how to build hyperlink for query string in php -

i have question, how can add variable in current url

 book.php?action=addressbook 

i want add

 book.php?action=addressbook&page=2 

how generate hyperlink this, have tried using $_server['php_self'] query string not included in url showing that

book.php?page=2 

i want append other variables query string

please

you can use http_build_query(); append more params url

$params = $_get; $params["item"] = 45; $new_query_string = http_build_query($params); 

for instance:

$data = array('page'=> 34,               'item' => 45);  echo http_build_query($data); //page=34&item=45 or include amp  echo http_build_query($data, '', '&');  //page=34&&item=45