如何印出 macOS 的版本？甚至作業(yè)系統(tǒng)名字？

使用 $_SERVER['HTTP_USER_AGENT'] 後印出：

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

在網(wǎng)上找到

function os_info($uagent)
{
    // the order of this array is important
    global $uagent;
    $oses   = array(
        'Win311' => 'Win16',
        'Win95' => '(Windows 95)|(Win95)|(Windows_95)',
        'WinME' => '(Windows 98)|(Win 9x 4.90)|(Windows ME)',
        'Win98' => '(Windows 98)|(Win98)',
        'Win2000' => '(Windows NT 5.0)|(Windows 2000)',
        'WinXP' => '(Windows NT 5.1)|(Windows XP)',
        'WinServer2003' => '(Windows NT 5.2)',
        'WinVista' => '(Windows NT 6.0)',
        'Windows 7' => '(Windows NT 6.1)',
        'Windows 8' => '(Windows NT 6.2)',
        'Windows 8.1' => '(Windows NT 6.3)',
        'Windows 10' => '(Windows NT 10.0)',
        'WinNT' => '(Windows NT 4.0)|(WinNT4.0)|(WinNT)|(Windows NT)',
        'OpenBSD' => 'OpenBSD',
        'SunOS' => 'SunOS',
        'Ubuntu' => 'Ubuntu',
        'Android' => 'Android',
        'Linux' => '(Linux)|(X11)',
        'iPhone' => 'iPhone',
        'iPad' => 'iPad',
        'MacOS' => '(Mac_PowerPC)|(Macintosh)',
        'QNX' => 'QNX',
        'BeOS' => 'BeOS',
        'OS2' => 'OS/2',
        'SearchBot' => '(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp)|(MSNBot)|(Ask Jeeves/Teoma)|(ia_archiver)'
    );
    $uagent = strtolower($uagent ? $uagent : $_SERVER['HTTP_USER_AGENT']);
    foreach ($oses as $os => $pattern)
        if (preg_match('/' . $pattern . '/i', $uagent))
            return $os;
    return 'Unknown';
}
echo os_info($uagent);

這個(gè)可以印出 「MacOS」
但假設(shè)我想印出後面的版本「 10_10_5 」能用什麼代碼做到？因?yàn)殚L(zhǎng)度會(huì)不一定