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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
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)


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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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