I have a Facebook link string:

```
"https://www.facebook.com/v2.5/dialog/oauth?client_id=*****&state=*****&response_type=code&sdk=php-sdk-5.1.2&redirect_uri=http%3A%2F%2Flocalhost%3A8888%2Ffacebook%2Flink&scope=email%2Cuser_birthday%2Cuser_photos"

```

I want to replace: 

`redirect_uri=http%3A%2F%2Flocalhost%3A8888`

to 

`redirect_uri=http%3A%2F%2Flocalhost`

---

I would do something like this if it's the browser URL, but it is a string inside a anchor tag.

```
if (isset($_GET['redirect_uri'])) {
    echo $_GET['redirect_uri'];
}else{
    // Fallback behaviour goes here
}

```

How do I do something like that?

---

I've tried

```
$permissions = 'user_birthday,user_photos';
$login_url = $fb->getLoginUrl(['email','scope'=>$permissions]);
$urls = explode("&", $login_url);
$redirect_uri = explode("=", $urls[4]);
$link = explode("%2F", $redirect_uri[1]);

dd($link);

// array:5 [▼
//   0 => "http%3A"
//   1 => ""
//   2 => "localhost%3A8888" // I want to replace this string with 'localhost'
//   3 => "facebook"
//   4 => "link"
// ]

```