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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 07:56:17) Associated topics are indexed under H310 - PHP - Putting it all together[2635] A PHP example that lets your users edit content without HTML knowledge - (2010-02-14) [1962] Index Card System for Game Characters in PHP - (2008-12-27) [1840] Validating Credit Card Numbers - (2008-10-14) [1794] Refactoring - a PHP demo becomes a production page - (2008-09-12) [1754] Upgrade from PHP 4 to PHP 5 - the TRY issue - (2008-08-15) [1716] Larger applications in PHP - (2008-07-22) [687] Presentation, Business and Persistence layers in Perl and PHP - (2006-04-17) [468] Stand alone PHP programs - (2005-10-18)
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