[Pandemikk]

There was some merit in checking around init_start.

// Test mobile browser
$mobile_browser = false;
$mobile_browser_advanced = false;
if ($vbulletin->options['mobilestyleid_advanced'] OR $vbulletin->options['mobilestyleid_basic'])
{
    if (stripos($_SERVER['HTTP_USER_AGENT'], 'windows') === false OR preg_match('/(Windows Phone OS)/i', strtolower($_SERVER['HTTP_USER_AGENT'])))
    {
        if (
            preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone|android|Windows Phone OS)/i', strtolower($_SERVER['HTTP_USER_AGENT']))
            OR
            stripos($_SERVER['HTTP_ACCEPT'],'application/vnd.wap.xhtml+xml') !== false
            OR
            ((isset($_SERVER['HTTP_X_WAP_PROFILE']) OR isset($_SERVER['HTTP_PROFILE'])))
            OR
            stripos($_SERVER['ALL_HTTP'],'OperaMini') !== false
        )
        {
            $mobile_browser = true;
        }
        // This array is big and may be bigger later on. So we move it to a second if.
        else if (in_array(
                    strtolower(substr($_SERVER['HTTP_USER_AGENT'], 0, 4)),
                    array(
                    'w3c ','acs-','alav','alca','amoi','audi','avan','benq','bird','blac',
                    'blaz','brew','cell','cldc','cmd-','dang','doco','eric','hipt','inno',
                    'ipaq','java','jigs','kddi','keji','leno','lg-c','lg-d','lg-g','lge-',
                    'maui','maxo','midp','mits','mmef','mobi','mot-','moto','mwbp','nec-',
                    'newt','noki','oper','palm','pana','pant','phil','play','port','prox',
                    'qwap','sage','sams','sany','sch-','sec-','send','seri','sgh-','shar',
                    'sie-','siem','smal','smar','sony','sph-','symb','t-mo','teli','tim-',
                    'tosh','tsm-','upg1','upsi','vk-v','voda','wap-','wapa','wapi','wapp',
                    'wapr','webc','winw','winw','xda ','xda-')
                )
            )
        {
            $mobile_browser = true;
            if(strtolower(substr($_SERVER['HTTP_USER_AGENT'], 0, 4)) == 'oper' AND  preg_match('/(linux|mac)/i', $_SERVER['HTTP_USER_AGENT']))
            {
                $mobile_browser = false;
            }
        }
    }

    if (
        $mobile_browser
            AND
        preg_match('/(ipad|ipod|iphone|blackberry|android|pre\/|palm os|palm|hiptop|avantgo|plucker|xiino|blazer|elaine|Windows Phone OS)/i', strtolower($_SERVER['HTTP_USER_AGENT']))
    )
    {
        $mobile_browser_advanced = true;
    }
}