php; remove single variable value pair from querystring

Question

I have a page that lists out items according to numerous parameters ie variables with values.

listitems.php?color=green&size=small&cat=pants&pa         


        

Answer 1

It wouldn't work if edit=1 is the first variable:

listitems.php?edit=1&color=green&...

You can use the $_GET variable to create the query string yourself. Something like:

$qs = '';
foreach ($_GET as $key => $value){
    if ($key  == 'pagenum'){
        // Replace page number
        $qs .= $key  . '=' . $new_page_num . '&';
    }elseif ($key  != 'edit'){
        // Keep all key/values, except 'edit'
        $qs .= $key  . '=' . urlencode($value) . '&';
    }
}