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Overview
XML stands for Extensible Markup Language (abbreviation of eXtensible Markup Language, meaning extensible markup language). XML is a set of rules that define semantic markup that divides a document into parts and identifies those parts. It is also a meta-markup language, that is, it defines a syntactic language for defining other domain-specific, semantic, and structured markup languages. XML is the hottest technology today. PHP also has the function of analyzing XML documents. Below we will discuss the application of XML in PHP.
Overview of XML
Talking about XML (eXtended Markup Language: Extensible Markup Language), we might as well look at a piece of HTML code first:
<html>
< title>XML</title>
<body>
<p><center><font color="red">TEXT</font></center></p>
<a href= "www.domain.com"><img src="logo.jpg"/></a>
</body>
</html>
The above code is structurally consistent with XML According to the rules, XML can be understood as a tree structure type containing data:
1. When referencing the same element, use consistent case, such as