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
PHP's print_r 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.
Remember - 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 articles H310 - PHP - Putting it all together [468] Stand alone PHP programs - (2005-10-18) [687] Presentation, Business and Persistence layers in Perl and PHP - (2006-04-17) [1716] Larger applications in PHP - (2008-07-22) [1754] Upgrade from PHP 4 to PHP 5 - the TRY issue - (2008-08-15) [1794] Refactoring - a PHP demo becomes a production page - (2008-09-12) [1840] Validating Credit Card Numbers - (2008-10-14) [1962] Index Card System for Game Characters in PHP - (2008-12-27) [2635] A PHP example that lets your users edit content without HTML knowledge - (2010-02-14) [2931] Syncronise - software, trains, and buses. Please! - (2010-08-22) [3454] 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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