Can't access variable within class instance

Question

I can't seem to access $module within the Breadcrumbs instance. How can I access it?

$modules = Module::all();

foreach ($modules as $module)
{
    Breadcrumbs::register($module->name, function($b)
    {
        $b->parent('modules');
        $b->push($module->display_name, url('/module/' . $module->name));
    });
}

Answer 1

This is a variable scope issue. To be able to access local variables inside a closure you have to inject them with use(...)

Breadcrumbs::register($module->name, function($b) use ($module)
{
    $b->parent('modules');
    $b->push($module->display_name, url('/module/' . $module->name));
});

This answer provides a very good explanation of the whole topic

Answer 2

$modules = Module::all();

foreach ($modules as $module)
{
    Breadcrumbs::register($module->name, function($b) use ($module)
    {
        $b->parent('modules');
        $b->push($module->display_name, url('/module/' . $module->name));
    });
}

Hence the use keyword.