Question

I am trying to do a canonical redirect from this url

http://www.mysite.com/page.php?id=1&title=aaa

To this: http://www.mysite.com/1_aaa

I wrote this function:

function canonicalRedirect($url)
{

    if (strtoupper($_SERVER['REQUEST_METHOD']) == 'GET')
    {
        $canonical = $url;
        if (!preg_match('/'.str_replace('/','\/',$canonical).'/', $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']))
        {
            header('HTTP/1.0 301 Moved');
            header('Cache-Control: no-cache');
            header("Location: $canonical");
        }
    }
}

And in the page.php I put this code:

canonicalRedirect($url);

Retrieving the $url variable from a MySQL query. However when I try to run it I get this error (I am using Firefox): The page isn’t redirecting properly

I am thinking that the page is self-redirecting but how can I solve this problem? Thanks

Answer 1

finally I managed to solve my problem. I rewrited my function like this:

function canonicalRedirect($url)
{
            //Check that there is not query string in the url
    if(preg_match('/\?/', $_SERVER["REQUEST_URI"])) {
        header('HTTP/1.0 301 Moved');
        header('Cache-Control: no-cache');
        header("Location: $url");
    }   
}

Then in the page.php code I wrote this:

 // code to retrieve the canonical url from MySQL
 // $row is the array with the url data and $canonicalurl is obviously the canonical url


if($_GET['title'] != $row['url_title']) {

  header("HTTP/1.1 301 Moved");
  header('Status: 301 Moved Permanently', true);
  header("Location: ".$canonicalurl."",TRUE,301);
}
else {
}

canonicalRedirect($canonicalurl);

Bye!