What is the script to to detect mobile devices

Question

Hello, I have to make 2versions of my site, i.e., 1 version for Mobile phone and 1 version for our PC. So I have a script as follows:-

<?php 
if ( stristr($ua, "Windows CE") or stristr($ua, "AvantGo") or 
     stristr($ua,"Mazingo") or stristr($ua, "Mobile") or stristr($ua, "T68") or
     stristr($ua,"Syncalot") or stristr($ua, "Blazer") or 
     stristr($ua,"Mozilla") or stristr($ua,"Firefox") )
{
     $DEVICE_TYPE="MOBILE";
}
if (isset($DEVICE_TYPE) and $DEVICE_TYPE=="MOBILE") 
{
    $location='mobile/entry.html';
    header ('Location: '.$location);
    exit;
}
else
{ 
    $location='entry.html';
    header ('Location: '.$location);
    exit;
}
?>

This script works well with my PC, but if I try to access my site from mobile, I cannot redirect to the same page as I want.

Can anyone help me resolve this issue?

Thanks in Advance.

Answer 1

You can read Lightweight Device-Detection in PHP

Answer 2

The best option is not to try and redirect based on user-agent sniffing, but to put your mobile content onto a specific url, and make those options available. User-agent sniffing is ok up to a point, but you cannot rely on it 100%. Related to this, PPK's post on javascript detection is good reading.

That said, if you are dead set on doing user-agent redirection, you will need to have some way to be able to update your list of devices, and user-agent strings - something like codeigniter's user agent class will be more useful over the long run.