Question

Ok, I’m looking into using create_function for what I need to do, and I don’t see a way to define default parameter values with it. Is this possible? If so, what would be the best approach for inputting the params into the create_function function in php? Perhaps using addslashes?

Well, for example, I have a function like so:

function testing($param1 = 'blah', $param2 = array())
{
    if($param1 == 'blah')
        return $param1;
    else
    {
        $notblah = '';
        if (count($param2) >= 1)
        {
            foreach($param2 as $param)
                $notblah .= $param;

            return $notblah;
        }
        else
            return 'empty';
    }
}

Ok, so how would I use create_function to do the same thing, adding the parameters and their default values?

The thing is, the parameters are coming from a TEXT file, as well as the function itself.
So, wondering on the best approach for this using create_function and how exactly the string should be parsed.

Thanks 🙂

Answer 1

Considering a function created with create_function this way :

$func = create_function('$who', 'echo "Hello, $who!";');

You can call it like this :

$func('World');

And you’ll get :

Hello, World!

Now, having a default value for a parameter, the code could look like this :

$func = create_function('$who="World"', 'echo "Hello, $who!";');

Note : I only added the default value for the parameter, in the first argument passed to create_function.

And, then, calling the new function :

$func();

I still get :

Hello, World!

i.e. the default value for the parameter has been used.

So, default values for parameters work with create_function just like they do for other functions : you just have to put the default value in the list of parameters.

After that, on how to create the string containing the parameters and their values… A couple of string concatenations, I suppose, without forgetting to escape what should be escaped.