All 7 XML Handling in PHP questions
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How does SimpleXML let you access nested elements and attributes within an XML document using a natural, object like syntax? How does the DOM extension provide a more powerful and flexible alternative to SimpleXML when you need to actually modify or construct an XML document rather than only read one? What is XPath, and how does it let you query and extract specific elements from an XML document using a powerful, standardized path based query syntax? Why is protecting against XML external entity attacks, commonly abbreviated as XXE, an important security consideration when parsing XML documents that come from an untrusted or external source? How can you efficiently parse an extremely large XML file that would be too large to comfortably load entirely into memory at once, using a streaming based approach like XMLReader? In a modern PHP application that primarily uses JSON for its APIs, when might you still legitimately need to work with XML, and what strategies help cleanly integrate XML handling into an otherwise JSON centric codebase?
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What is XML, and what are the common built in ways PHP lets you read and parse an XML document?

Beginner

Answer

XML, short for Extensible Markup Language, is a structured text format used for representing hierarchical data using nested tags, similar in spirit to HTML but designed specifically for storing and transporting data rather than for visual display, and PHP provides several built in ways to work with XML, including the SimpleXML extension, which offers a straightforward, object like way to read and navigate a simple XML document's structure, making it a common first choice for many everyday XML parsing tasks.
$xml = simplexml_load_string('<book><title>PHP Basics</title></book>');
echo $xml->title;
Real-world example A configuration system reads a simple XML configuration file using SimpleXML, letting the application easily access individual configuration values by simply referencing them as if they were regular object properties.

Common follow-ups: What other XML parsing approaches does PHP provide besides SimpleXML?;What are the main limitations of SimpleXML compared to more advanced XML parsing approaches?

JSON Handling in PHP;Basics & Types
All 7 XML Handling in PHP questions