Like any other value/variable -- nothing special.
Because you can produce fast and efficient code. Function arguments are passed "by value", and so you can't change the original value of the argument, but if you use pointers, you can.
Because you can produce fast and efficient code. Function arguments are passed "by value", and so you can't change the original value of the argument, but if you use pointers, you can.
Yes.
function name and arguments
No. But avoiding unnecessary duplication of data does.
When defining your function, do not put any arguments in the definition (e.g. function myFuntion()). Inside the function, you can use func_num_args() and func_get_arg($number) to get the function's arguments.
Commas are used to separate arguments in Excel functions.
Pointers are variables that hold the address to a memory location. It makes copying/assignment very efficient, since it eliminates the need for copying entire memory blocks...only the address is copied. This is useful for example for function arguments.
Formal arguments are the named arguments defined by the function. Actual arguments are those arguments that were passed to the function by the caller.
values used with a function are called
It shows you what needs to be put into a function for it to work. You can type the arguments directly into the boxes that are shown for the particular function you are using. It is particularly handy for more complex functions that you are not used to working with.
Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.Optional arguments are ones in a function that you don't have to use. The function will still work without them. It will depend on the function you are using and what you are trying to achieve as to when you use them. Check the help on particular functions that have optional arguments and see what they do. Then experiment with them. They usually give extra information or change how the function works or include extra values. Sometimes you will be able to use them, and other times they are not necessary or a default value is taken.