Did I find a htpasswd bug?

["James M" <jlmjlist@xxxxxxxxx>]

While trying to delete a user via a php program I notice that the return code is zero when a user is not found. Shouldn't it be non zero. Or maybe I'm doing something wrong.
Here's the code and also what I see in the error_log...
 
system("/usr/local/apache2/bin/htpasswd -D /usr/local/apache2/conf/vins
ight.passwd $username",$retval);
 
As I said the return value is zero when I see the following in the error_log...
 
User jimbo55 not found
 
Am I going about this wrong or is this a bug?
 
Thanks for the help.
BTW apache 2.3.3
 
James