file_exists problem

I wrote a little script to check if an image exists using file_exists but it didn’t work, I also tried another “is_file” I think, neither worked. I found the below and used it but I’m getting errors obviously when the file doesn’t exist, although from the user end it works well:

[code=php]
$cached = “/”.$cache.”.jpg”;
$AgetHeaders = @get_headers($cached);
if (preg_match(“|200|”, $AgetHeaders)) {
$bimage=$cached;
} else {
$bimage=”thumb.php?img=”.$value.”.jpg”;
}
[/code]

the first one I tried is below, but it kept returning the file name does not exist although i could type it into the browser and see the image. any ideas? does it not work with images?

[code=php]<?php
$filename = ‘/path/to/foo.txt’;

if (file_exists($filename)) {
echo “The file $filename exists”;
} else {
echo “The file $filename does not exist”;
}
?>
[/code]

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