如何删除缓存中的密钥？ （laravel 5.3）

Question

If I run:

echo '<pre>';print_r(Cache('test'));echo '</pre>';die();

the result is like this :

Array
(
    [0] => Array
        (
            [id] => 42
            [name] => real madrid
            [description] => ronaldo
        )

    [1] => Array
        (
            [id] => 41
            [name] => chelsea
            [description] => hazard
        )

)

I want to remove the key that has the id = 42.

I try like this :

$id = 42;
foreach (Cache('test') as $key => $value) {
      if($key['id'] == $id) {
           Cache::forget($key);
      }
}

Then, I run:

dd(Cache('test'));

But the key with id = 42 is still there.

Answer 1

The entry in cache is called test , and it is an array with multiple elements; so trying to delete an entry from cache with the id value 42 won't work because entry 42 isn't the cache entry, just a part of the array.

$ttl = 240;

$id = 42;
// retrieve the array from Cache
$value = Cache::get('test');
// Identify the entry with id of 42
$entry = array_flip(array_column($value, 'id'));
// delete that entry from the array
unset($value[$entry[$id]]);
// restore the modified array to cache
Cache::put('test', $value, $ttl)