PHP Ajax RSS提要示例

RSS

非常简单的信息聚合用于发布经常更新的网站信息，如音频、视频、图片等。我们可以通过使用Ajax和PHP将RSS提要集成到网站中。该代码演示了如何在我们的网站上显示RSS提要。

Index.html

首页应该如下所示 –

<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

rss.php包含了关于如何访问RSS源并将其返回给网页的语法。

<?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>");
   }
?>