1.PHP DOM (1)
Php中的DOM跟javascript不一样,属性不用另外增加一个节点
2.主要类
DOMDocument :文档类
DOMNodeList :节点列表类
DOMNode :节点类
DOMElement :元素类
3. DOMDocument类
3.1创建文档对象
DOMDocument::__construct ([ string $version [, string $encoding ]] )
[ string $version :版本号
[, string $encoding ]]:字符集
3.2、加载xml文件
mixed DOMDocument::load ( string $filename)
string $filename:要加载的xml文件名称
3.3、获取节点
DOMNodeList DOMDocument::getElementsByTagName ( string name )
String name:要获取的节点名
示例:Demo.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | <span>php
header ( </span><span> '</span><span>Content-Type:text/html;charset=gb2312</span><span>' </span><span> );
</span><span>
</span><span>
$dom = <span> new </span><span> DOMDocument ();
</span><span>
$dom ->load ( <span> '</span><span>demo01.xml</span><span>' </span><span> );
</span><span>
$persons = $dom ->getElementsByTagName ( <span> '</span><span>person</span><span>' </span><span> );
</span><span>
echo <span> '</span><span>共有</span><span>' </span> . $persons ->length . <span> '</span><span>个人<br></span><span>' </span>; <span>
</span><span>
$person = $persons ->item ( <span>0</span><span> );
</span><span>
$names = $person ->getElementsByTagName ( <span> '</span><span>name</span><span>' </span><span> );
</span><span>
echo $names ->item ( <span>0</span> )->nodeValue . <span> '</span><span><br></span><span>' </span>; <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
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demo.xml
1 2 3 4 5 6 7 8 9 10 11 | <?xml version=<span> "<span>1.0</span><span>" </span> encoding=<span> "</span><span>UTF-8</span><span>" </span>?>
<persons>
<person id= "<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>
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4. DOMNodeList类 (上面的person就是NodeList节点)
1、Length
当前节点列表中共有几个节点
2、DOMElement DOMNodelist::item ( int $index )
选中索引为index的节点
int $index:索引
5、 DOMNode类
1、nodeValue 节点的值
6、 关于属性的读取
1、bool DOMElement::hasAttribute ( string $name )
判断是否具有某个属性(只判断某个属性下有没有)
String $name:属性名
2、bool DOMNode::hasAttributes ( void )
判断是否具有属性(只要有属性就返回true)
3、string DOMElement::getAttribute ( string $name )
获取指定属性的属性值
String $name:属性名
示例2.用连贯操作输出
1 2 3 4 5 6 7 | <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>
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>
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Example3:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | <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> 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> 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>
echo $person ->getAttribute ( <span> '</span><span>id</span><span>' </span> );
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之前的例子只能得到一条数据,现在我想得到所有人的完整信息,该如何实现?
示例4:
如果这种有属性的,也要遍历出来呢?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | <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>
$persons = $dom ->getElementsByTagName ( <span> '</span><span>person</span><span>' </span><span> );
</span><span>
$count = $persons -><span>length;
</span><span> for </span>( $i = <span>0</span>; $i ) {
<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>?>
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以上就介绍了php中的XML DOM(10),包括了方面的内容,希望对PHP教程有兴趣的朋友有所帮助。