I'm using the superglobal $_POST array to access URL 
parameters passed to my page. I was getting undefined 
constant errors in my error_log file, and found that I 
needed to quote the variables in the array. 
  $_POST['SortBy'] etc. Now, it appears that I've just 
traded the undefined constant errors for undefined index 
warnings. Everytime a page hits a page with url 
parameters, it triggers a warning in the error_log file. 
What's triggering these undefined index errors? I suppose 
I could lower the logging level in php.ini, but I'd rather 
code properly than to hide the problem. Thanks!

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