Learning PHP 5

By David Sklar

PHP has received a following between non-technical internet designers who have to upload interactive facets to their websites. delivering a gradual studying curve, Hypertext Preprocessor is an obtainable but strong language for developing dynamic websites. As its reputation has grown, PHP's uncomplicated function set has develop into more and more subtle. Now personal home page five boasts complicated features--such as new object-oriented functions and help for XML and internet Services--that will please even the main skilled internet pros whereas nonetheless final trouble-free adequate for people with a reduce tolerance for technical jargon.

If you will have desired to test your hand at personal home page yet have not identified the place to begin, then Learning personal home page 5 is the ebook you would like. If you may have desired to try out your hand at Hypertext Preprocessor yet have not recognized the place to begin, then Learning Hypertext Preprocessor 5 is the ebook you wish. With consciousness to either personal home page four and the hot Hypertext Preprocessor model five, it presents every thing from a rationalization of ways personal home page works together with your net server and net browser to the bits and bobs of operating with databases and HTML kinds. Written by way of the co-author of the preferred PHP Cookbook, this publication is for clever (but now not inevitably highly-technical) readers. Learning Hypertext Preprocessor 5 courses you thru each element of the language you will have to grasp for pro internet programming effects. This ebook presents a hands-on studying adventure whole with routines to ensure the teachings stick.

Learning Hypertext Preprocessor 5 covers the subsequent subject matters, and more:

  • How personal home page works together with your net browser and net server
  • PHP language fundamentals, together with info, variables, good judgment and looping
  • Working with arrays and functions
  • Making internet forms
  • Working with databases like MySQL
  • Remembering clients with sessions
  • Parsing and producing XML
  • Debugging

Written by way of David Sklar, coauthor of the PHP Cookbook and an teacher in personal home page, this ebook deals the right school room studying event even if you are in a school room or by yourself. From studying the best way to set up Hypertext Preprocessor to designing database-backed net purposes, Learning Hypertext Preprocessor 5 will consultant you thru each point of the language you will want to grasp to accomplish expert internet programming results.

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Output_buffering On while this can be on, the Hypertext Preprocessor interpreter waits till your script runs earlier than it sends HTTP headers, making it more uncomplicated to take advantage of cookies and periods. See part eight. 6 in bankruptcy eight. register_globals Off whilst this can be on, the personal home page interpreter creates person variables for every submitted shape or URL variable. for instance, the worldwide variable dinner might comprise the price of the submitted shape parameter dinner. Turning this on opens your Hypertext Preprocessor courses as much as plenty of protection dangers. don't flip this on.

Instance 2-16. Math operations print 2 + 2; print 17 - three. five; print 10 / three; print 6 * nine; The output of instance 2-16 is: four thirteen. five three. 3333333333333 fifty four as well as the plus signal (+) for addition, the minus signal (-) for subtraction, the ahead diminish (/) for department, and the asterisk (*) for multiplication, personal home page additionally helps the percentage signal (%) for modulus department. This returns the rest of a department operation: print 17 % three; This prints: 2 considering 17 divided by way of three is five with a rest of 2, 17 % three equals 2.

Utilizing the SQL INSERT command. placing information into the database with question( ). Checking for database error with DB::isError( ). establishing automated blunders dealing with with setErrorHandling( ). utilizing the SQL replace and DELETE instructions. altering or deleting information with question( ). Counting the variety of rows stricken by a question. utilizing placeholders to insert facts correctly. producing precise identity values with sequences. utilizing the SQL pick out command. Retrieving information from the database with question( ) and fetchRow( ). Counting the variety of rows retrieved through question( ).

Htmlentities($user) . ':
'; print file_get_contents("/usr/local/data/$user"); If a malicious person provides .. /.. /.. /etc/passwd because the consumer shape parameter in instance 10-23, that's translated into etcpasswd sooner than being interpolated into the filename used with file_get_contents( ) . one other useful process for buying rid of user-entered nastiness is to exploit realpath( ) . It interprets an obfuscated filename that comprises .. sequences into the .. -less model of filename that extra without delay shows the place the dossier is.

To strength a definite order at the back rows, upload an ORDER through clause for your pick out. instance 7-41 returns all of the rows within the dishes desk ordered through cost, lowest to optimum. instance 7-41. Ordering rows lower back from a choose question decide on dish_name FROM dishes ORDER by way of expense to reserve from optimum to lowest worth, upload DESC after the column that the consequences are ordered through. instance 7-42 returns the entire rows within the dishes desk ordered by means of fee, maximum to lowest. instance 7-42. Ordering from maximum to lowest pick out dish_name FROM dishes ORDER by means of fee DESC you could specify a number of columns to reserve via.

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