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index.php doesn't define $pageTitle
I followed along and contact and shirts both displayed title correctly, but index.php will not. I cut my php $pageTitle and header include from contact.php (so index.php should also say "Contact Mike"), but, after saving, I get the title as
<br /> <b>Notice</b>:Undefined variable: pageTitle in <b> C:\xampp\htdocs\inc\header.php</b> on line <b> 3 </b> <br/>
Why doesn't index.php define $pageTitle?
Can you include the markup for index.php?
Is your $pageTitle variable defined on the index.php page? It appears that it isn't since you are getting that error. If you share your code we can take a better look at the issue and help you address it, but make sure that at the top of your index.php file you have defined the $pageTitle variable.