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This week, we're updating our course layouts and descriptions. Presentation and materials always gently change over time, but just occasionally there's a need to make a step change to clear out some of the old and roll in the new. That's now happening - but over a long and complex site it's not instant and you'll see sections of the site changing up to and including 19th September.

See also [here] for status update
 
Resetting session based tests in PHP

I was writing and testing a PHP session based application - one in which a series of pages are linked together to make up a complete system - yesterday. And as ever with testing, bugs were found in the code and other things had to be added that meant it needed to be changed.

But it's rather different changing a session based applicaion between pages - in essence, you are modifying an application while it is running and that means that variables you need may not be set, and variables may be set when they should not be. And it almost certainly won't start testing back at the beginning.

The first options to solve the issue is to clear out your session cookie - probably called PHPSESSID if the application is in PHP - and start again. But that can be a lot of fiddling with the browser, and can result in other cookies that you would rather retain being lost. Here's an alternative I came up with - my page has a $_SESSION[current] variable through which I remember where I am in the task. And I simply added the "reset line" to my mode below.

if (! $_SESSION[current]) {
  $current = 0;
} else {
  $current = $_SESSION[current];
}
if ($_REQUEST[reset]) $current = 0;


And I can now restart my application (subject to remembering that not all of the old variables may be cleared!) by adding &reset=1 or ?reset=1 onto the end of the test URL.
(written 2007-08-26, updated 2007-08-28)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
G996 - Well House Consultants - Newsletter Scripts
  [3179] Oops - I typed ci not vi, and have lost my file ... - (2011-02-21)
  [2539] Changing Images - (2009-12-17)
  [2433] Controlling, supressing, enabling PHP error messages - (2009-10-02)
  [2360] Error Handling in Lua with assert and pcall - (2009-08-13)
  [2259] Grouping rows for a summary report - MySQL and PHP - (2009-06-27)
  [2145] Using the internet to remotely check for power failure at home (PHP) - (2009-04-29)
  [2046] Finding variations on a surname - (2009-02-17)
  [1954] mod_rewrite for newcomers - (2008-12-20)
  [1813] Ajax - going Asyncronous and what it means - (2008-09-28)
  [1743] First class functions in Lua lead to powerful OO facilities - (2008-08-07)
  [1665] Factory method example - Perl - (2008-06-04)
  [1601] Replacing the last comma with an and - (2008-04-04)
  [1505] Script to present commonly used images - PHP - (2008-01-13)
  [1487] Efficient PHP applications - framework and example - (2007-12-28)
  [1387] Error logging to file not browser in PHP - (2007-10-11)
  [1217] What are factory and singleton classes? - (2007-06-04)
  [1123] mysqldump and mysqlrestore - (2007-03-30)
  [1066] Final, Finally and Finalize - three special words in Java - (2007-02-05)
  [1001] .pdf files - upload via PHP, store in MySQL, retrieve - (2006-12-19)

H115 - Designing PHP-Based Solutions: Best Practice
  [4118] We not only teach PHP and Python - we teach good PHP and Python Practice! - (2013-06-18)
  [4069] Even early on, separate out your program from your HTML! - (2013-04-25)
  [3926] Filtering PHP form inputs - three ways, but which should you use? - (2012-11-18)
  [3820] PHP sessions - a best practice teaching example - (2012-07-27)
  [3813] Injection Attacks - PHP, SQL, HTML, Javascript - and how to neutralise them - (2012-07-22)
  [3539] Separating program and artwork in PHP - easier maintainance, and better for the user - (2011-12-05)
  [2679] How to build a test harness into your PHP - (2010-03-16)
  [2430] Not just a PHP program - a good web application - (2009-09-29)
  [2221] Adding a newsfeed for your users to a multipage PHP application - (2009-06-06)
  [2199] Improving the structure of your early PHP programs - (2009-05-25)
  [1794] Refactoring - a PHP demo becomes a production page - (2008-09-12)
  [1694] Defensive coding techniques in PHP? - (2008-07-02)
  [1623] PHP Techniques - a workshop - (2008-04-26)
  [1533] Short and sweet and sticky - PHP form input - (2008-02-06)
  [1490] Software to record day to day events and keep an action list - (2007-12-31)
  [1482] A story about benchmarking PHP - (2007-12-23)
  [1391] Ordnance Survey Grid Reference to Latitude / Longitude - (2007-10-14)
  [1390] Converting from postal address to latitude / longitude - (2007-10-13)
  [1389] Controlling and labelling Google maps via PHP - (2007-10-13)
  [1381] Using a MySQL database to control mod_rewrite via PHP - (2007-10-06)
  [1323] Easy handling of errors in PHP - (2007-08-27)
  [1194] Drawing hands on a clock face - PHP - (2007-05-19)
  [1182] Painting a masterpiece in PHP - (2007-05-10)
  [1181] Good Programming practise - where to initialise variables - (2007-05-09)
  [1166] Back button - ensuring order are not submitted twice (PHP) - (2007-04-28)
  [1052] Learning to write secure, maintainable PHP - (2007-01-25)
  [1047] Maintainable code - some positive advice - (2007-01-21)
  [945] Code quality counts - (2006-11-26)
  [936] Global, Superglobal, Session variables - scope and persistance in PHP - (2006-11-21)
  [896] PHP - good coding practise and sticky radio buttons - (2006-10-17)
  [839] Reporting on the 10 largest files or 10 top scores - (2006-08-20)
  [572] Giving the researcher power over database analysis - (2006-01-22)
  [563] Merging pictures using PHP and GD - (2006-01-13)
  [426] Robust checking of data entered by users - (2005-08-27)
  [394] A year on - should we offer certified PHP courses - (2005-07-28)
  [340] Code and code maintainance efficiency - (2005-06-08)
  [261] Putting a form online - (2005-03-29)
  [237] Crossfertilisation, PHP to Python - (2005-03-06)
  [123] Short underground journeys and a PHP book - (2004-11-19)

H116 - Shopping Cart Application in PHP
  [1634] Kiss and Book - (2008-05-07)


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Java - Client side applet applications as well as server side
Well House Manor appoints a General Manager
Flash - is it available to your web page?
Resetting session based tests in PHP
Perl for Larger Projects - Object Oriented Perl
Customer feedback - lifeblood of a business
Well House Manor - feature comparison against the old place!
2008 course schedule - Perl, Python, PHP, Linux, Java Deployment, Ruby and more
Filtering and altering Perl lists with grep and map
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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