无法向链接添加更多$ _GET变量

Question

Good afternoon,

I'm just trying to add one more variable to my link. For example: I am on page /article?id=12 and I want to switch it to another language. I have two links in the menu. CS and EN. But they are set to "?lang=cs" and "?lang=en". So when I click to switch the language, it will take me to the page /article?lang=en , but I won't have there its ID anymore. Is there any way to keep that $_GET variable and just add one? I though I could give there "&lang=en", but when I am for example on page /contact , it won't work for me like "/contact&lang=en"...

Thank you for all advices!

EDIT

I've tried this, but it doesn't work:

if (strpos($_SERVER['REQUEST_URI'], '?') != false)
{
  $url = $_SERVER['REQUEST_URI'] . '&lang=cs';
   $url2 = $_SERVER['REQUEST_URI'] . '&lang=en';
}
else
{
  $url = $_SERVER['REQUEST_URI'] . '?lang=cs';
    $url2 = $_SERVER['REQUEST_URI'] . '?lang=en';
}

Answer 1

Try this:

$url = "?" . http_build_query($_GET) . (count($_GET) > 0 ? "&" : "") . "lang=en";

This takes the original arguments.