system/helper/device.php

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<?php
function is_mobile()
{
    return (new Mobile_Detect)->isMobile() && !(new Mobile_Detect)->isTablet();
}

function is_tablet()
{
    return (new Mobile_Detect)->isTablet();
}

function is_desktop()
{
    return !(new Mobile_Detect)->isMobile() && !(new Mobile_Detect)->isTablet();
}

function is_weixin()
{
    if (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false) {
        return true;
    } else {
        return false;
    }
}

/**
 * Mobile Detect Library
 * =====================
 *
 * Motto: "Every business should have a mobile detection script to detect mobile readers"
 *
 * Mobile_Detect is a lightweight PHP class for detecting mobile devices (including tablets).
 * It uses the User-Agent string combined with specific HTTP headers to detect the mobile environment.
 *
 * @author      Current authors: Serban Ghita <serbanghita@gmail.com>
 *                               Nick Ilyin <nick.ilyin@gmail.com>
 *
 *              Original author: Victor Stanciu <vic.stanciu@gmail.com>
 *
 * @license     Code and contributions have 'MIT License'
 *              More details: https://github.com/serbanghita/Mobile-Detect/blob/master/LICENSE.txt
 *
 * @link        Homepage:     http://mobiledetect.net
 *              GitHub Repo:  https://github.com/serbanghita/Mobile-Detect
 *              Google Code:  http://code.google.com/p/php-mobile-detect/
 *              README:       https://github.com/serbanghita/Mobile-Detect/blob/master/README.md
 *              HOWTO:        https://github.com/serbanghita/Mobile-Detect/wiki/Code-examples
 *
 * @version     2.8.24
 */
class Mobile_Detect
{
    /**
     * Mobile detection type.
     *
     * @deprecated since version 2.6.9
     */
    const DETECTION_TYPE_MOBILE = 'mobile';

    /**
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