From PHP manual:

array array_change_key_case ( array $array [, int $case = CASE_LOWER ] )

What does comma signify in a function definition?


1 Answer 1


Comma is a separator between parameters in the parameter list.

Comma is part of the parameter lists. Optional parameters are usually specified inside square brackets in documentation like so: [, int $case = CASE_LOWER]. Comma is added to specify that if you were to use the second optional parameter, you must have a comma separator as well.

The fact that comma is inside square brackets, means it's only required when you have more than one parameter.  

Another example with more optional parameters:

array array_change_key_case ( array $array [, int $case = CASE_LOWER [, string $myValue = '' ]] )

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