Download Advanced PHP for Web Professionals by Christopher Cosentino PDF

By Christopher Cosentino

Take your Hypertext Preprocessor programming talents to the subsequent point, with this hands-on, example-rich instructional! In complex Hypertext Preprocessor for internet execs, best-selling Hypertext Preprocessor writer Christopher Cosentino brings jointly dozens of strong new thoughts for development critical net purposes. how to deal with periods extra successfully, create greater kinds, improve customized errors handlers, construct database-independent net purposes with PEAR::DB, parse XML documents, authenticate clients through database question, construct cross-platform shopper apps with PHP-GTK, and masses extra!

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    27–30 End the HTML page. Top Unregistering Session Variables You may find that some of the session variables that you register are only needed on a few pages and not across an entire site. You can unregister these variables so that they are no longer tracked with the session. This is done using the session_unregister() function: session_unregister(STRING); The STRING argument is the name of the variable that you want to unregister from the session. Note that using session_unregister doesn't delete the contents of the variable on the current page.

    You may also want to first check to see if the variable is even registered by using the session_is_registered() function: session_is_registered(STRING); For example: //If $name has been registered with the session. if(session_is_registered("name")) { unset($name); session_unregister("name"); } This has the effect of deleting the variable from the session, as well as deleting the variable from the current page. Also, you don't have to unset the variables one at a time. You can unset all session variables by using the command session_unset(): session_unset(); session_unset() takes no arguments and simply deletes the values of any variables currently registered with the session.

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