Alan Forbes - The Joy of PHP 1

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1 Alan Forbes - The Joy of PHP 1

3 The Joy of Programming PHP Copyright 2013 by Alan Forbes. All rights reserved, including the right to reproduce this book, or portions thereof, in any form. The scanning, hosting, downloading, or otherwise sharing this book over the Internet without the permission of the author is illegal and punishable by law and not very nice. Please encourage me to write another book by buying your own copy. This ebook is for your personal use only. This ebook may not be re-sold or given away to other people. If you would like to share this book with another person, please purchase an additional copy for each person you share it with. If you are reading this book and did not purchase it, or it was not purchased for your exclusive use only, then you should purchase your own copy. Thank you for respecting the hard work of the author who put hundreds of hours of effort into making it all look easy. Alan Forbes - The Joy of PHP 3

4 Table of Contents Introduction...10 Introduction...10 Praise for The Joy of PHP...12 Foreword...13 Sponsors...14 CWS Technology...14 Site Matraex...14 mindworks GmbH...15 Other Kickstarter Backers of Note...15 What is PHP?...16 Introducing PHP...17 Example...18 A little history...19 Installing and Configuring PHP...21 Introduction...21 Windows Users...21 Using WampServer...22 Mac Users...23 How Do I Know it is Working?...23 Oracle VM Virtual Box...25 Installing for a Web Site...25 Exercise...26 Introduction to HTML...27 Introduction...27 Basic HTML...27 Basic Elements of HTML...28 Tags...28 Nested Tags...29 Required tags...29 Alan Forbes - The Joy of PHP 4

5 DocType...29 Head...30 Optional Tags...30 Meta Tags...30 Useful Tags...30 Headers...30 DIV...31 Images/Picture...31 Links...31 Lists...32 Exercise...32 HTML Tables...32 Table Example...33 HTML Table Headers...33 HTML Forms...34 The Input tag...35 HTML Form Actions & Methods...36 Basic PHP Syntax...38 Introduction - Basic PHP Syntax...38 Your first PHP-enabled page Hello World!...38 Some Fun Right Away...40 A Countdown Counter...40 Exercise...42 Editors and Staying Organized...43 Editors...43 Microsoft Expression Web...43 phpstorm...44 EditRocket...45 Free Editors...45 Includes...45 Basic example...46 HTML example...46 Code example...47 Alan Forbes - The Joy of PHP 5

6 Best Practices...47 Variables, Numbers, Dates, and Strings...48 Variables...48 Variable Naming Conventions and Best Practices...49 Numbers...50 Basic Arithmetic...50 Common Arithmetic Shortcuts...51 Useful Numeric Functions...51 Strings...51 Useful String Functions...52 Sources of Documentation...52 Exercise...52 How to Interpret PHP.NET documentation...52 Return Value...54 Function Name...54 Parameters...54 Dates...55 Example: Calculating Age in Years...57 Variable Scope...58 Control Structures...59 Introduction...59 if...59 if... else...60 Exercise: Open Hours...60 PHP Switch...61 PHP Looping...61 PHP while...61 PHP for...62 How to use a database, such as mysql...64 Introduction...64 What are Databases?...64 Getting Started with phpmyadmin...66 What is phpmyadmin?...67 Alan Forbes - The Joy of PHP 6

7 Using phpmyadmin to create a database...67 Introduction to SQL...68 Using phpmyadmin to create a Table in a database...68 Defining our first table...70 What defines an automobile?...70 Datatypes...71 Numbers...71 Characters...71 Dates...71 Exercise: Create a Table...74 Working with SQL Statements...75 INSERT Statements...75 SELECT Statements...76 WHERE Statements...78 Comparison Operators...80 ORDER BY...80 UPDATE Statements...81 DELETE Statements...81 Using mysql and PHP Together...83 Introduction...83 Code!...83 Code Listing: createdb.php...84 Code Explained: createdb.php...87 Hey, where's the HTML?...90 Creating forms to Display, Add, Edit, and Delete data...91 Introduction...91 Forms that Add Data to a Database...91 A Basic Form...91 HTML Code...92 Form Action...92 PHP Code...93 A Brief Time Out...include files...97 Forms that Display Summary Data...99 Code Alan Forbes - The Joy of PHP 7

8 Code Explained Exercise: Tweaking the SELECT Improving the look of the table with CSS CSS Explained Modifying the form to link to the detail page Forms that Display Detail Data Code Code Explained Forms that Edit Data Forms that Delete Data Code to delete data Code Explained Exercise Session Variables Introduction Sessions Starting a PHP Session Using Session Variables Store a variable Retrieve a variable Checking for a variable Destroying a Session Working with Images Introduction Exercise: Viewing Images Pulling an unknown number of images from a database Exercise: Create a Database Table to store images Exercise: Modify the viewcar.php page to show multiple images Code explained PHP File Uploads Introduction Create an Upload File form Create a Script to Process the Uploaded File Alan Forbes - The Joy of PHP 8

9 Code: ViewCarsAddImage.php Code Explained PHP Quirks and Tips Introduction Single Quotes vs Double Quotes The Equal Sign Comparison Operators Security Considerations Introduction Balancing Security and Usability SQL Injection Additional Resources Appendix A: Installing PHP on a Website How to install on a Windows Server How to install on a Linux Server Alan Forbes - The Joy of PHP 9

Table of Contents. Introduction. What is PHP? Introducing PHP Example A little history Installing and Configuring PHP

Table of Contents. Introduction. What is PHP? Introducing PHP Example A little history Installing and Configuring PHP Table of Contents Introduction Introduction What is PHP? Introducing PHP Example A little history Installing and Configuring PHP Introduction Windows Users Using Wampserver Mac Users How Do I Know it is