getInfoBrowser()

info_browser.php

<?php

function getInfoBrowser($agent = '')
{
    if (empty($agent)) {
        $agent = $_SERVER['HTTP_USER_AGENT'];
    }

    $browserInfo = [];
    $browserInfo['ip'] = $_SERVER['REMOTE_ADDR'];
    $browserInfo['agent'] = $agent;
    $browserInfo['platform'] = 'Unknown';
    $browserInfo['mobile'] = strpos($agent, 'Mobile') !== false;

    preg_match('/(Android)(?:\'&#x20;| )([0-9.]+)/', $agent, $Android);
    preg_match('/(Version)(?:\/| )([0-9.]+)/', $agent, $Safari);
    preg_match('/(OPR)(?:\/| )([0-9.]+)/', $agent, $Opera);
    preg_match('/(Edge|Edg)(?:\/| )([0-9.]+)/', $agent, $Edge);
    preg_match('/(Trident)(?:\/| )([0-9.]+)/', $agent, $IE);
    preg_match('/(rv)(?:\:| )([0-9.]+)/', $agent, $rv);
    preg_match('/(MSIE|Opera|Firefox|Chrome|Chromium|YandexSearch|YaBrowser)(?:\/| )([0-9.]+)/', $agent, $bi);

    $isAndroid = isset($Android[1]);
    $isLinux = strpos($agent, 'Linux') !== false && !$isAndroid;
    $isWin = strpos($agent, 'Windows') !== false;
    $isWin10 = strpos($agent, 'Windows NT 10.0') !== false;
    $isiPhone = strpos($agent, 'iPhone') !== false;
    $isiPad = strpos($agent, 'iPad') !== false;
    $isMacOS = strpos($agent, 'Mac OS') !== false && !$isiPhone && !$isiPad;

    if ($isLinux) {
        $browserInfo['platform'] = 'Linux';
    } elseif ($isAndroid) {
        $browserInfo['platform'] = 'Android';
    } elseif ($isWin) {
        $browserInfo['platform'] = 'Windows';
    } elseif ($isMacOS) {
        $browserInfo['platform'] = 'MacOS';
    } elseif ($isiPad) {
        $browserInfo['platform'] = 'iPad';
    } elseif ($isiPhone) {
        $browserInfo['platform'] = 'iPhone';
    }

    if ($Safari && !$isAndroid) {
        $browserInfo['name'] = 'Safari';
        $browserInfo['version'] = (int)$Safari[2];
    } elseif ($Opera) {
        $browserInfo['name'] = 'Opera';
        $browserInfo['version'] = (int)$Opera[2];
    } elseif ($Edge) {
        $browserInfo['name'] = 'Edge';
        $browserInfo['version'] = (int)$Edge[2];
    } elseif ($IE) {
        $browserInfo['name'] = 'IE';
        $browserInfo['version'] = isset($rv[2]) ? (int)$rv[2] : ($isWin10 ? 11 : (int)$IE[2]);
    } else {
        $browserInfo['name'] = isset($bi[1]) ? $bi[1] : ($isAndroid ? 'Android' : 'Unknown');
        $browserInfo['version'] = isset($bi[2]) ? (int)$bi[2] :  ($isAndroid ? (float)$Android[2] : 0);
    }

    $browsers = [
        'Chrome' => 32,
        'Firefox' => 65,
        'Opera' => 19,
        'Edge' => 18,
        'YaBrowser' => 1,
        'YandexSearch' => 1,
        'Android' => 4.2,
        'MacOS' => 15,
        'iPad' => 14,
        'iPhone' => 14
    ];
    if ($browserInfo['name'] == 'Safari') {
        $browserInfo['webp'] = in_array($browserInfo['platform'], array_keys($browsers)) && ($browserInfo['version'] >= $browsers[$browserInfo['platform']]);
    } else {
        $browserInfo['webp'] = in_array($browserInfo['name'], array_keys($browsers)) && ($browserInfo['version'] >= $browsers[$browserInfo['name']]);
    }
    return $browserInfo;
}

info_browser_joomla3.php

<?php

/*
EN: WARNING!
Joomla incorrectly determines the browser version for some Chinese’s native browsers!
For example, version 4.0 is defined for meizu devices, although Chrome/57 is lit in the useragent.

RU: ВАЖНО!
Joomla некорректно определяет версию браузера для "родных" браузеров некоторых китайцев!
Например, для аппаратов meizu определяется версия 4.0, хотя в useragent светится Chrome/57.
*/

function isWebP()
{
    $client = \Joomla\CMS\Factory::getApplication()->client;
    $browsers = [
        19 => 32, // chrome
        18 => 65, // firefox
        21 => 19, // opera
        23 => 18, // edge
        9 => 4.2, // adndroid
        22 => 4.2, // android tablet
        24 => 32 // blink
    ];
    return (bool)in_array($client->browser, array_keys($browsers)) && ($client->browserVersion >= $browsers[$client->browser]); 
}