browser.php

<?php

class browser {

    function is_mobile() {
        $iPod = stripos($_SERVER['HTTP_USER_AGENT'], "iPod");
        $iPhone = stripos($_SERVER['HTTP_USER_AGENT'], "iPhone");
        $iPad = stripos($_SERVER['HTTP_USER_AGENT'], "iPad");
        $Android = stripos($_SERVER['HTTP_USER_AGENT'], "Android");
        $webOS = stripos($_SERVER['HTTP_USER_AGENT'], "webOS");

        if ($iPod || $iPhone || $iPad || $Android || $webOS) {
           return true;
        }else {
            return false;
        }
    }

    /**
     * http://ageekandhisblog.com/use-php-to-detect-internet-explorer-11-and-below/
     * It’s simple and it works well. The first part targets IE10 and below, 
     * while the second targets the newer IE11 user agent. Modify as needed.
     */
    function is_ie() {
        return (preg_match('~MSIE|Internet Explorer~i', $_SERVER['HTTP_USER_AGENT']) || (strpos($_SERVER['HTTP_USER_AGENT'], 'Trident/7.0; rv:11.0') !== false)) ? true : false;
    }

}

?>