Tài liệu A Programmer's Introduction to PHP 4.0

Acknowledgments xi
Introduction xiii
How To Use This Book .xv
Part One: The Basics .1
Chapter 1 An Introduction to PHP .3
An Abbreviated History 3
Characteristics of PHP .5
User Affirmations .8
An Introductory Example 9
Downloading PHP/Apache .10
Installation and Configuration 12
PHP Configuration .20
Basic PHP Constructs 23
What’s Next? .29
Chapter 2 Variables and Data Types 31
Integer Values .31
Floating-Point Numbers 32
String Values 33
Arrays 35
Objects .38
Boolean, or True/False, Values .39
Identifiers .40
Variables 41
Type Juggling 46
Type Casting 47
Variable Assignment .48
v
Variable Variables 50
Predefined Variables .50
Constants .53
What’s Next? .53
Chapter 3 Expressions, Operators, and Control Structures .55
Expressions .55
Control Structures .63
Project: Develop an Events Calendar .77
What’s Next? .80
Chapter 4 Functions .81
What Is a Function? 81
Function Definition and Invocation .81
Nested Functions 83
Returning Values from a Function .85
Recursive Functions 88
Variable Functions .88
Building Function Libraries .90
What’s Next? .91
Chapter 5 Arrays .93
Creating Arrays 93
Multidimensional Arrays .96
Referencing Multidimensional Arrays 97
Locating Array Elements 98
Adding and Removing Elements 100
Traversing Arrays .103
Array Size 109
Sorting Arrays 111
Other Useful Functions 117
What’s Next? 120
Chapter 6 Object-Oriented PHP 121
PHP and OOP 122
Classes, Objects, and Method Declarations 122
Contents
vi
Class and Object Functions 135
What’s Next? 142
Chapter 7 File I/O and the File System .143
Verifying a File’s Existence and Size .143
Opening and Closing I/O 145
Writing to a File .147
Reading from a File .148
Reading a File into an Array 153
Redirecting a File Directly to Output 153
Opening a Process File Pointer with popen() .154
Opening a Socket Connection 155
External Program Execution .157
Working with the File System 160
Displaying and Modifying File Characteristics .162
Copying and Renaming Files .164
Deleting Files .165
Working with Directories 165
Project 1: A Simple Access Counter .168
Project 2: A Site Map Generator 169
What’s Next? 173
Chapter 8 Strings and Regular Expressions 175
Regular Expressions .176
PHP’s Regexp Functions (POSIX Extended) 179
Regular Expression Syntax (Perl Style) .183
PHP’s Regexp Functions (Perl Compatible) 185
Other String-Specific Functions 189
Project: Browser Detection .207
What’s Next? 211
Part Two: The Web .213
Chapter 9 PHP and Dynamic Site Development .213
Simple Linking .213
File Components (Basic Templates) .215
Project: Build a Page Generator .225
What’s Next? .
Contents
vii
Chapter 10 Forms 229
An Introduction to Forms 229
Forms and PHP .238
Error Checking .248
Dynamic Forms Construction 250
Project: Create a Guestbook 252
What’s Next? 258
Chapter 11 Databases 259
What Is SQL? .260
PHP’s Extensive Database Support 263
MySQL 264
PHP’s Predefined MySQL Functions 266
ODBC .280
Project: Create a Bookmark Repository 289
What’s Next 297
Chapter 12 Templates 299
What You’ve Learned So Far 299
Developing an Advanced Template System 300
Project: Create an Address Book 312
What’s Next? 318
Chapter 13 Cookies and Session Tracking .321
What Is a Cookie? .321
Unique Identification Numbers 328
Session Handling .331
Project: Create a Visitor Log 345
What’s Next? 351
Part Three: Advanced PHP 353
Chapter 14 PHP and XML .355
A Brief Introduction to Markup .355
An Introduction to XML Syntax .359
Contents
viii
PHP and XML 374
A Final Note About PHP and XML 388
What’s Next? 388
Chapter 15 JavaScript and COM 391
JavaScript 391
The Component Object Model .400
What’s Next 406
Chapter 16 Security .409
Configuration Issues 410
Coding Issues 415
Data Encryption 417
E-Commerce Functions .422
User Authentication .424
Conclusion .429
Index 431
Contents