Hi.  Im looking over someone else's code and I come across something I 
dont understand and dont know where in the manual to look for it.
Here is an example ==>

$string1 = (isset($string2)) ? $HTTP_GET_VARS['pid'] : "";

I have no idea what the '?' in the line and the ':' at the end, so I 
have no way of interpreting what $string1 could be.
If you could point me to the page in the manual that would be great.


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