posix_geteuid
    (PHP 3>= 3.0.10, PHP 4 , PHP 5)
posix_geteuid -- 
     Return the effective user ID of the current process
    
Description
int 
posix_geteuid ( void )
     Return the numeric effective user ID of the current process. See
     also posix_getpwuid() for information on how
     to convert this into a useable username.