login with facebook open in Android facebook Application in PHP?

I was implement login with Facebook in PHP It's perfect Works But i want if website open in mobile browser then redirect in Mobile Facebook Application if Not then mobile browser. How can Do ?

here some code

require_once __DIR__ . '/Facebook/autoload.php'; // download official fb sdk for php @ https://github.com/facebook/php-graph-sdk

$fb = new Facebook\Facebook([

  'app_id' => '*****************',

  'app_secret' => '*******************',

  'default_graph_version' => '***',

  ]);

$helper = $fb->getRedirectLoginHelper();

$loginUrl = $helper2->getLoginUrl('URL', $permissions);

//here login with facebook button

<a href="<?php echo $loginUrl ?>" class="fbblue">Log in with Facebook!</a>

Copy code

This code redirect only facebook in browser.

Help me .

Thnakyou

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