php获取GET方式传入的全部变量名称与值:foreach用法

$count = count($_GET);
$i = 0;
foreach ($_GET as $key => $value)
{
    if ($i == $count - 1)
    {
        $str .= $key . "=" . $value;
    }
    else
    {
        $str .= $key . "=" . $value . "&";
    }
    $i ++;
}  

echo $str;