Secure PHP Development- P2

Secure PHP Development- P2: Welcome to Secure PHP Development: Building 50 Practical Applications. PHPhas come a long way since its first incarnation as a Perl script. Now PHP is a powerfulWeb scripting language with object-oriented programming support. Slowlybut steadily it has entered the non-Web scripting arena often reserved for Perl andother shell scripting languages. Arguably, PHP is one of the most popular Web platforms.
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Secure PHP Development- P2Secure PHP Development: Building 50 Practical ApplicationsPublished byWiley Publishing, Inc.10475 Crosspoint BoulevardIndianapolis, IN 46256www.wiley.comCopyright © 2003 by Wiley Publishing, Inc., Indianapolis, IndianaPublished by Wiley Publishing, Inc., Indianapolis, IndianaPublished simultaneously in CanadaISBN: 0-7645-4966-9Manufactured in the United States of America10 9 8 7 6 5 4 3 2 11B/SU/QU/QT/INNo part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or byany means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permittedunder Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior writtenpermission of the Publisher, or authorization through payment of the appropriate per-copy fee to theCopyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8700.Requests to the Publisher for permission should be addressed to the Legal Department, Wiley Publishing, Inc.,10475 Crosspoint Blvd., Indianapolis, IN 46256, (317) 572-3447, fax (317) 572-4447, E-Mail:permcoordinator@wiley.com.LIMIT OF LIABILITY/DISCLAIMER OF WARRANTY: WHILE THE PUBLISHER AND AUTHOR HAVE USEDTHEIR BEST EFFORTS IN PREPARING THIS BOOK, THEY MAKE NO REPRESENTATIONS ORWARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THISBOOK AND SPECIFICALLY DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY ORFITNESS FOR A PARTICULAR PURPOSE. NO WARRANTY MAY BE CREATED OR EXTENDED BY SALESREPRESENTATIVES OR WRITTEN SALES MATERIALS. THE ADVICE AND STRATEGIES CONTAINEDHEREIN MAY NOT BE SUITABLE FOR YOUR SITUATION. YOU SHOULD CONSULT WITH APROFESSIONAL WHERE APPROPRIATE. NEITHER THE PUBLISHER NOR AUTHOR SHALL BE LIABLEFOR ANY LOSS OF PROFIT OR ANY OTHER COMMERCIAL DAMAGES, INCLUDING BUT NOT LIMITEDTO SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR OTHER DAMAGES.For general information on our other products and services or to obtain technical support, please contact ourCustomer Care Department within the U.S. at (800) 762-2974, outside the U.S. at (317) 572-3993 or fax (317)572-4002.Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may notbe available in electronic books.Library of Congress Cataloging-in-Publication DataLibrary of Congress Control Number: 2003101844Trademarks: Wiley, the Wiley Publishing logo, and related trade dress are trademarks or registeredtrademarks of Wiley Publishing, Inc., in the United States and other countries, and may not be used withoutwritten permission. All other trademarks are the property of their respective owners. Wiley Publishing, Inc., isnot associated with any product or vendor mentioned in this book. is a trademark of Wiley Publishing, Inc.CreditsSENIOR ACQUISITIONS EDITOR VICE PRESIDENT AND EXECUTIVE Sharon Cox PUBLISHER Bob IpsenACQUISITIONS EDITOR Debra Williams Cauley VICE PRESIDENT AND PUBLISHER Joseph B. WikertPROJECT EDITOR Sharon Nash EXECUTIVE EDITORIAL DIRECTOR Mary BednarekDEVELOPMENT EDITORS Rosemarie Graham PROJECT COORDINATOR Maryann Steinhart Dale WhiteTECHNICAL EDITORS GRAPHICS AND PRODUCTION Richard Lynch SPECIALISTS Bill Patterson Beth Brooks Kristin McMullanCOPY EDITORS Heather Pope Elizabeth Kuball Luann Rouff QUALITY CONTROL TECHNICIANS Tyler ConnoleyEDITORIAL MANAGER David Faust Mary Beth Wakefield Andy HollandbeckVICE PRESIDENT & EXECUTIVE GROUP PROOFREADING AND INDEXINGPUBLISHER TECHBOOKS Production Services Richard SwadleyAbout the AuthorMohammed J. Kabir is CEO and founder of EVOKNOW, Inc. His company(www.evoknow.com) develops software using LAMP (Linux, Apache, MySQL, andPHP), Java, and C++. It specializes in custom software development and offerssecurity consulting services to many companies around the globe. When he is not busy managing software projects or writing books, Kabir enjoysriding mountain bikes and watching sci-fi movies. Kabir studied computer engi-neering at California State University, Sacramento, and is also the author of ApacheServer 2 Bible, Apache Server Administrator’s Handbook, and Red Hat Server 8. Youcan contact Kabir via e-mail at kabir@evoknow.com or visit the book’s Web site athttp://www.evoknow.com/publications/books/phpbook.php.PrefaceWelcome to Secure PHP Development: Building 50 Practical Applications. PHPhas come a long way since its first incarn ...