php json转换为嵌套数组array

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<?php
function json_to_array($web) {
    $arr=array();
    foreach($web as $k=>$v) {
        if(is_object($v)) $arr[$k]=json_to_array($v);  //判断类型是不是object
        else $arr[$k]=$v;
    }
    return $arr;
}
$s='{"webname":"homehf","url":"www.homehf.com","qq":"744348666"}';
//将字符转成JSON
$web=json_decode($s);
$arr=array();
foreach($web as $k=>$v)
    $arr[$k]=$v;
echo "<pre>";
print_r($arr);
echo "</pre>";

$s='{"webname":"homehf","url":"www.homehf.com","contact":{"qq":"744348666","mail":"nieweihf@163.com","xx":"xxxxxxx"}}';
$web=json_decode($s);
$arr=json_to_array($web);
echo "<pre>";
print_r($arr);
echo "</pre>";

/************************************************************************
************************************************************************/
$s='{"webname":"homehf","url":"www.homehf.com","contact":{"qq":"744348666","mail":"nieweihf@163.com","xx":"xxxxxxx"}}';
$web=json_decode($s);
echo '网站名称：'.$web->webname.'<br />网址：'.$web->url.'<br />联系方式：QQ-'.$web->contact->qq.' MAIL:'.$web->contact->mail;
echo '<br /><br />';
/************************************************************************
************************************************************************/
$s='{"webname":"homehf","url":"www.homehf.com","contact":{"qq":"744348666","mail":"nieweihf@163.com","xx":"xxxxxxx"}}';
$web=json_decode($s);
echo json_encode($web);