出现放大器; 在网址中。 我该如何删除？

Question

http://localhost/rootfolder/contact.php?msg=empty&success=empty

What is that amp;? When I click two times on the button, that occurs. What do I have to do different?

Currently, I am creating a website where you can subscribe to a newsletter and you can send a message directly on the website. To return to the previous page, I use a session and also the $_SERVER superglobal. To keep the parameters in the url and also to change them, I wrote a function:

function changeurl($page, $searched, $replacement) {
    $strfinalone = "";
    $strfinaltwo = "";
    if(!(count(explode("?", $page))<= 1)) {
      $a = explode("?", $page);
      if(strlen($a[1]) == 0) {
        $strfinaltwo = $a[0]."?".$searched."=".$replacement;
        return $strfinaltwo;
      }
      if(!(count(explode("&", $a[1])) <= 1)) {
        $b = explode("&", $a[1]);
        for ($i=0; $i < count($b) ; $i++) {
          $e = explode("=", $b[$i]);
          if(strstr($e[0], $searched) !== false) {
            if($e[1] == $replacement) {
              return $a[0]."?".$a[1];
            }
            $str = $e[0];
            $e[1] = $replacement;
            $strfinalone = join("=", $e);
            $b[$i] = $strfinalone;
            $a[1] = join("&", $b);
            $strfinaltwo = join("?", $a);
            return $strfinaltwo;
          }
        }
        $strfinaltwo = $page."&".$searched."=".$replacement;
        return $strfinaltwo;
      } else {
        $d = explode("=", $a[1]);
        if($d[0] == $searched) {
          if($d[1] == $replacement) {
            return $a[0]."?".$a[1];
          }
          $strfinaltwo = $a[0]."?".$searched."=".$replacement;
          return $strfinaltwo;
        } else {
          $strfinaltwo = $a[0]."?".$a[1]."&".$searched."=".$replacement;
          return $strfinaltwo;
        }
      }
    } else {
      $strfinaltwo = $page."?".$searched."=".$replacement;
      return $strfinaltwo;
    }
  }

 // TO GET THE URL:

$link = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? "https" : "http").":"."//{$_SERVER['HTTP_HOST']}{$_SERVER['REQUEST_URI']}";
        $escaped_url = htmlspecialchars($link, ENT_QUOTES, 'UTF-8');

I just want to remove this amp; of the url when I click for example two times the subscribe button and there was nothing filled in.

Answer 1

This is because of htmlspecialchars() which is used to some html characters.

And to encode url you can use urlencode() function.