详解PHP使用DOMDocument类遍历、增加、修改、删除XML节点操作
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 (
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(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
Definition以DTD或XML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段
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 把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");
?>
制作人:飞虎 无兄弟不编程!
=====================================================================================
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