PHP 5问题解决方案大全：实践篇

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"《PHP 5 Recipes: A Problem-Solution Approach》是由四位经验丰富的作者Lee Babin、Nathan A. Good、Frank M. Kromann和Jon Stephens合著的一本专著，于2005年9月23日由Apress出版社发行。这本书以其问题-解决方案的方法论，深入探讨了PHP 5语言在实际开发中的应用和挑战。它提供了672页的内容，旨在帮助读者通过解决实际问题来提升他们的PHP编程技能。作为一本技术指南，书中涵盖了PHP 5的关键特性和技术，包括但不限于数据类型、面向对象编程、数据库操作、网络编程、安全性、性能优化以及Web服务等方面。每一章都围绕一个具体问题展开，通过详细的步骤和实例，使读者能够理解和掌握如何在项目中有效地利用PHP 5来解决问题。在版权方面，该书受到严格的保护，未经版权所有者和出版商的书面许可，禁止任何形式的复制或传输。此外，书中还可能涉及商标使用，这些商标仅在编辑性引用中出现，以尊重和维护商标所有者的权益。《PHP 5 Recipes》由Chris Mills担任主编辑，Rob Kunkle负责技术审阅，Steve Anglin、Dan Appleman等多名专家组成的编辑委员会确保了内容的专业性和质量。项目的执行工作则由Grace Wong担任副出版商，Kylie Johnston负责项目管理，以及一支严谨的团队共同完成。这是一本实用的工具书，不仅适合初学者学习PHP 5基础知识，也适合有经验的开发者查阅和解决他们在项目开发中遇到的问题，是提升PHP 5技能和实践经验的重要参考资料。"

About the Authors

■LEE BABIN is a programmer based in Calgary, Alberta, where he serves as

the chief programmer for an innovative development firm duly named

The Code Shoppe. He has been developing complex web-driven applica-

tions since his graduation from DeVry University in early 2002 and has

since worked on more than 50 custom websites and online applications.

Lee is married to a beautiful woman, Dianne, who supports him in his

rather full yet rewarding work schedule. He enjoys playing video games,

working out, practicing martial arts, and traveling and can usually be

found working online on one of his many fun web projects. While Lee

has experience in a multitude of web programming languages, his preference has always been

PHP. W ith the release of PHP 5, many of his wishes have been fulfilled.

■NATHAN A. GOOD is an author, software engineer, and system administrator

in the Twin Cities in Minnesota. He fancies himself a regular Renaissance

man but is known by his friends as having delusions of grandeur. His

books include Professional Red Hat Enterprise Linux 3 (Wrox, 2004),

Regular Expression Recipes: A Problem-Solution Approach (Apress, 2005),

and Regular Expressions for Windows Developers: A Problem-Solution

Approach (Apress, 2005).

When Nathan is not working at a computer (which is rare), he spends

time with his family, spends time at church, and during the three weeks of

summer in Minnesota enjoys kayaking and biking.

■FRANK M. KROMANN is the senior software engineer at intelleFLEET,

where he is responsible for software design and development as well as

hardware integration. Most of this work is done as database-driven web

applications and involves a combination of centralized Linux servers

and decentralized Linux and Windows XP systems (touch-screen com-

puters) for data acquisition.

Frank has been involved with PHP development since 1997; he has

contributed several extensions to the project, has worked on countless

others, and was responsible for the Windows version of PHP-GTK.

When he is not writing code, you can find him on a golf course in Southern California or

having fun with his family.

5092_Ch00_FM_FINAL 8/26/05 5:32 PM Page xv

Introduction

As the Internet continues to evolve, so too does the necessity for a language that addresses

the functionality needs of the Internet’s web viewers. Over time, some programming lan-

guages have come and gone, and others have continued to evolve. Several languages have

moved into the lead in the race for supremacy. Although languages such as ColdFusion,

ASP.NET, and CGI certainly have their advantages, PHP seems to be the developer’s choice

for a versatile, open-source solution.

PHP has grown over the years and, thanks to its devotees, has continued to adopt the

functionality most preferred by its user base. By actually listening to the developers to help

guide PHP’s development path, the PHP creators have introduced some impressive function-

ality over the years. However, PHP 4, while a sound developmental language and tool, was

lacking on a few fronts. For instance, it had a means for developers to take an object-oriented

approach, but several key pieces of functionality were not implemented, such as exception

handling and session support (for objects).

PHP 5 has changed all that. No longer must developers write classes that are missing

functionality. Available to PHP is a full set of object-oriented development tools. Of particular

note in PHP 5 is the ability to protect class variables in several ways. In addition, inheritance

difficulties are now a thing of the past, and exception handling has become a nice way of tak-

ing care of pesky errors and validation.

Thankfully, while PHP 5 has continued to develop, so too have the many extensions

that work alongside it. Several key extensions are bundled with the download package; for

instance, those who follow the MySQL database’s continued evolution will be happy to find

that the new mysqli extension contains a large set of functionality to help you work with

queries in a much more object-oriented way and to help speed up the efficiency of database-

driven web projects.

Further, the process of creating dynamic images has been improved; it is no longer diffi-

cult to install the GD2 library. Instead, it is bundled in PHP 5 from the start. All the bugs from

recent incarnations of the GD library seem to have been dealt with, and creating images using

the PHP 5 engine is simple and effective.

As web developers (and otherwise) continue to see XML as the be-all and end-all of portable

data storage, PHP 5 has gracefully adopted such functionality in the form of Simple XML, which is

a set of easy-to-use, custom-made, object-oriented methods for working with XML.

We could go on and on about the additions to PHP 5 that are getting rave reviews, but it is

much more helpful to actually see such functionality at work. While advancements in technol-

ogy take place every day, it is the actual implementation of such technology that brings

forward movement to the world.

Therefore, to show you some of the new PHP 5 functionality in real-world situations, this

book includes recipes that will allow you to simply drop code into your already custom-built

applications. By covering the vast scope of web applications, this book’s authors—with spe-

cialties in custom applications, database design, and Internet functionality—have devised a

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