For 2021 - online Python 3 training - see ((here)).
Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.
Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
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 
Stand alone PHP programs - (2005-10-18) 
Presentation, Business and Persistence layers in Perl and PHP - (2006-04-17) 
Larger applications in PHP - (2008-07-22) 
Upgrade from PHP 4 to PHP 5 - the TRY issue - (2008-08-15) 
Refactoring - a PHP demo becomes a production page - (2008-09-12) 
Validating Credit Card Numbers - (2008-10-14) 
Index Card System for Game Characters in PHP - (2008-12-27) 
A PHP example that lets your users edit content without HTML knowledge - (2010-02-14) 
Syncronise - software, trains, and buses. Please! - (2010-08-22) 
Your PHP website - how to factor and refactor to reduce growing pains - (2011-09-24)
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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