I'm new to php and mySQL, so I'm sure the problem is mine, but when I load the index.php page I receive two error messages:
Notice: Undefined index: photoID in c:\program files\easyphp1-8\www\picturegallery\index.php on line 4

Notice: Undefined index: albumID in c:\program files\easyphp1-8\www\picturegallery\index.php on line 6

Once I select a thumbnail the page updates correctly, but the first error recurs if I select the second album in the database.

I've checked that the code matches the sample code at the end. I've also tried updating the page code to set a value for photoID and albumID at the beginning, but I have not been successful.

I installed a new apache 2 server, reinstalled and reconfigured php and installed a new version of mySQL. I then totally rebuilt the database, which appears to have resolved the problem. The error no longer appears when I test.