Question

When I try to do this:

function a()
{
    function b() { }
}

a();
a();

I get Cannot redeclare b....
When I tried to do this:

function a()
{
    if(!isset(b))
        function b() { }
}

a();
a();

I get unexpected ), expected ....
How can I declare the function as local and to be forgotten of when a returns? I need the function to pass it to array_filter.

Answer 1

You could use an anonymous function in your array_filter call.