlDoc = new DOMDocument();
   $xmlDoc->load($xml);
   
   $channel = $xmlDoc->getElementsByTagName('channel')->item(0);
   
   $channel_title = $channel->getElementsByTagName('title')
   ->item(0)->childNodes->item(0)->nodeValue;
   
   $channel_link = $channel->getElementsByTagName('link')
   ->item(0)->childNodes->item(0)->nodeValue;
   
   $channel_desc = $channel->getElementsByTagName('description')
   ->item(0)->childNodes->item(0)->nodeValue;
   
   echo("<p><a href = '" . $channel_link . "'>" . 
      $channel_title . "</a>");
   echo("<br>");
   echo($channel_desc . "</p>");
   
   $x = $xmlDoc->getElementsByTagName('item');
   
   for ($i = 0; $i<=2; $i++) {
      $item_title = $x->item($i)->getElementsByTagName('title')
      ->item(0)->childNodes->item(0)->nodeValue;
      
      $item_link = $x->item($i)->getElementsByTagName('link')
      ->item(0)->childNodes->item(0)->nodeValue;
      
      $item_desc = $x->item($i)->getElementsByTagName('description')
      ->item(0)->childNodes->item(0)->nodeValue;
      
      echo ("<p><a href = '" . $item_link . "'>" .
         $item_title . "</a>");
      echo ("<br>");
      echo ($item_desc . "</p>");
   }
?>

Output

When the above code is executed, it will produce the following result -



Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about PHP - XML Introduction.

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