Detects if visitor is using a mobile device

mobile_check.php

<?php

function isMobileBrowser()
{
    $user_agent     = $_SERVER['HTTP_USER_AGENT'];
    $mobileBrowser  = false; 

    // iPhone check
    if( eregi('ipod',$user_agent)|| eregi('iphone',$user_agent) )
    {
        $mobileBrowser = true;
    }

    // Black Berry check
    if( eregi('blackberry',$user_agent) )
    { 
        $mobileBrowser = true; 
    }

    // End Opera check
    if( eregi('opera mini',$user_agent) )
    {
        $mobileBrowser = true;
    }

    // Android check
    if( eregi('android',$user_agent) )
    {
        $mobileBrowser = true;
    }

    // Palm check
    if( preg_match('/(palm os|hiptop|avantgo|blazer|xiino|plucker|palm|elaine)/i', $user_agent) )
    {
        $mobileBrowser = true;
    }

    // Windows phone check
    if( preg_match('/(windows ce; ppc;|windows ce; smartphone;|windows ce; iemobile)/i', $user_agent) )
    { 
        $mobileBrowser = true;
    }
    
    return $mobileBrowser;
}

echo ( isMobileBrowser() ) ? 'Mobile user' : 'desktop user';

?>