How to remove query string from current page URL?

You don’t need $url = "https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']; for getting the current URL to remove the query string.

All you need is remove_query_arg('the_query', false). False, means it will use the current URL and your code can be shorten to:

function abc_redirections(){
    if(isset($_GET['query_string']) || isset($_GET['query_string_1'])){
        $array = array();
        if(isset($_GET['query_string']) && (empty($_GET['query_string']) || !is_numeric($_GET['query_string']) || (is_numeric($_GET['query_string']) && $_GET['query_string'] < 1))){
            $array[] = "query_string";
        }
        
        if(isset($_GET['query_string_1']) && (empty($_GET['query_string_1']) || !is_numeric($_GET['query_string_1']) || (is_numeric($_GET['query_string_1']) && $_GET['query_string_1'] < 1))){
            $array[] = "query_string_1";
        }

        wp_redirect(remove_query_arg($array, false));
    }
}

Also, you are right. The page will become slow with the current approach since it will load twice.

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