How to detect if a mobile device visits your website?

I just investigated how to answer the question mentioned in the headline – and found a pretty easy solution:

There’s a very smart tutorial given on the following page:
http://mobiforge.com/developing/story/lightweight-device-detection-php

Here’s a slightly modified php version of it:
(Code taken and edited from http://mobiforge.com/developing/story/lightweight-device-detection-php)

function IsMobileDevice()
{
    if (preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone|android)/i', strtolower($_SERVER['HTTP_USER_AGENT'])))
        return true;

    if ((strpos(strtolower($_SERVER['HTTP_ACCEPT']),'application/vnd.wap.xhtml+xml') > 0) or ((isset($_SERVER['HTTP_X_WAP_PROFILE']) or isset($_SERVER['HTTP_PROFILE']))))
        return true;

    $mobile_ua = strtolower(substr($_SERVER['HTTP_USER_AGENT'], 0, 4));
    $mobile_agents = 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-');

    if (in_array($mobile_ua,$mobile_agents))
        return true;

    if (strpos(strtolower($_SERVER['ALL_HTTP']),'OperaMini') > 0)
        return true;

    if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'windows') > 0)
        return true;

    return false;
}

if(IsMobileDevice()){
    // Redirect to subdomain or do something else
    header("Location: http://mobile.example.com");
    exit();
}

// Load normal page content

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