Help updating variable in url

Matt_Parsons

I am trying to figure out a way of updating a variable in a url string.
Say for example i have page.php?action=search&limit=10&n=7

Say i then have a new value for limit. Can i update limit without disrupting the order of the url.
i.e.
page.php?action=search&limit=10&n=7

becomes

page.php?action=search&limit=25&n=7

If i use php_self and add the variable to the url, i get it listed twice and it does not work.

I could do this:
break the url into three sections.
1: the page name
2: variable i want to change,
3: and the rest of the url,
so i get

$page=page.php;
$var1=everything from page.php up to my variable limit, and then $var2=everythin from limit to the end of the url.

I cant get started on this and its frustrating. I know i need some sort of regular expression, or string replace, but i cant get my head round it.

It would be nice just to have string replace the limit=10 or whatever with limit=(my new value).

Sorry for the long post.

marque

I guess your using GET as the method to send the data,

You might like to note when using GET as the method the query string is build from the first input tag to the last.

<form name="form1" id="form1" method="get" action="<?php echo $PHP_SELF; ?>">

to keep the "tidyness" of a uri you should put the input buttons, select boxes or fields in the order that you want it to come out on the uri.

cruz610

I would use the form method of POSTING to itself. In your PHP file, add this:

if(isset($_REQUEST['action'])) $action=$_REQUEST['action'];

then, you can add a whole bunch of different variables and then execute them via:

if($action == "getnext") {
variable stuff goes here
}

So your action could be something like getnext or getprevious, where they each have their own queries that arent executed unless called by the page.

Matt_Parsons

The variables in the url are not necessarily ones that are posted from a form.

I have a form that people can do searches by, when the results are listed, i then check to see if the number of results is greater than the limit i set for the page. If it is i setup my pagination, and it works fine.

The problem starts here.
As people traverse the website, the links they click determine what the see, so a link might be page.php?action=search, or page.php?action=viewregion.

Now if i am not careful, the variables set in the url could be lost, unless i use php_self and _SERVER[QUERY_STRING'] to find out whats already in the url.

My problem comes, when a variable is already set, and i want to give it a new value.

Thanks for the help so far though.