optional argument in function

[imnsi]

I have atleast 20 pages that call on a specific function, and now i need to add another argument to that function, can I make it optional?

[LordShryku]

Sure, you can modify the function with a default value.

function blah($message='blah') {
   return $message;
}

echo blah(); // says "blah"
echo blah('foo'); // says "foo"

[Vann]

Yes. If you specify a default value in the function definition PHP treats it as an optional variable. For example, in this code

function foobar($name, $age, $location = '') { ... }

PHP will throw an error if you don't pass the function with at least two arguments. The third argument is optional, and if it is not specificed, e.g., you call foo('Jim', 25);, it will have a value of '' within the function.

[imnsi]

Ahh... so wise, thanks for the explanation, i saw that code but I assumed it was only for setting a default setting. You are both awesome.