better way to replace query string value in a given url

Question

Okay.. so basically, say we have a link:

$url = \"http://www.site.com/index.php?sub=Mawson&state=QLD&cat=4&page=2&sort=z\";

Answer 1

I don't know if this is what you're trying to accomplish but here it goes anyway:

($assign)
$res
";
    }

    //example
    $url1 = "http://example.com";
    $url2 = "http://example.com?sort=a";
    $url3 = "http://example.com?sort=a&page=0";
    $url4 = "http://example.com?sort=a&page=0&more=no";

    echo mergeMe($url1,"page=4");
    echo mergeMe($url2,"page=4");
    echo mergeMe($url3,"page=4");
    echo mergeMe($url4,"page=4");
?>