troubleshooting Question

In this code what does the "?" and ":" mean / called?

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vrmetroFlag for United States of America asked on
3 Comments2 Solutions285 ViewsLast Modified:

Trying to figure out what the "?" and ":" mean in the code below.  I know what they do or what this string below does, but not those specific symbols; and are there other variations of these short cuts available?

Thank you
isset($_SESSION[$flds]) ? $_SESSION[$flds] : '' ;
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