Retiring, March 2020 - sorry, you have missed our final public course.
The Coronavirus situation has lead us to suspend public training - which was on the cards anyway, with no plans to resume
Please ask about private 'maintenance' training for Python, Tcl, Perl, PHP, Lua, etc
Happily continuing private consultancy / programming work
Debugging multipage (session based) PHP applications
function allows you to dump out the contents of a variable - and that includes more complex variables like arrays containing other arrays, objects, etc ... in a human (programmer!) readable form. By default, the output string is directly sent to the browser, but with a second parameter that's a true value, it is returned to you for further processing.
Here's an example of print_r's output being decorated to allow for special characters and to retain the spacing so that it can be displayed via the browser:
<?php print ("<pre>".htmlspecialchars(print_r($_SESSION,1))."</pre>"); ?>
And here is a sample of that running in our session demonstration:
(run the demonstration here
with that extra trace line now added; you'll find that our wrapper is maintaining your session history too, but that's another story!)
This is a particularly useful facility to use if you're debugging a multipage application and want to see how the data is passed from one page to another.
- if you alter the PHP script that's running a multipage application, you'll probably need to delete the session cookie too ... otherwise you will have changed the program but your testing would continue with the old data! (written 2009-07-09)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesH310 - PHP - Putting it all together 
Your PHP website - how to factor and refactor to reduce growing pains - (2011-09-24) 
Syncronise - software, trains, and buses. Please! - (2010-08-22) 
A PHP example that lets your users edit content without HTML knowledge - (2010-02-14) 
Index Card System for Game Characters in PHP - (2008-12-27) 
Validating Credit Card Numbers - (2008-10-14) 
Refactoring - a PHP demo becomes a production page - (2008-09-12) 
Upgrade from PHP 4 to PHP 5 - the TRY issue - (2008-08-15) 
Larger applications in PHP - (2008-07-22) 
Presentation, Business and Persistence layers in Perl and PHP - (2006-04-17) 
Stand alone PHP programs - (2005-10-18)
Some other Articles
Understanding the new local government structure in WiltshireFirst courses for 2010Python classes / courses - what version do we train on?Who is Marc Schneider of Multilingual Search Engine Optimization IncDebugging multipage (session based) PHP applicationsPHP preg functions - examples and comparisionThree recent questions on Tomcat ConvertorsMonitoring and loading tools for testing Apache TomcatDogs Trust, Dog Show, NewburyWiltshire - a chance to improve life for everybody
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