Php 简明教程

PHP - AJAX RSS Feed Example

Really Simple Syndication (RSS)

RSS（Really Simple Syndication 的缩写）可用于发布网站的经常更新信息，如音频、视频、图像等。我们可以使用 AJAX 和 PHP 将 RSS 提要集成到网站中。此代码演示了如何在我们的站点中显示 RSS 提要。

RSS, which stands for Really Simple Syndication, is used to publish often updated information from website like audio, video, images, etc. We can integrate RSS feeds to a website by using AJAX and PHP. This code demonstrates how to show RSS feeds in our site.

Index.html

索引页应如下所述 −

The 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

“rss.php”中包含有关如何访问 RSS Feeds RSS 提要并将 RSS 提要返回到网页的语法。

"rss.php" has contained syntax about how to get access to RSS Feeds RSS Feeds and return RSS Feeds to the webpages.

<?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>");
   }
?>

它将生成如下输出：

It will produce the following output −

php rss feed example