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DOM基础及php读取xml内容操作的方法

Jun 06, 2016 pm 08:13 PM
dom php xml content Base operate method read

这篇文章主要介绍了DOM基础及php读取xml内容操作的方法,实例分析了php对XML文件的增删改查操作原理与技巧,需要的朋友可以参考下

本文实例讲述了DOM基础及php读取xml内容操作的方法。分享给大家供大家参考。具体分析如下:

DOM(Document Object Model):文档对象模型。核心思想是:把 xml文件看作是一个对象模型,然后通过对象的方式来操作 xml 文件。

php对xml文档进行增删改查(curd)操作,具体分析如下:

xml文档:class.xml

复制代码 代码如下:



 
  小乔
 
  20
 

 
  周瑜
 
  25
 


class.xml 对应的 DOM 树结构图

DOM基础及php读取xml内容操作的方法

php文件(对xml文档操作)

查询操作案例:

复制代码 代码如下:

//1、创建一个DOMDocument对象。该对象就表示 xml文件
$xmldoc = new DOMDocument();
//2、加载xml文件(指定要解析哪个xml文件,此时dom树节点就会加载到内存中)
$xmldoc->load("class.xml");
//3、目标:获取第一个学生的名字
//3.1 第一步,,读取所有的学生
$students = $xmldoc->getElementsByTagName("student");//方法getElementsByTagName:根据所给的节点名字(这里是student)查找 相应的节点,返回 DOMNodeList类型的对象,相当于取出了所有的学生。可以用var_dump($students)查看,并根据返回值查找手册,看其下面的属性与方法。
echo "共有 ".$students->length."个学生
";

//3.2 读取第一个学生
$stu1 = $students->item(0);//读取到第一个学生。返回值为DOMElement对象。直接 echo $stu1->nodeValue;则把name,sex,age都输出。
//3.3 取出第一个学生的名字
$stu1_name = $stu1->getElementsByTagName("name");
//3.4 读取到名字
echo $stu1_name->item(0)->nodeValue;
?>

注意点:

(1)编码问题;
(2)这里只是基础演示,比较麻烦,后面用到循环和函数来操作;
(3)用var_dump(),查看变量的返回值是什么,再根据返回值到手册中查找该返回值下的属性与方法。
(4)整个顺序下来,getElementByTagName()并不需要一层一层的读,事实上可以直接读取到节点name的,而不需要先读取student(当然,如果同一个student下,有多个name,就会出问题了,这里就需要学习新的知识点xpath)。

所以上面这代码可以简单改为:

复制代码 代码如下:

//1、创建一个DOMDocument对象。该对象就表示 xml文件
$xmldoc = new DOMDocument();
//2、加载xml文件(指定要解析哪个xml文件,此时dom树节点就会加载到内存中)
$xmldoc->load("class.xml");
//3、目标:获取第一个学生的名字
$stu = $xmldoc->getElementsByTagName("name");//直接找到节点name
$stu1 = $stu->item(0);// item(1)时,可以取到周瑜
echo $stu1->nodeValue;
?>

希望本文所述对大家的php操作XML程序设计有所帮助。

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