php - Request mixed with JSON strings and array fields, Losing data in custom function for reduction

one text

Solution:

solution script but need make it simpler:

<?php
    function buildVirtualData($data)
    {
    
        if (is_array($data)) {
            $temp = [];
            foreach ($data as $key => $value) {
                $temp[$key] = buildVirtualData($value);
            }
            return reduArray($temp);
        } elseif (valJson($data)) {
            $json_obj = json_decode($data, true);
            foreach ($json_obj as $key1 => $json_sub_obj) {
                foreach ($json_sub_obj as $key2 => $value2) {
                    if (is_array($value2)) {
                        $temp = [];
                        foreach ($value2 as $keyof => $valueof) {
                            $temp[$keyof] = buildVirtualData($valueof);
                        }
                        $json_obj[$key1][$key2] = $temp;
                    } else {
                        if ('true' === $value2 || true === $value2) {
                            $json_obj[$key1][$key2] = true;
                        } elseif ('false' === $value2 || false === $value2) {
                            $json_obj[$key1][$key2] = false;
                        } else {
                            $json_obj[$key1][$key2] = $value2;
                        }
                    }
                }
                return reduArray($json_obj);
            }
        } else {
            if ('true' === $data || true === $data) {
                $data = true;
            } elseif ('false' === $data || false === $data) {
                $data = false;
            }
            return $data;
        }
    }
    
    function valJson($var)
    {
        if (!is_array($var)) {
            return ((json_decode($var) != null) &&
                (is_object(json_decode($var)) || is_array(json_decode($var)))) ? true : false;
        } else {
            return false;
        }
    }
    function reduArray($array)
    {
        $result = $array;
        if (is_array($array)) {
            $check = true;
            foreach ($array as $key => $value) {
                if (!is_array($value)) {
                    $check = false;
                    break;
                }
            }
            if ($check) {
                $result = array_reduce($array, 'array_merge', []);
            }
        }
        return $result;
    }
    
    $_POST=[];
    $_POST['JsonData']='[{"firstname":""},{"lastname":""},{"email":""},{"countryCode":""},{"phone":""},{"i_signup_password":""},{"i_signup_password_rep":""},{"email":""},{"i_signin_password":""},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"},{"form":"d-sys-login"},{"process":"e-signin"}]';
    $_POST['otherdata']='otherdata';
    $_POST=buildVirtualData($_POST);
    $_POST=reduArray($_POST);
    echo var_dump($_POST);