通过PHP操作XML入门
PHP PEAR就提供一个RSS解析类,方便从用户提供的RSS中,获得相应的信息。
需求
下载XML_RSS: http://pear.php.net/package/XML_RSS
XML_Parser http://pear.php.net/package/XML_Parser
PEAR http://pear.php.net/package/PEAR
具体路径之间的关系,稍微调试一下即可,我是把压缩包解压后,把里面的RSS.php,Parser.php,PEAR.php都放在同一目录下,然后把RSS.php里面的
require_once XML/Parser.php;
改成
require_once XML/Parser.php;
就可以使用了。
RSS版本
经简单的测试,我发现它对RSS上述的三个主要版本,都工作的很好,没有出现问题。说明它是至少支持RSS主要版本的(0.91,1.0,2.0)
例子
用XML_RSS来分析RSS是特别简单的。先包含进类文件:
require "RSS.php";
根据资源地址创建类实例:
$url = "test.rss";
$r =& new XML_RSS($url);
当然这里的$url也可以是一个远程路径,这需要把php.ini里的allow_url_fopen设为On,因为它默认设置即为此,所以一般不用改。
执行分析:
$r->parse();
下面就可以得到各种信息了:
$r->getStructure() 返回是一个数组,包含了RSS文件的所有结构信息。
$r->getChannelInfo() 返回是一个数组,包含了RSS当前频道的概要信息,比如title,link,description等。
$r->getItems() 返回一个二维数组,包含了RSS文件里的所有item信息,每组信息里都有title,link,description,date等等。
$r->getImages() 返回一个二维数组,包含了RSS文件里的所有image信息,每组信息里都有title,link,url等。
$r->getTextinputs() 返回一个二组数组,包含了RSS文件里的所有文件输入区域信息,每组信息里都有title,link,description,name等。
如何根据一个地址打印内容列表
$url = "http://www.BkJia.com/data/rss/37.xml";
$r =& new XML_RSS($url);
$r->parse();
$items = $r->getItems()
foreach ($items as $k=>$item)
{
//$item里面包含了 link:内容链接;title:内容标题;description:内容描述;pubdate:内容表布日期,视站点而定,不一定提供
?>
" target="_blank">
}
?>

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