whereLikeMacro.php

 <?php
Builder::macro('whereLike', function ($attributes, string $searchTerm) {
    $this->where(function (Builder $query) use ($attributes, $searchTerm) {
        foreach (Arr::wrap($attributes) as $attribute) {
            $query->when(
                str_contains($attribute, '.'),

                function (Builder $query) use ($attribute, $searchTerm) {
                    $relations = explode('.', $attribute);
                    $is_top_level_relationship = true;

                    $deepSearch = function (Builder $query) use (&$relations, &$deepSearch, &$searchTerm, &$is_top_level_relationship) {
                        if (count($relations) > 1) {

                            if ($is_top_level_relationship) {
                                $is_top_level_relationship = false;
                                $query->orWhereHas(array_shift($relations),  $deepSearch);
                            } else {
                                $query->whereHas(array_shift($relations),  $deepSearch);
                            }

                        } else {

                            $query->where($relations[0], 'LIKE', "%{$searchTerm}%");
                            $is_top_level_relationship = true;

                        }
                    };

                    $deepSearch($query);
                },

                function (Builder $query) use ($attribute, $searchTerm) {
                    $query->orWhere($attribute, 'LIKE', "%{$searchTerm}%");
                }
            );
        }
    });

    return $this;
});

@praisedare - I was wondering, since orWhereHas() supports nested relationships, will it work if we tweak the part where $relationName and $relationAttribute are set in the original article?

Something like this:

$lastDotPosition = strrpos($attribute, '.');
$relationName = substr($attribute, 0, $lastDotPosition);
$relationAttribute = substr($attribute, $lastDotPosition + 1);