How to leave a request in the url get on the transition?

Question

PHP

If we are on the page site.ru/page1.php?test=1, then when we go to another page, this get request should be saved - site.ru/page2.php?test=1
Tell me where to dig?

Answer 1

$url = 'http://site.ru/page2.php' . '?' . http_build_query($_GET);

Answer 2

I understand that the url "site.ru/page1.php site.ru/page2.php ..." is the result of pagination, "?test=1" in the url these are parameters, filters or the like.
to display pages, use some kind of cycle in which urls are generated, and concatenate additional. options

// где то в пагинации что то типа:
foreach($pagesArray as $page){
   $page['url'] .= '?' . $getParms;
}

Answer 3

add it to the href of links when generating the page

Answer 4

to save one variable test then
page2.php :
and to save any variables passed to get then

$link="/page2.php?";
foreach($_GET as $key=>$value)
{
$link.="$key=$value&";
}

echo "<a href=\"$link\">page2</a>";