catch

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          catch() - catch an evaluation error

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          mixed catch( mixed expr );

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          Evaluate <expr>. If there is no error, 0 is returned. If
          there is a standard error, a string (with a leading '*')
          will be returned.

          The function throw() can also be used to immediately return
          any value, except 0. catch() is not really a function call,
          but a directive to the compiler.

          The catch() is somewhat costly, and should not be used just
          anywhere.  Rather, use it at places where an error would
          destroy consistency.

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          error(3), throw(3), error_handler(4)

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