get the last 3 characters in a string

How do you get the last 3 characters of a string?

I have usernames set up with a 3-character “code” at the end for the type of user… for example, agents are “agt” so their usernames all end in agt

How do I use PHP to catch these letters so that the type can be set while they’re logged in?

I need to set

[CODE]$_SESSION[‘type’][/CODE]

with this 3-character code so that certain pages permissions will be different based on the type of user.

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