Description:
------------
Please include examples on how to define (and call) functions with a variable number of arguments:

Example 17.11. Define a function with variable number of arguments:
function test() {
 echo func_get_arg(0);
}
test('hello'); // prints 'hello'

Example 17.12. Other method to define a function with optional second argument
function test($foo, $bar=null) {
 echo $bar;
}
test('one','two'); // prints 'two'
test('one'); // prints nothing

Example 17.13. Wrong way to define a function with optional second argument
function test($foo, $bar) {
 ...
}
test('one'); // gives warning, that argument 2 is missing for test()


Why am I asking for this?
Because the current explanation "No special syntax is required" is not very descriptive. So my first guess was the wrong way shown in Example 17.13