Those parameters are optional, as the codex states:
$post_type
(string) (optional) Post type to count the number of posts for. Default: "post"
So it’s optional, not required. If it isn’t passed in, then the default value is "post".
Optional parameters are a part of PHP, e.g.
function print_number( $number=5 ) {
echo $number;
}
print_number( 2 ); // prints 2
print_number(); // prints 5
Note that this doesn’t mean all parameters are optional. Check the parameter in the docs for the function you’re using to see if it’s optional, and what its default is
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