Auto redirect to different URLs based on mobile devices, WordPress

wordpress-mobile-auto-redirect.php

// Adds app redirect rules

add_action( 'wp_head', 'download' );

function download() { ?>

      <script type="text/javascript">

      // redirect for iPhone / iPad:
      if (( navigator.userAgent.match( /iPhone|iPad|iPod/i ) )) {
        document.location.href = 'https://iphone.com';
      }

      // redirect to Samsung Galaxy Store:
      if (navigator.userAgent.match( /SAMSUNG|SGH-[I|N|T]|GT-[I|P|N]|SM-[N|P|T|Z|G]|SHV-E|SCH-[I|J|R|S]|SPH-L/i )) {
        document.location.href = 'https://galaxy.com';
      }

      //redirect for Android:
      else if (navigator.userAgent.match( /Android/i )) {
        document.location.href = "https://android.com";
      }

      </script>
	<?php 
}