Simple JSON to CSV conversion

csv.php

<?php
//        echo $_SERVER['QUERY_STRING'];
        $json = file_get_contents('http://api.fap.pl/dealers?'.$_SERVER['QUERY_STRING']);

        $_json = json_decode($json, TRUE);

        $out = '';
        foreach($_json as $row)
        {
                $out .= substr(row($row)."\n", 1);
        }
                
        header("Content-Description: File Transfer");
        header("Content-Type: text/csv; charset=windows-1250");
        header('Content-Disposition: attachment; filename="out.csv"');
        header('Content-Transfer-Encoding: binary');
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        header('Content-Length: '.mb_strlen($out));

        echo iconv('UTF-8', 'Windows-1250//TRANSLIT', $out);

function row($row)
{
        $ret = '';
        foreach ($row as $v)
        {
                if (is_array($v))
                {
                        $ret .= row($v);
                }
                else
                {
                        $ret .= ';"'.str_replace('"', '""', $v).'"';
                }
        }
        return $ret;
}