I have the folllowing PHP code on Windows:

 $program = "cvs checkout";
 $array_cvsget = array();
 $cvsretvalue = 0;
 exec($program, $array_cvsget, $cvsretvalue);

after execution $array_cvsget contains,
program = cvs checkout

but from command prompt in Windows, it is supposed to be:
 cvs [checkout aborted]: must specify at least one module or directory

Anybody know why? Or has anybody got something like:
$program = "cvs checkout -P -r branch Common";
to work ??.

Thanks