Redirect with PHP and skip specific parameter

Since I’ve started using friendly URLS in my website, I’m redirecting every page to the new version, only if the registered user has a “username” in his profile.

So, I’m redirecting from:

https://tribbr.me/post.php?id=850

with:

header("Location:/".$if_username."/post/".$post_id."?".$_SERVER['QUERY_STRING']); exit();

To keep all GET parameters…. but the problem is that this header request, obviously with $_SERVER['QUERY_STRING'] is adding the post id too to the URL, and when redirected, this is the final URL:

https://tribbr.me/TribeMasters/post/850?id=850

Is it possible to just skip the id=850 parameter to the URL redirection? Since it is a duplicated parameter: post/850 and id=850 are the same.

Thanks for helping me 🙂

Anwser 1

@DE_‘s answer is best. But If you are not familiar with Regex, This is an alternative way.

function removeGetParam($param){

 $params = $_GET;

 // removing the key
 unset($params[$param]); 

 // joining and returning the rest
 return implode(',', array_map(function ($value, $key) { 
            return $key.'='.$value;
          },$params, array_keys($params))
        );
}

$filtered_params = removeGetParam('id');
header("Location:/".$if_username."/post/".$post_id."?".$filtered_params);

• Yes! Sometimes the post URL is https://tribbr.me/post.php?id=850&ref=51&fname=Guillermo&more..... So I need to redirect to: https://tribbr.me/username/post/850?ref=51&fnameGuillermo&more... – Guillermo Esquivel Obregon
• Just remove ."?".$_SERVER['QUERY_STRING']? There’s no reason to pass that in if you don’t want it. Or do you have other query parameters you want to pass?

Answer 2

David Walsh did a good article on this redirect to another page in php with parameters

PHP Function: Remove a Query String Key=>Value

function remove_querystring_var($url, $key) { 
    $url = preg_replace('/(.*)(?|&)' . $key . '=[^&]+?(&)(.*)/i', '$1$2$4', $url . '&'); 
    $url = substr($url, 0, -1); 
    return $url; 
}

those are a group of characters captured in the brackets () according to their respective positions of php redirect with parameters

For me, worked better with @BadPiggie answer since I can’t figure out how do I specify id parameter in this function

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