PHP by Example

PHP By Example will provide web-publishing oriented individuals the opportunity to learn a new, flexible Internet scripting language, PHP. This book will take the reader through step-by-step examples that will help them gain an understanding of PHP. PHP By Example will: Explain concepts in simple, understandable tasks with multiple approaches to concepts that need clarification. Encourage and train the reader to break problems down into logical steps. PHP BY EXAMPLE......Page 2 Copyright......Page 3 Contents at a Glance......Page 4 Table of Contents......Page 5 Introduction......Page 14 Part I Getting Started with Programming in PHP......Page 18 1 Welcome to PHP......Page 20 Why PHP?......Page 21 If You’re New to Programming.........Page 23 Writing a Basic PHP Program......Page 24 Server-Side Versus Client-Side Scripting......Page 35 Running Your New Program......Page 37 What’s Next......Page 40 2 Variables and Constants......Page 42 Introduction to Variables and Constants......Page 43 Declaration and Assignment......Page 45 Variable Types......Page 49 Scope......Page 55 Type Casting......Page 56 Variable References......Page 58 What’s Next......Page 60 3 Program Input and Output......Page 62 Revisiting Output......Page 63 Program Input......Page 73 What’s Next......Page 82 4 Arithmetic......Page 84 Basic Arithmetic......Page 85 Order of Operations......Page 91 Compound Operators......Page 96 Patterns and Arithmetic......Page 99 What’s Next......Page 100 5 String Manipulation......Page 102 The String Concatenation Operator......Page 103 String Functions......Page 105 Pattern Matching with Regular Expressions......Page 113 What’s Next......Page 124 Part II Control Structures......Page 126 6 The if, elseif, and else Statements......Page 128 Basic Conditionals......Page 129 Expressing Multiple Conditions......Page 143 Short Circuit Evaluation......Page 146 What’s Next......Page 148 7 The switch Statement......Page 150 Introducing the switch Statement......Page 151 Multifunction Pages......Page 159 What’s Next......Page 163 8 Using while and do-while......Page 166 The while Statement......Page 167 The do-while Statement......Page 177 The break and exit Statements......Page 179 What’s Next......Page 182 9 Using for and foreach......Page 184 Syntax......Page 185 Comparing for and while......Page 190 The foreach Statement......Page 191 What’s Next......Page 197 Part III Organization and Optimization of Your Program......Page 198 10 Functions......Page 200 Understanding Functions......Page 201 Passing Values to and from Functions......Page 206 Referenced Parameters......Page 217 Recursive Functions......Page 222 What’s Next......Page 226 11 Classes and Objects......Page 228 What Are Classes and Objects?......Page 229 Object-Oriented Programming Concepts......Page 240 serialize() and unserialize()......Page 244 Subclasses and Inheritance......Page 248 What’s Next......Page 252 12 Using Include Files......Page 254 Understanding include......Page 255 Why Use includes?......Page 258 What’s Next......Page 272 Part IV Advanced PHP Features......Page 274 13 Creating Dynamic Content with PHP and a MySQL Database......Page 276 The Idea Behind Database-Driven Content......Page 277 Designing and Creating a Table in MySQL......Page 279 Using MySQL to Make Your Web Site Come Alive......Page 292 What’s Next......Page 304 14 Using PHP for Password Protection......Page 306 Setting Up the Basics......Page 307 Verifying the Username and Password......Page 310 Practical Techniques......Page 313 Using HTTP Header Authentication......Page 321 What’s Next......Page 325 15 Allowing Visitors to Upload Files......Page 328 File Upload Process Overview......Page 329 Creating a File Upload Form......Page 330 Handling the File Upload Request......Page 332 What’s Next......Page 346 Cookie Overview......Page 350 Setting Cookies......Page 352 What’s Next......Page 364 17 Putting It All Together......Page 366 Writing a Full Program......Page 367 Setting Up the Database......Page 376 The Guestbook Program......Page 377 What’s Next......Page 384 Appendix......Page 386 Understanding Error Messages......Page 388 Variable Tracking......Page 391 Glossary......Page 400 Index......Page 408 PHP By Example will provide Web-publishing oriented individuals the opportunity to learn a new, flexible Internet scripting language, PHP. This book will take the reader through step-by-step examples that will help them gain an understanding of PHP. PHP By Example will explain concepts in simple, understandable tasks with multiple approaches to concepts that need clarification, and encourage and train the reader to break problems down into logical steps