how can i use mysqldump with password protected ZIP file ( in LINUX SSH)?

Question

normally i use this command line:

$cmd = 'mysqldump -u ' . $db_user . ' -h ' . $db_server . ' --password=' . $db_pass . ' ' . ($db_name == '' ? '--all-databases' : $db_name) . ' | zip  > ' . $backup_filename;

but i need password protected zip file ;

thanks.