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Official ZPE Programming Environment documentationOptional parameters

Any parameter can be optional, the only thing that must be done after that is to determine whether it has been set or not. The is_set predefined function is very useful for this purpose.

In some senses, optional paramters was a side effect of the main development of ZPE. It is useful and remains as an option in all versions.

function test($arg1, $arg2, $arg3)
  if(is_set($arg3) && is_set($arg3))
  end if
end function

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