What is the proper name for the variables you pass into a function in PHP?

In that example $bar is a parameter Given your example, in a call of foo(1, 2, 3) the value 1 would be an argument See this question for the distinction. (tl;dr version: parameters are the slots/variables that hold the arguments. ) $option is an optional parameter.

In that example, $bar is a parameter. Given your example, in a call of foo(1, 2, 3); the value 1 would be an argument. See this question for the distinction.(tl;dr version: parameters are the slots/variables that hold the arguments.) $option is an optional parameter.

Thanks! This is exactly what I was looking for. I knew this, or at least learned it long ago and forgot it.

– aslum Jul 20 at 23:09.

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