Description:
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I used the script below to generate a filename, and check if it already exists useing file_exists (block 1). It generates the following output: "File 'C:\Program Files\Apache Group\Apache2\htdocs\aanleverwizard/temppics/e88d28551c277889a0b34b4b2135d348/pic0.png' does not exist!". However, when I copy/paste this to the windows run dialog, it actually is executed, so the file does exist!

I also tried replacing the file_exists function with a replacement function (block 2), but that also doesn't work...

Reproduce code:
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//BLOCK 1: REPRODUCE FILE_EXISTS BUG
$Teller = 0;
$TestFile = getcwd(). '/temppics/'. session_id(). '/pic'. $Teller. '.png';
if (file_exists($TestFile)){
    echo('File \''. $TestFile. '\' exists!<BR>');
} else {
    echo('File \''. $TestFile. '\' does not exist!<BR>');
}
// BLOCK2: ALTERNATIVE TO FILE_EXISTS FUNCTION
	if (!function_exists('file_does_exist')){
		function file_does_exist($FileName){
			if (glob($FileName)){
				return true;
			} else return false;
		}
	}

Expected result:
----------------
I expect file_exists to return true, but it does not. I did verify that the file does actually exist.

Actual result:
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// see description.