What is the variables for unread PM messages?

[NewMaker]

The currect variable on global alert is this one:

{$privatemessage_text}

which i can't change it but i want to know the variable of the number when someone sents a message and the username .

For example the current pm system is :

You have (a-one) unread private message from (b- The username )

I need the a- and the b- variables

does any of you knows them? i would be really happy if you could give them to me.

[MybbCo]

i see this in every theme for number of unread messages :

{$mybb->user['pms_unread']}

[NewMaker]

i see this in every theme for number of unread messages :

{$mybb->user['pms_unread']}

thank you very much this is what i was looking for.