Advanced PHP for Web Professionals by Christopher Cosentino PDF

By Christopher Cosentino

ISBN-10: 0130085391

ISBN-13: 9780130085399

Take your Hypertext Preprocessor programming talents to the following point, with this hands-on, example-rich instructional! In Advanced personal home page for internet Professionals, best-selling personal home page writer Christopher Cosentino brings jointly dozens of robust new concepts for construction critical net functions. the right way to deal with classes extra successfully, create greater kinds, improve customized blunders handlers, construct database-independent internet purposes with PEAR::DB, parse XML records, authenticate clients through database question, construct cross-platform consumer apps with PHP-GTK, and masses extra!

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A cookie can only hold one value, so storing cookies for each feature option quickly turns into a coding nightmare: When you have more than one or two features, you'd need a cookie for each one! This is where sessions can help. You can store multiple values that can be accessed across many pages. You keep the database queries to a minimum by loading the user preferences at the start of the session, and you only need to worry about storing one cookie on the user's browser, eliminating the worry of exceeding the finite number of cookies any one site can store on a browser.

Session_unregister() and session_unset() are independent of each other. However, do not call session_unregister() before session_unset() if you also want to unset the value of the variable you are unregistering. Unregistering the variable makes that variable untouchable by session_unset(), for it is no longer a session variable. The proper order to unset the variable $name, as well as unregister it, is: session_unset(); session_unregister("name"); You could also do the opposite if you wanted to make sure that a variable was registered and had a value: //If $name has not been registered with the session.

PHP supports link rewriting, which gets around the problems in using cookies to store session information. With link rewriting, PHP alters any links on your page so that they automatically include the $PHPSESSID variable. This does make the links look a little messy to the user, but in some cases it is the only way to be sure that you are accurately tracking a user's session. ini file so that sessions work correctly. ini file. ini will not work correctly under Windows. save_path = C:/temp You could also leave the value as /tmp and create a directory named "tmp" at the root of the drive on which your Web server resides.

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Advanced PHP for Web Professionals by Christopher Cosentino

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