php ajax异步读取rss文档数据，
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 id="output">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>");
}
?>
以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。
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