XML for PHP developers Part 1: PHPXML quick start in 15 minutes

Introduction The importance of xml (standardization is getting closer and closer) is hard to ignore in today's application development environment. If I have never processed xml in PHP (standardization is getting closer and closer) or I have no contact with PHP5, this new xml about PHP5 (standardization is getting closer and closer) the function Getting Started Guide can tell you how easy it is to process xml (standardization is getting closer and closer. This series of articles is divided into three parts, this is the first part, mainly introduces the quick start API Introduction

In today's application development environment, it is difficult to ignore the importance of xml (standardization is getting closer and closer. If I have never processed xml in PHP (standardization is getting closer and closer) or I have no contact with PHP5, this new xml about PHP5 (standardization is getting closer and closer) the function Getting Started Guide can tell you how easy it is to process xml (standardization is getting closer and closer. This series of articles is divided into three parts, this is the first part, mainly introduces the quick start API, examples show how to use Simplexml (standardization is getting closer and closer) for simple, predictable, and relatively small xml documents and use DOM when necessary, is an ideal method. These are exactly the documents passed in ajax (static dynamic website) applications, such as the content of the submitted form or the response of the Web service application programming interface (API) such as weather.com.

Xml (standardization is getting closer and closer) basics

A preliminary understanding of xml (standardization is getting closer and closer) helps you understand the importance of xml (standardization is getting closer and closer) for PHP developers, understand and create simple xml (standardization is getting closer and closer) documents.

About xml (standardization is getting closer and closer)

Extensible Markup Language (xml (standardization is getting closer and closer) is called markup language and text-based data storage format, depending on who it is. It is a subset of the standard general Markup Language (SGML) and uses text to apply and describe the tree structure of information. Xml (standardization is getting closer and closer) is the basis of many languages/formats, such as Really Simple Syndication (RSS) and Mozilla xml (standardization is getting closer and closer) User Interface Language (XUL) maximum eXperience Markup Language (Mxml) of Macromedia, Microsoft eXtensible Application Markup Language (XAML), and open-source Java xml (standardization is getting closer and closer) UI Markup Language (XAMJ ). Since xml (standardization is getting closer and closer) exists everywhere, it is really important. Everyone wants to keep up with the xml (standardization is getting closer and closer) trend.

Writing xml (standardization is getting closer and closer)

The basic data unit of xml (standardization is getting closer and closer) is element. The element uses the start tag, as shown in figure And end mark, such Separated. The start tag must contain the end tag. If the end tag is missing, the xml (standardization is getting closer and closer) document is not well structured and the parser cannot parse the document correctly. The tag name usually indicates the type of the content contained in the element. You can imagine that the book element should contain the book title, such as Great American Novel (as shown in listing 1 ). The content between tags, including white space, is called character data.

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