trait laravel in model use treer structure table.php

<?php

trait Tree
{
    protected $nameChildAttribute = 'children';

    public function getTree(\Illuminate\Support\Collection &$tree, $nameMethod) : array
    {
        foreach ($tree as &$parent)
        {
            if ( $parent->child->isEmpty() === false)
            {
                $parent[$this->nameChildAttribute] = $parent->$nameMethod;
                recursive($parent->$nameMethod);
            }
        }
        return $tree->toArray();
    }
}