ldc-bogt/app/Http/Controllers/Controller.php

<?php

namespace App\Http\Controllers;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Routing\Controller as BaseController;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;

class Controller extends BaseController
{
    use AuthorizesRequests;
    use DispatchesJobs;
    use ValidatesRequests;

    /**
     * Handle search for model.index
     *
     * @param Builder      $query    The eloquent query builder.
     * @param string       $search   The query string.
     * @phpcs:ignore Squiz.Commenting.FunctionComment.ParamCommentFullStop
     * @param string|array ...$field Either a simple array or a string.
     * In case of a string the two fields would be concatenate to make the search
     * @return Builder
     */
    protected function searchQuery(
        Builder $query,
        string $search,
        ...$field
    ): Builder {
        if (count($field)) {
            $table = $query->getModel()->getTable();
            $query = $query->where(function ($q) use ($field, $search, $table) {
                foreach ($field as $f) {
                    $f = str_replace('?', '\?', $f);
                    if (is_array($f)) {
                        $q->orWhereRaw(
                            sprintf("UPPER(CONCAT(%s)) LIKE UPPER(?)", collect($f)->map(function ($q) use ($table) {
                                return "`$table`.`$q`";
                            })->implode(', \' \', ')),
                            ["%$search%"]
                        );
                    } else {
                        $q->orWhereRaw("UPPER(`$table`.`$f`) LIKE UPPER(?)", ["%$search%"]);
                    }
                }
            });
        }
        return $query;
    }
}