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function is_iphone()
{
    $ua = $_SERVER['HTTP_USER_AGENT'];
    if(
    strpos($ua, 'iPhone')!== false||
    strpos($ua, 'iPod')!== false
    )
    {
    return true;
    }
    else
    {
    return false;
    }
}
function is_android()
{
    $ua = $_SERVER['HTTP_USER_AGENT'];
    if(
    strpos($ua, 'Android')!== false&&strpos($ua, 'Mobile')!== false
    )
    {
    return true;
    }
    else
    {
    return false;
    }
}
function is_firefox_os()
{
    $ua = $_SERVER['HTTP_USER_AGENT'];
    if(
    strpos($ua, 'Android')=== false&&strpos($ua, 'Firefox')!== false&&strpos($ua, 'Mobile')!== false
    )
    {
    return true;
    }
    else
    {
    return false;
    }
}
function is_windows_phone()
{
    $ua = $_SERVER['HTTP_USER_AGENT'];
    if(
    strpos($ua, 'Windows')!== false&&strpos($ua, 'Phone')!== false
    )
    {
    return true;
    }
    else
    {
    return false;
    }
}
function is_blackberry()
{
    $ua = $_SERVER['HTTP_USER_AGENT'];
    if(
    strpos($ua, 'BlackBerry')!== false
    )
    {
    return true;
    }
    else
    {
    return false;
    }
}
function is_ktai()
{
    $ua = $_SERVER['HTTP_USER_AGENT'];
    if(
    strpos($ua, 'DoCoMo')!== false||
    strpos($ua, 'KDDI')!== false||
    strpos($ua, 'UP.Browser')!== false||
    strpos($ua, 'MOT-')!== false||
    strpos($ua, 'J-PHONE')!== false||
    strpos($ua, 'WILLCOM')!== false||
    strpos($ua, 'Vodafone')!== false||
    strpos($ua, 'SoftBank')!== false
    )
    {
    return true;
    }
    else
    {
    return false;
    }
}
function is_mymobile()
{
    if(
    is_ktai()||
    is_iphone()||
    is_android()||
    is_firefox_os()||
    is_windows_phone()||
    is_blackberry()
    )
    {
    return true;
    }
    else
    {
    return false;
    }
}