Laravel Cache, variable inside closure undefined?

Question

I have a function like this:

public function entity($entity_id, Request $request)
{
    $expiresAt = Carbon::now()->addMinutes(10);
    $entity = Cache::remember('entities', $expiresAt, function () {
        return Entity::where('id', $entity_id)
            ->with('address')
            ->with('_geoloc')
            ->first();
    });

However this returns an error saying, $entity_id is undefined, however when I do dd($entity_id) after $expiresAt, it is defined as I get the id back, id comes from url if that is needed.

Dean Gite · Accepted Answer · 2017-10-24 13:49:51Z

5

You should allow anonymous function to capture the variable outside the scope. $entity_id its outside the scope. This is how php express the closure. With a use() would work.

public function entity($entity_id, Request $request)
{
$expiresAt = Carbon::now()->addMinutes(10);
$entity = Cache::remember('entities', $expiresAt, function () use($entity_id) {
    return Entity::where('id', $entity_id)
        ->with('address')
        ->with('_geoloc')
        ->first();
});

answered Oct 24, 2017 at 13:49

Dean Gite

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2 Comments

Przemyslaw Wojtas Over a year ago

Thanks, will accept this once I can, +1 for explaining in a bit more details

Dean Gite Over a year ago

Thank you :) I appreciate it

Maraboc · Accepted Answer · 2017-10-24 13:56:44Z

2

You have to add use($entity_id) because that variable is outside the scope of the annonymous function it needs to be passed in using the use keyword as shown in the example below :

public function entity($entity_id, Request $request)
{
    $expiresAt = Carbon::now()->addMinutes(10);
    $entity = Cache::remember('entities', $expiresAt, function ()use($entity_id) {
        return Entity::where('id', $entity_id)
            ->with('address')
            ->with('_geoloc')
            ->first();
    });

edited Oct 24, 2017 at 13:56

answered Oct 24, 2017 at 13:47

Maraboc

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