php ternary operator

A little stuck I have the following

echo isset($_开发者_C百科GET['start_date']) ? $_GET['start_date'] : date('d/m/o');

and my IDE is reporting an error I can't see it but if you can you will have my eternal gratitude.

I know I should not be echoing this straight out but in the short term I want to get this up and running so an echo will suffice for now, eventually to be replaced by a variable.

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Update your IDE.
Or use a better IDE.

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Add another () around your isset (basically around your 'if' )