check if the page exists

I’m using this code to set a variable wich tell the script what file to load:

[code=php]
if(isset($_GET[“page”])) {
$file = $_GET[“page”];
$file=$page.’.txt’;
} else {
$file = ‘error.txt’;
}
[/code]

this is set like this:

[url]www.mydomainname.com/script.php?page=file[/url]

this loads file.txt

I have it working so if there is no variable set in the URL it loads the error.txt but I need to have the script check if the page exists incase there is a spelling error in the URL

e.g.

[url]www.mydomainname.com/script.php?page=fille[/url]

I need the script to then load error.txt

I’ve got this code but i’m unsure how to implement it.

[code=php]
if (file_exists($file)) {

do this
or die(
do this
); }
[/code]

Cheers
Chris

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