An if statement for a warning?

Anon

Hey,
I have a script that includes a file, the name depending on a variable in the URL. Example:

Note: For this example, pretend the script is called by this URL:
http://www.mywebsite.com/includer.php?page=main

And here's the script:

if ($page) {
include("http://www.mywebsite.com/include/"."$page".".inc");
} else {
echo "A page name was not supplied.";
}

Now, assuming that the page exists, the script works and the page is included. However, if a page supplied does not exist, a warning is displayed in its place. I would like to know if there's a way to have some sort of statement like:

if (thepagedoesnotexist) {
echo "The supplied page does not exist.";
}

Of course, it won't work as typed, but I'm hoping someone knows a way to get this kind of effect. Thanks!

kparker

This is your own site? You shouldn't get include pages from the webserver but directly from the filesystem. And yes, it's possible to do what you want, using the curiously-named function file_exist():

if ( ! isset($page))
   echo "A page name was not supplied.";
elseif (! file_exists( '/include' . $page . '.inc' ))
   echo 'The supplied page does not exist.';
else
   include( '/include/' . $page . 'inc' );

Anon

Thanks! I had found the file_exists() statement in the docs shortly after posting... but it definitely helps to see it in context!