PHP by Example: A Practical Guide to Creating Web Applications with PHP

Table of Contents....5

About the Author....10

About the Technical Reviewer....11

Acknowledgments....12

Introduction....13

Chapter 1: The First Program....26

The Programs Code....26

The Interpreter Regime....28

The Server Regime....43

Summary....50

Chapter 2: Variables and Data Types....52

Introduction to Variables....52

Basic Data Types....56

The Arithmetic Operations....59

The Comparison Operations....62

The Logical Operations....64

The Bitwise Operations....66

The Operations with Strings....71

Assigning Values....73

The Ternary Operator....74

Summary....77

Chapter 3: The Control Statements....78

The if Conditional Statement....78

The while Loop Statement....87

The do-while Loop Statement....91

The for Loop Statement....94

The switch Selection Statement....99

The goto Instruction....107

The match Selection Statement....109

Summary....114

Chapter 4: Arrays....116

Getting Familiar with Arrays....117

A Loop over an Array....124

Multidimensional Arrays....132

Array Assignments....136

Concatenating Arrays....140

Comparing Arrays....142

Functions for Handling Arrays....144

Summary....150

Chapter 5: Functions....151

Creating Functions....151

The Function Result....156

The Type of Arguments and Result....161

The Argument Passing Mechanism....165

The Argument Value by Default....169

An Arbitrary Number of Arguments....171

Recursion....180

The eval() Function....183

Anonymous Functions....186

Named Arguments....188

Summary....193

Chapter 6: Useful Tricks and Operations....195

References....195

Constants....201

Global Variables....203

Static Variables....206

Multiline Strings....208

Using Files....211

Including a File in the Program....218

Summary....220

Chapter 7: Classes and Objects....222

The OOP Principles....222

Creating Classes and Objects....225

The Methods....230

The Constructor and the Destructor....234

Static Fields and Methods....238

Copying Objects....240

Private Fields and Methods....243

Special Methods....246

Defining Fields in the Constructor....258

Summary....262

Chapter 8: Inheritance....265

Creating a Child Class....265

Overriding Methods....270

Constructors and Inheritance....275

Inheritance and Private Members....279

Protected Members of a Class....281

Virtual Methods....283

A Function as a Field Value....285

Multilevel Inheritance....288

Summary....293

Chapter 9: Advanced OOP Mechanisms....295

Abstract Classes....295

Interfaces....300

Interface Inheritance....303

Class Inheritance and Interface Implementation....305

Traits....307

Object Type Control....310

A Namespace....314

Anonymous Classes....320

Summary....322

Chapter 10: Error Handling....325

Exception Handling Principles....325

Exception Classes....329

Throwing Exceptions....332

The Custom Exceptions....336

Handling Exceptions of Different Classes....340

Nested try-catch Constructions and the finally Block....346

Rethrowing an Exception....350

The Functions for Handling Errors....352

Summary....355

Chapter 11: Generators and Iterators....356

Getting Familiar with Generators....356

A Generator Function with Arguments....360

An Array Based on a Generator....362

The Generator Result....364

Using Generators....367

Passing a Value to a Generator....372

Iterators....374

Summary....380

Chapter 12: Using PHP....382

A Script in an HTML Document....382

Handling the Request Parameters....390

Using Buttons....394

Using Several Buttons....402

Using Lists and Checkboxes....407

A Slider and Radio Buttons....415

Summary....423

Chapter 13: Afterword: What Was and What Will Be....425

Index....427

Learn to create web applications in PHP with minimal previous experience. This book is a practical guide to using PHP for web development.

Loaded with examples and step-by-step instructions, each chapter is dedicated to a specific area or function. You’ll first review the main principles of PHP and what is needed to program and develop in it. You’ll then study variables, data types, control statements, arrays, and functions, all critical for creating efficient PHP programs.

The book then moves on to object-oriented programming (OOP) and how to implement those principles in PHP, as well as inheritance, interfaces, testing, error handling, and exceptions. By the end of PHP by Example, you will have the knowledge and confidence to implement PHP for your web projects both large and small.

What You’ll Learn

• Understand PHP from the ground up
• Create scripts and implement them in real-world projects
• Work with a broad toolkit of ready-made exercises and solutions
• Investigate the main constructions of the PHP