Description
int 
fileowner ( string filename )
    
     Returns the user ID of the owner of the file, or FALSE in case of
     an error. The user ID is returned in numerical format, use
     posix_getpwuid() to resolve it to a username.
    
Note: The results of this 
function are cached. See clearstatcache() for 
more details.
Tip: As of PHP 5.0.0 this function
can also be used with some URL wrappers.  Refer to 
Appendix M for a listing of which wrappers support 
stat() family of functionality.
     See also stat()