$tmpfname='tmp/test.jpg';
$r_last_mod=time()-1000;

if (file_exists($tmpfname)) touch($tmpfname,$r_last_mod);

I?ve a filename stored in $tmpfname, while file_exists() finds the file and enters condition, touch() tells me "Warning: utime failed: No such file or directory in d:\class.x.php on line 710"

Hm, I guess nobody has used this function before on windows, perhaps its mechanism to evaluate paths should be updated to use the same file_exists() uses...