RSS(Really Simple Syndication)是一种描述和同步网站内容的格式，是使用最广泛的XML应用。RSS搭建了信息迅速传播的一个技术平台，使得每个人都成为潜在的信息提供者。
本文实例为大家分享了php ajax异步读取rss文档数据的相关代码，供大家参考，具体内容如下
代码如下：
index.html
<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>RSS-feeds</div> </body> </html>
rss.php
<?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>"); } ?>