Open pdf file in new window from one of two folders with php

I have two folders, one with pdf files starting with P in the Place folder, and the other with files starting with C in the Country folder.

If I use a link like
<a target='_blank' href='http//myhost.com/sort.php?trip=$row[trip_number]'>" . $row['trip_number'] . "</a>  

And than in the sort.php script use this
$trip = (isset($_GET["trip"])) ? $_GET["trip"] : 0;

What can I use to take the $_GET["trip"] and redirect the request to the right folder and open the file in the parent window. I was thinking that the if statement might work like

if $trip = p*.pdf than redirect to place/$trip, if not redirect to country/$trip and if it cant find the file echo not on file and not the 404

but as you see I have no idea how to write it. Also any other way of doing this is fine if you have one. This is all I could come up with....  Thanks
GD_GRAYAsked:
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ahoffmannCommented:
$dir="country/";
if(preg_match('/^p/i',$trip)){$dir="place/";}
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GD_GRAYAuthor Commented:
Sorry to ask but how would I put that into play ?
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ahoffmannCommented:
in the php script which is called by the links
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GD_GRAYAuthor Commented:
Wow, your the bomb. thank you . I set the redirect up to use $dir/$trip and got what i need,
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