iOS / Android Detection by User Agent

platformDetection.php

<?php
    $platform = call_user_func(function() {
        $token = $_SERVER['HTTP_USER_AGENT'];
        
        if (isset($_GET['platform']) === true) {
            $platform = $_GET['platform'];
            
            return in_array($platform, array('iOS', 'Android', 'Other')) === true ?
                $platform :
                'Other';
        }
        
        $pos = strrpos($token, 'Puffin/');

        if ($pos !== false) {
            $token = substr($token, $pos + 7);
            $len = strlen($token);

            for ($i = 0; $i < $len; ++$i) {
                switch ($token[$i]) {
                    case 'I':
                        return 'iOS';
                    case 'A':
                        return 'Android';
                    case ' ':
                        return 'Other';
                }
            }

            return 'Other';
        }

        if (strpos($token, 'iPad') !== false ||
            strpos($token, 'iPhone') !== false ||
            strpos($token, 'iPod') !== false) {
            return 'iOS';
        }

        if (strpos($token, 'Android') !== false) {
            return 'Android';
        }

        return 'Other';
    });
?>