Xampp not displaying PHP pages in htdocs

You might consider setting up vhosts with Apache so you don't have to copy your files anywhere.

Here is a link to a tutorial for setting up vhosts with xampp.

What system are you using, Win, Mac or Linux? On Mac when I try http://localhost/ it redirects to http://localhost/xampp/ and then there's the default welcome page.

Also, if you put you page(s) in a folder (abc_folder/index.php for example) under htdocs, you'll have to call it http://localhost/abc_folder/index.php

You may have error reporting turned off in your php.ini file, and it could be something like a database error causing your pages to blank.

I would suggest putting this code into test.php and navigating to it.

<?PHP
    phpinfo();
?>

The problem is php start tag. Write it correctly and work. Not <? but <?php at all tags on the page.