[TxMt] question for language completion or php bundle maintainers: behavior deleting a snippet element

The completion for languages is very helpful, so: ex<option-esc> --> explode(string separator, string str, [int limit])

Currently backspacing on a snippet component like "[int limit]" leaves a broken fn call (unwanted trailing comma), i.e:

explode(string separator, string str,)

Is it possible to alter the generated snippets so that when the user backspaces on a snippet element in function calls like this, the comma preceding the unwanted parameter is also eaten, i.e.?

explode(separator, str${1:, ${2:[int limit]}}) instead of explode(separator, str, ${2:[int limit]}})