Passing outer function parameter to inner function Laravel - laravel-8

Question

I have the code bellow aimed at retrieving all the service providers using the service ID
public function getProvidersByPackage($id = null){
$package_id = $id;
$providers = ServiceProvider::whereHas('services', function($query) {
$query->where('packages.id', 1);
})->get();
dd($providers);
}
I would like to replace the constant 1 with the variable $id passed to the outer function getProvidersByPackage()
my problem is that when I try the following
public function getProvidersByPackage($id = null){
$package_id = $id;
$providers = ServiceProvider::whereHas('services', function($query) {
$query->where('packages.id', $id);
})->get();
dd($providers);
}
I get the error $id is not defined and when I try
public function getProvidersByPackage($id = null){
$package_id = $id;
$providers = ServiceProvider::whereHas('services', function(&$package_id, $query) {
$query->where('package.package_id', $package_id);
})->get();
}
I get the ArgumentCountError bellow
Too few arguments to function
App\Http\Controllers\ShopController::App\Http\Controllers\{closure}(), 1 passed in
/var/www/html/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php on line 1207
and exactly 2 expected
What could I be doing wrong?

Answer 1

In PHP, you can pass a variable to a closure using the use syntax
public function getProvidersByPackage($id = null) {
$package_id = $id;
$providers = ServiceProvider::whereHas('services', function ($query) use ($package_id) {
$query->where('package.package_id', $package_id);
})->get();
}