解析xml文件以及解析xml字符串

不久前做了个功能需要读取xml文件，虽然以前也做过很多次了，但一直没有想过总结一下，今天正好空闲，于是小小总结一番，以方便以后用起来更加顺手，下面开始正文。

假设目前有如下xml源文件，该文件保存名为books.xml：

<?xml version="1.0" encoding="UTF-8"?>
<books>
    <book>
        <author>phpernote.com</author>
        <title>PHP And MySQL Development</title>
        <publisher>火星出版社</publisher>
    </book>
    <book>
        <author>taobao.com</author>
        <title>如何淘宝</title>
        <publisher>淘宝出版社</publisher>
    </book>
</books>

　　（1）利用simplexml读取xml文件，示例如下：

<?php
header('Content-type:text/html;charset=utf-8');
$books=simplexml_load_file('books.xml');//将XML中的数据,读取到数组对象中
foreach($books as $v){
	echo $v->author."-".$v->title."-".$v->publisher."<br>";
}

　　如需更详细的了解 PHP SimpleXML 函数，请参考：PHP SimpleXML 函数

（2）利用DOMDocument读取xml文件，示例如下：

<?php
header('Content-type:text/html;charset=utf-8');
$doc=new DOMDocument();
$doc->load('books.xml');//读取xml文件
$book=$doc->getElementsByTagName('book');//取得book标签的对象数组
echo $book->length,'<br />';
foreach($book as $v){
	$author=$v->getElementsByTagName('author');//取得author的标签的对象数组
	$author=$author->item(0)->nodeValue;//取得node中的值
	$title=$v->getElementsByTagName('title');
	$title=$title->item(0)->nodeValue;
	$publisher=$v->getElementsByTagName('publisher');
	$publisher=$publisher->item(0)->nodeValue;
	echo "$author - $title - $publisher <br />";
}

　　

如需更详细的了解 DOMDocument 的有关方法，请参考php官方文档：The DOMDocument class

当然还有很多其他的办法，比如用正则表达式解析等等，这些以后用到的时候再继续追加总结，今天就写了这么两种办法吧，对于一般的已经足够了。

 

解析xml字符串     

如果是xml文件，则用

$xml->load("timeline.xml");

如果是解析xml字符串则用

$xml->loadXML($xmlstring);

------------------------------------------------------

获得节点属性：getAttribute('id');
获得节点值：nodeValue;

 

$xml = new DOMDocument();
         
        //$xml->load("timeline.xml"); 
        $xmlstring = '<data><time value="2011-08-01"/>
<time value="2011-08-02"/>
<time value="2011-08-03">
             <worker name="test1" id="14">
                 <hour pid="6" pmid="3">spot411</hour>
                 <hour pid="6" pmid="3">spot411</hour>
            </worker>
</time>
<time value="2011-08-04">
           <worker name="test2" id="6">
                <hour pid="9" pmid="4">Pmlal</hour>
                <hour pid="9" pmid="4">Pmlal</hour>
                <hour pid="9" pmid="4">Pmlal</hour>
                <hour pid="9" pmid="4">Pmlal</hour>
               <hour pid="9" pmid="4">Pmlal</hour>
               <hour pid="9" pmid="4">Pmlal</hour>
         </worker>
</time>
<time value="2011-08-05">
             <worker name="test3" id="1">
                  <hour pid="1" pmid="1">Teasavant</hour>
                 <hour pid="1" pmid="1">Teasavant</hour>
                 <hour pid="1" pmid="1">Teasavant</hour>
            </worker>
            <worker name="test4" id="2">
                <hour pid="1" pmid="1">Teasavant</hour>
                <hour pid="1" pmid="1">Teasavant</hour>
                <hour pid="1" pmid="1">Teasavant</hour>
                <hour pid="1" pmid="1">Teasavant</hour>
                <hour pid="1" pmid="1">Teasavant</hour>
          </worker>
　　　　　　<worker name="test5" id="4">
               <hour pid="3" pmid="3">Red8interactive</hour>
               <hour pid="3" pmid="3">Red8interactive</hour>
               <hour pid="3" pmid="3">Red8interactive</hour>
               <hour pid="3" pmid="3">Red8interactive</hour>
              <hour pid="3" pmid="3">Red8interactive</hour>
              <hour pid="3" pmid="3">Red8interactive</hour>
             <hour pid="3" pmid="3">Red8interactive</hour>
             <hour pid="3" pmid="3">Red8interactive</hour>
          </worker>
</time>
<time value="2011-08-06"/><time value="2011-08-07"/></data>'; 
        $xml->loadXML($xmlstring); 
         
        $timedom = $xml->getElementsByTagName("time"); 
        $d_array = array(); 
        foreach ($timedom as $times){ 
            $time_att_value = $times->getAttribute("value"); 
            echo $time_att_value."<br>"; 
            $d_worker = $times->getElementsByTagName("worker"); 
            foreach ($d_worker as $d_work){ 
                $worker_att_id = $d_work->getAttribute("id"); 
                $worker_att_name = $d_work->getAttribute("name"); 
                echo $worker_att_name."<br>"; 
                //echo $worker_att_id."<br>"; 
                $d_hours = $d_work->getElementsByTagName("hour"); 
                foreach ($d_hours as $d_hour){ 
                    $hour_att_pid = $d_hour->getAttribute("pid"); 
                    $hour_att_pmid = $d_hour->getAttribute("pmid"); 
                    
                    echo count($d_hour); 
                    echo $d_hour->nodeValue."<br>"; 
                } 
            } 
        }