Question

How can I refresh the page, changing one parameter of the GET string?

Say I’m on this page:

/my/page?foo=bar&asd=qwe

And in the controller, I have this variable:

$var = array('foo' => 'woof');

How can I use that variable to redirect to this page?:

/my/page?foo=woof&asd=qwe

Or if I’m on this page:

/my/page

Using that variable, how do I get to this page?:

/my/page?foo=woof

Answer 1

If I understand well, what you want to do is the following:

public function myAction()
{
    $request = $this->getRequest();
    $params = $request->query->all();  // get the original GET parameters

    $var = array('foo' => 'woof');
    $newParams = array_replace($params, $var); // only replaces the 'foo' parameter, keeping the rest as is

    $url = '/my/page?'.http_build_query($newParams); // you can also use $this->generateUrl() if you use routing (which would be a good idea)

    return $this->redirect($url);
}