PHP XML Parsers

What is XML?

The eXtensible Markup Language (XML) is a universal format for exchanging data between different computer systems, databases, and third-party applications.

XML is easy to learn. It looks a lot like HTML, except that you make up your own tags.

If you want to learn more about XML, please visit our XML tutorial.

What is an XML Parser?

An XML parser is a program that is designed to read, process and interpret XML documents.

An XML parser translates the raw text in an XML file, and creates a way for programs to easily use and manipulate it.

There are two types of XML parsers:

1. Tree-based Parsers

A Tree-based Parser loads the entire document in memory as a tree structure. It analyzes the whole document, and provides access to the tree elements (DOM).

A tree-based parser is an ideal option for smaller XML documents, but not for large XML documents (as it causes major performance issues).

Examples of tree-based parsers: SimpleXML Parser and DOM Parser.

2. Event-based Parsers

An Event-based Parser does not load the entire document in memory, instead, it reads in one node at a time and allows you to interact with it. Once you move onto the next node, the old one is thrown away.

An event-based parser is well suited for large XML documents. It parses faster and consumes less memory.

Examples of event-based parsers: XMLReader and XML Expat Parser.