Sometimes, instead of type-checking values, we can instantly cast them to types we want. We can save some lines of code by being a bit more clever.
// Instead of this
$value = is_array($value) ? $value : [$value];
array_map(function ($item) {
//
}, $value);
// You can do this
array_map(function ($item) {
//
}, (array) $value);