PHP & MySQL® Everyday Apps for dummies

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PHP & MySQL® Everyday Apps for dummiesPHP & MySQL®Everyday Apps FORDUMmIES ‰ by Janet ValadePHP & MySQL®Everyday Apps FORDUMmIES ‰PHP & MySQL®Everyday Apps FORDUMmIES ‰ by Janet ValadePHP & MySQL® Everyday Apps For Dummies®Published byWiley Publishing, Inc.111 River StreetHoboken, NJ 07030-5774www.wiley.comCopyright © 2005 by Wiley Publishing, Inc., Indianapolis, IndianaPublished by Wiley Publishing, Inc., Indianapolis, IndianaPublished simultaneously in CanadaNo part of this publication may be reproduced, stored in a retrieval system or transmitted in any form orby any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permit-ted under 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) 646-8600.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) 572-4355, or online athttp://www.wiley.com/go/permissions.Trademarks: Wiley, the Wiley Publishing logo, For Dummies, the Dummies Man logo, A Reference for theRest of Us!, The Dummies Way, Dummies Daily, The Fun and Easy Way, Dummies.com, and related tradedress are trademarks or registered trademarks of John Wiley & Sons, Inc. and/or its affiliates in the UnitedStates and other countries, and may not be used without written permission. MySQL is a registered trade-mark of MySQL AB Limited Company. All other trademarks are the property of their respective owners.Wiley Publishing, Inc., is not associated with any product or vendor mentioned in this book.LIMIT OF LIABILITY/DISCLAIMER OF WARRANTY: THE PUBLISHER AND THE AUTHOR MAKE NO REP-RESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CON-TENTS OF THIS WORK AND SPECIFICALLY DISCLAIM ALL WARRANTIES, INCLUDING WITHOUTLIMITATION WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE. NO WARRANTY MAY BE CRE-ATED OR EXTENDED BY SALES OR PROMOTIONAL MATERIALS. THE ADVICE AND STRATEGIES CON-TAINED HEREIN MAY NOT BE SUITABLE FOR EVERY SITUATION. THIS WORK IS SOLD WITH THEUNDERSTANDING THAT THE PUBLISHER IS NOT ENGAGED IN RENDERING LEGAL, ACCOUNTING, OROTHER PROFESSIONAL SERVICES. IF PROFESSIONAL ASSISTANCE IS REQUIRED, THE SERVICES OF ACOMPETENT PROFESSIONAL PERSON SHOULD BE SOUGHT. NEITHER THE PUBLISHER NOR THEAUTHOR SHALL BE LIABLE FOR DAMAGES ARISING HEREFROM. THE FACT THAT AN ORGANIZATIONOR WEBSITE IS REFERRED TO IN THIS WORK AS A CITATION AND/OR A POTENTIAL SOURCE OF FUR-THER INFORMATION DOES NOT MEAN THAT THE AUTHOR OR THE PUBLISHER ENDORSES THE INFOR-MATION THE ORGANIZATION OR WEBSITE MAY PROVIDE OR RECOMMENDATIONS IT MAY MAKE.FURTHER, READERS SHOULD BE AWARE THAT INTERNET WEBSITES LISTED IN THIS WORK MAY HAVECHANGED OR DISAPPEARED BETWEEN WHEN THIS WORK WAS WRITTEN AND WHEN IT IS READ.For general information on our other products and services, please contact our Customer CareDepartment within the U.S. at 800-762-2974, outside the U.S. at 317-572-3993, or fax 317-572-4002.For technical support, please visit www.wiley.com/techsupport.Wiley also publishes its books in a variety of electronic formats. Some content that appears in print maynot be available in electronic books.Library of Congress Control Number: 2005923782ISBN-13: 978-0-7645-7587-7ISBN-10: 0-7645-7587-2Manufactured in the United States of America10 9 8 7 6 5 4 3 2 11O/SQ/QW/QV/INAbout the Author Janet Valade has 20 years of experience in the computing field. Her back- ground includes work as a technical writer for several companies, as a Web designer/programmer for an engineering firm, and as a systems analyst in a university environment where, for over ten years, she supervised the installa- tion and operation of computing resources, designed and developed a state- wide data archive, provided technical support to faculty and staff, wrote numerous technical papers and documentation, and designed and presented seminars and workshops on a variety of technology topics. Janet currently has two published books: PHP & MySQL For Dummies, 2nd Edition, and PHP 5 For Dummies. In addition, she has authored chapters for several Linux and Web development books.Dedication This book is dedicated to anyone who finds it useful.Author’s Acknowledgments I wish to express my appreciation to the entire Open Source community. Without those people who give their time and talent, there would be no cool PHP for me to write about. Furthermore, I never would have learned this soft- ware without the PHP lists wh ...