TreeFilter.php

<?php  namespace Bigsinoos\Helpers;

class TreeFilter {
    /**
     * Get only some variables of a tow-level nested array
     *
     * @param $filterable
     * @param array $keep
     * @return array
     */
    public static function doFilter(&$filterable, $keep = ['phone_number', 'leads'])
    {
        $keepable = [];
        foreach($filterable as $key => $value){
            foreach($keep as $what){
                if(isset($value[$what])){
                    $keepable[$key][$what] = $value[$what];
                }
            }
        }
        $filterable = null;
        return $keepable;
    }
}