Home php教程 php手册 详解PHP使用DOMDocument类遍历、增加、修改、删除XML节点操作

详解PHP使用DOMDocument类遍历、增加、修改、删除XML节点操作

Jun 06, 2016 pm 07:47 PM
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Dom ( Document object model )文档 - 对象 - 模型,核心思想是把一个 Xml 文件看成一个对象模型,然后通过对象的方式来操作 Xml 文件。我们先总结出 DOM 对象的属性方法,在分别用案例说明其应用! DOMDocument 属性: Attributes 存储节点的属性列表 (

DomDocument object model)文档-对象-模型,核心思想是把一个Xml文件看成一个对象模型,然后通过对象的方式来操作Xml文件。我们先总结出DOM对象的属性方法,在分别用案例说明其应用!

DOMDocument 属性:

Attributes存储节点的属性列表(只读)

childNodes存储节点的子节点列表(只读)

dataType返回此节点的数据类型

DefinitionDTDXML模式给出的节点的定义(只读)

Doctype 指定文档类型节点(只读)

documentElement返回文档的根元素(可读写)

firstChild返回当前节点的第一个子节点(只读)

Implementation返回XMLDOMImplementation对象

lastChild返回当前节点最后一个子节点(只读)

nextSibling返回当前节点的下一个兄弟节点(只读)

nodeName返回节点的名字(只读)

nodeType返回节点的类型(只读)

nodeTypedValue存储节点值(可读写)

nodeValue返回节点的文本(可读写)

ownerDocument返回包含此节点的根文档(只读)

parentNode返回父节点(只读)

Parsed 返回此节点及其子节点是否已经被解析(只读)

Prefix 返回名称空间前缀(只读)

preserveWhiteSpace指定是否保留空白(可读写)

previousSibling返回此节点的前一个兄弟节点(只读)

Text 返回此节点及其后代的文本内容(可读写)

url 返回最近载入的XML文档的URL(只读)

Xml 返回节点及其后代的XML表示(只读)

 

DOMDocument 方法:

appendChild为当前节点添加一个新的子节点,放在最后的子节点后

cloneNode返回当前节点的拷贝

createAttribute创建新的属性

createCDATAdiv创建包括给定数据的CDATA

createComment创建一个注释节点

createDocumentFragment创建DocumentFragment对象

createElement_x创建一个元素节点

createEntityReference创建EntityReference对象

createNode创建给定类型,名字和命名空间的节点

createPorcessingInstruction创建操作指令节点

createTextNode创建包括给定数据的文本节点

getElementsByTagName返回指定名字的元素集合

hasChildNodes返回当前节点是否有子节点

insertBefore在指定节点前插入子节点

Load 导入指定位置的XML文档

loadXML 导入指定字符串的XML文档

removeChild从子结点列表中删除指定的子节点

replaceChild从子节点列表中替换指定的子节点

Save XML文件存到指定节点

selectNodes对节点进行指定的匹配,并返回匹配节点列表

selectSingleNode对节点进行指定的匹配,并返回第一个匹配节点

transformNode使用指定的样式表对节点及其后代进行转换

 

1、创建一个Xml文件

    //实例化一个DomDocument对象

    $dom = new DomDocument('1.0', 'UTF-8');

    //如果文件不存在就创建一个

    if(!file_exists("xml_test.xml")){

           header("Content-Type:text/plain");

           $root= $dom->createElement("class");

           $dom->appendChild($root);

           $dom->save("xml_test.xml");

    } else{

           $dom->load("xml_test.xml"); 

    }

    print$dom->saveXML();

?>

 

2、增加元素

    //addElementsxml.php

    $dom = new DOMDocument("1.0","UTF-8");

   

    $dom->load("xml_test.xml");

   

    $root_class =$dom->getElementsByTagName("class");

    $i = 0;

   // for($i = 0;$i

           $root_class_node =$root_class->item($i);

           $stu_node=$dom->createElement("student");

           $stu_node->setAttribute("xingbie","man");

           $stu_node_name=$dom->createElement("name","name".$i);

           //设置属性

           $stu_node_name->setAttribute("hel","23");

           $stu_node_age=$dom->createElement("age","21");

           $stu_node_introduce=$dom->createElement("introduce","1111");

           $stu_node->appendChild($stu_node_name);

           $stu_node->appendChild($stu_node_age);

           $stu_node->appendChild($stu_node_introduce);

           $root_class_node->appendChild($stu_node);

   // }

    $dom->save("xml_test.xml");

    print $dom->saveXML();

?>

 

3、遍历元素

    //getNode.php

    //解析一个文件的步骤

    //1创建一个对象,表示文档

    $dom = new DOMDocument("1.0","UTF-8");

    //2制定加载那个Xml,解析那个文件

    $dom->load("xml_test.xml");

    //3 获取你关新节点

    $stu_nodes =$dom->getElementsByTagName("student");

   

    for ($i=0;$ilength;$i++){

           //取出每个学生

           $stu_node= $stu_nodes->item($i);

           for($i=0;$ichildNodes->length;$i++){

               echo$stu_node->childNodes->item($i)->nodeValue;

               echo "
";

           }

    }

?>

 

4、删除元素

    //解析一个文件的步骤

    //1创建一个对象,表示文档

    $dom = new DOMDocument("1.0","UTF-8");

    //2制定加载那个Xml,解析那个文件

    $dom->load("xml_test.xml");

    //3 获取你关新节点

    $stu_nodes =$dom->getElementsByTagName("student");

   $stu_node=$stu_nodes->item($stu_nodes->length -1);

    $stu_node->parentNode->removeChild($stu_node);

   

    $dom->save("xml_test.xml");

 ?>

5、修改元素属性

    //1创建一个对象,表示文档

    $dom = new DOMDocument("1.0","UTF-8");

    //2制定加载那个Xml,解析那个文件

    $dom->load("xml_test.xml");

   

    //找到这个学生

    $stus=$dom->getElementsByTagName("age")->item(0);

    $stus->nodeValue=100;

   

    $dom->save("xml_test.xml");

    ?>

 

 

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