1.PHP DOM (1)
Php中的DOM跟javascript不一樣，屬性不用另外增加一個節點
2.主要類
DOMDocument ：文檔類別
DOMNodeList ：節點列表類別
DOMNode ：節點類別
DOMElement ：元素類別
3. DOMDocument類別
3.1建立文件物件
DOMDocument::__construct ([ string $version [, string $encoding ]] )
[ string $version ：版本號
[, string $encoding ]]：字元集
3.2、載入xml檔
mixed DOMDocument::load ( string $filename)
string $filename：要載入的xml檔名
3.3、取得節點
DOMNodeList DOMDocument::getElementsByTagName ( string name )
String name：要取得的節點名稱
範例：Demo.php
<?<span>php
header ( </span><span>'</span><span>Content-Type:text/html;charset=gb2312</span><span>'</span><span> );
</span><span>//</span><span> 利用php解析demo01.xml
</span><span>//</span><span> 实例化dom对象</span>
$dom = <span>new</span><span> DOMDocument ();
</span><span>//</span><span> 加载xml文件</span>
$dom->load ( <span>'</span><span>demo01.xml</span><span>'</span><span> );
</span><span>//</span><span> 通过dom对象获取person节点，注意：这里返回值是一个DOMNodeList类对象</span>
$persons = $dom->getElementsByTagName ( <span>'</span><span>person</span><span>'</span><span> );
</span><span>//</span><span> 共有几个person</span>
echo <span>'</span><span>共有</span><span>'</span> . $persons->length . <span>'</span><span>个人<br></span><span>'</span>; <span>//</span><span>输出共有两个人
</span><span>//</span><span> 选中索引为0的person，也就是第一个人</span>
$person = $persons->item ( <span>0</span><span> );
</span><span>//</span><span> 在这个person下获取name节点，返回的仍然是一个DOMNodeList类对象</span>
$names = $person->getElementsByTagName ( <span>'</span><span>name</span><span>'</span><span> );
</span><span>//</span><span> 输出姓名</span>
echo $names->item ( <span>0</span> )->nodeValue . <span>'</span><span><br></span><span>'</span>; <span>//</span><span>输出'张三'</span>
为什么要进行两次取的Nodelist呢？请参照上图，因为有两个节点demo.xml
<?xml version=<span>"</span><span>1.0</span><span>"</span> encoding=<span>"</span><span>UTF-8</span><span>"</span>?>
<persons>
<person id=<span>"</span><span>s101</span><span>"</span>>
<name>zhangsan</name>
<age><span>30</span></age>
</person>
<person>
<name>wangwu</name>
<age><span>18</span></age>
</person>
</persons>4. DOMNodeList類別 （上面的person是NodeList節點）
1、Length
在目前節點清單中共有幾個節點
2、DOMElement DOMNodelist::item ( int $index )
選取索引為index的節點
int $index：索引
5、 DOMNode類
1、nodeValue 節點的值
6、 關於屬性的讀取
1、bool DOMElement::hasAttribute ( string $name )
判斷是否具有某一屬性（只判斷某屬性下有沒有）
String $name：屬性名稱
2、bool DOMNode::hasAttributes ( void )
判斷是否有屬性（只要有屬性就回傳true）
3、string DOMElement::getAttribute ( string $name )
取得指定屬性的屬性值
String $name：屬性名稱
範例2.用連貫運算輸出
<?<span>php
$dom </span>= <span>new</span> DOMDocument ( <span>'</span><span>1.0</span><span>'</span>, <span>'</span><span>utf-8</span><span>'</span><span> );
$dom</span>->load ( <span>'</span><span>demo01.xml</span><span>'</span><span> );
</span><span>//</span><span> 想得到第一个人的姓名</span>
echo $dom->getElementsByTagName ( <span>'</span><span>person</span><span>'</span> )->item ( <span>0</span><span> )
</span>->getElementsByTagName ( <span>'</span><span>name</span><span>'</span> )->item ( <span>0</span> )-><span>nodeValue;
输出：张三</span>Example3：
<?<span>php
header ( </span><span>'</span><span>Content-Type:text/html;charset=gb2312</span><span>'</span><span> );
$dom </span>= <span>new</span> DOMDocument ( <span>'</span><span>1.0</span><span>'</span>, <span>'</span><span>utf-8</span><span>'</span><span> );
$dom</span>->load ( <span>'</span><span>demo01.xml</span><span>'</span><span> );
$person </span>= $dom->getElementsByTagName ( <span>'</span><span>person</span><span>'</span> )->item ( <span>0</span><span> );
</span><span>//</span><span> 判断节点是否具有id属性</span>
<span>if</span> ($person->hasAttribute ( <span>'</span><span>id</span><span>'</span><span> )) {
echo </span><span>'</span><span>具有id属性</span><span>'</span><span>;
} </span><span>else</span><span> {
echo </span><span>'</span><span>没有id属性</span><span>'</span><span>;
}
echo </span><span>'</span><span><br></span><span>'</span><span>;
</span><span>//</span><span> 判断节点是否具有属性</span>
<span>if</span> ($person-><span>hasAttributes ()) {
echo </span><span>'</span><span>有属性</span><span>'</span><span>;
} </span><span>else</span><span> {
echo </span><span>'</span><span>没有任何属性</span><span>'</span><span>;
}
echo </span><span>'</span><span><br></span><span>'</span><span>;
</span><span>//</span><span> 得到第一个person的id属性值</span>
echo $person->getAttribute ( <span>'</span><span>id</span><span>'</span> );之前的例子只能得到一條數據，現在我想得到所有人的完整訊息，該如何實現？
範例4：
如果
<?<span>php
header ( </span><span>'</span><span>content-type:text/html;charset=gb2312</span><span>'</span><span> );
$dom </span>= <span>new</span> DOMDocument ( <span>'</span><span>1.0</span><span>'</span>, <span>'</span><span>utf-8</span><span>'</span><span> );
$dom</span>->load ( <span>'</span><span>demo01.xml</span><span>'</span><span> );
</span><span>//</span><span> 得到所有person节点</span>
$persons = $dom->getElementsByTagName ( <span>'</span><span>person</span><span>'</span><span> );
</span><span>//</span><span> 得到总人数</span>
$count = $persons-><span>length;
</span><span>for</span>($i = <span>0</span>; $i < $count; $i ++<span>) {
</span><span>//</span><span> $person表示第i个人</span>
$person = $persons-><span>item ( $i );
echo </span><span>'</span><span>第</span><span>'</span> . ($i + <span>1</span>) . <span>'</span><span>个人的</span><span>'</span><span>;
</span><span>if</span> ($person->hasAttribute ( <span>'</span><span>id</span><span>'</span><span> )) {
echo </span><span>'</span><span>学号：</span><span>'</span> . $person->getAttribute ( <span>'</span><span>id</span><span>'</span><span> );
}
echo </span><span>'</span><span>姓名：</span><span>'</span> . $person->getElementsByTagName ( <span>'</span><span>name</span><span>'</span> )->item ( <span>0</span> )-><span>nodeValue;
echo </span><span>'</span><span>年龄：</span><span>'</span> . $person->getElementsByTagName ( <span>'</span><span>age</span><span>'</span> )->item ( <span>0</span> )-><span>nodeValue;
echo </span><span>'</span><span><br></span><span>'</span><span>;
}
</span>?>以上就介紹了php中的XML DOM（10），包含了面向的內容，希望對PHP教學有興趣的朋友有幫助。
