$var1=rr_add
$update->push(update => eval "${var1}('foo.example.com. 86400 A 192.168.1.2'))");

##</code><code>##

no strict 'refs';
$var1=rr_add
$update->push(update => $var1->('foo.example.com. 86400 A 192.168.1.2'))");