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What is a Query String?

A query string is the part of the URL that contains the data that is going to  passed to via HTTP (GET).  The query String typically is denoted by ( ? ) symbol.

See link below with query string:

www.someaddress.com?token=12&others=20&key=22

Removing QS:

Most of the time while working with URLs in PHP is spent extracting values from the query string. But what if you want to delete a key from the URL? In this post we are going to see how it can be accomplished.

Example 1:

Using  $_GET array:

function remove_url_key($key){
 // Set query url query string
 $base_uri = $_SERVER['QUERY_STRING'];    

 $_new_uri = array();
 // Verify if the key is set
  if(!isset($_GET[$key]))
  {
         $q_string = $base_uri;
  }
  else
  {
     // Look for all values stored in $_GET array
     foreach($_GET as $uri=>$val)
     {
       // If array values EQ to $key
        if ($uri != $key)
        {
           // Assign values to new array
            $_new_uri[$uri] = $val;
        }
     }
  }
//build array to query string
 $q_string = http_build_query($_new_uri);
// Return final url
return  $q_string;
}

Example 2

Using  parse_str()

function remove_url_key($key){

  $base_uri = $_SERVER['QUERY_STRING'];    
  $q_string = "";
  // Verify if the key is set
  if(!isset($_GET[$key]))
  {
     $q_string = $base_uri;
  }

  else
  {
    // Parse $base_uri into $new_qs array
    parse_str($base_uri, $new_qs);
    // Delete $key with value EQ token
    unset($new_qs[$key]);
    //Build new query String
    $q_string = http_build_query($new_qs);
  }

// Return final url
return  $q_string;
}

Helpful links:

parse_str -  http://php.net/manual/en/function.parse-str.php

http_build_query -  http://php.net/manual/en/function.http-build-query.php

$_SERVER- http://php.net/manual/en/reserved.variables.server.php