Php example by example

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PHP
Y E X A M P L

E

201 West 103rd Street Indianapolis, Indiana 46290

Toby Butzon

PHP By Example
Copyright© 2002 by Que
All rights reserved. No part of this book shall be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without written permissionfrom the publisher. No patent liability is assumed with respect to the use of the information contained herein. Although every precaution has been taken in the preparation of this book, the publisher and author assume no responsibility for errors or omissions. Nor is any liability assumed for damages resulting from the use of the information contained herein. International Standard Book Number:0-7897-2568-1 Library of Congress Catalog Card Number: 2001090370 Printed in the United States of America First Printing: November 2001 04 03 02 01 4 3 2 1

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Contents at a Glance
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Part I Getting Started with Programming in PHP 5 1 Welcome to PHP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 2 Variables and Constants . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .28 3 Program Input and Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 4 Arithmetic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 5 String Manipulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88 113 . . . . . . . . . . . . . . . . . . . . . .114 . . . . . . . . . . . . . . . . . . . . ..136 . . . . . . . . . . . . . . . . . . . . . .152 . . . . . . . . . . . . . . . . . . . . . .170

Part II Control Structures 6 The if, elseif, and else Statements 7 The switch Statement . . . . . . . . . . . 8 Using while and do-while . . . . . . . . 9 Using for and foreach . . . . . . . . . . .

Part III Organization and Optimization of Your Program 185 10 Functions . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186 11 Classes and Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214 12 Using Include Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .240 Part IV Advanced PHP Features 13 Creating Dynamic Content with PHP and a MySQL Database . . . . . . . . . . . . . . . . . . . . . . . . 14Using PHP for Password Protection . . . . . . . 15 Allowing Visitors to Upload Files . . . . . . . . . 16 Cookies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Putting It All Together . . . . . . . . . . . . . . . . . 261 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .262 .292...