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php操作xml入门之xml基本介绍及xml标签元素,xml标签

本文实例讲述了php操作xml入门之xml基本介绍及xml标签元素。分享给大家供大家参考。具体分析如下:

以xml实例来讲解:

复制代码 代码如下:



 
  小乔
 
  23
 

 
  周瑜
 
  27
 


一、xml声明:


(1)、xml声明要放在文档的第一行;
(2)、encoding:文档字符编码,如utf-8、gb2312等。
(3)、standalone:值为yes或者no,可有可无,表示文档定义是否独立,即与其它文档是否有关联。默认为no。

二、根元素

包在最外层的为根元素,每个 xml 文档都必须有且只能有一个根元素。

三、xml 元素/标签/节点

等都是xml的元素,元素也称为标签或节点。当然,根元素也是一元素。
如果标签中没有内容,如之间没有实体内容,则可以简写为。即使是写成,浏览器打开时,也是显示

四、标签中的空格与换行

标签中出现的空格与换行,xml 文档会将空格与换行当作原始内容来处理。所以,在编程时要特别注意。

五、xml标签的命名规范

(1)区分大小写;
(2)不能以数字或“_”开头;
(3)不能以 xml、XML、Xml等特殊字符开头;
(4)不能包含空格;
(5)不能包含冒号。

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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