php - Replace Value of Variable in Query -

currently have page1.php being entered url bar variable status , string in url http://example.com/page1.php?status=red. when user clicks enter, redirects page2.php , generates more variables , adds &status= @ end of url http://example.com/page2.php?status=red&varone=1&vartwo=2&status=green

instead of having 2 status variables in url, remove 1st 1 left &status=green @ end.

here code have header redirect:

$query = $_server["query_string"]; header("location: page2.php" . $query . "&status=" . $currentstatus); 

i rather remove first ?status= if possible, since want &status= @ end of url

if want remove first occurrence of status query string better remove previous url.