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Possible Duplicate:
What are the PHP operators “?” and “:” called and what do they do?
Reference – What does this symbol mean in PHP?
I know what isset means in PHP. But I have seen syntax like isset($x) ? $y : $z. What does it mean?
That is a Ternary Operator, also called the “conditional expression operator” (thanks Oli Charlesworth). Your code reads like: