View My Site on Desktop only - block mobile access

I have a website that I only want viewed from a regular web browser on a desktop or laptop.  I don't want it viewed from a phone or ipad, etc.  

How do I create an else statement that  will direct desktop users to the website if you are on a desktop or laptop?

PHP is the code this site is written in

Thank you.
U_S_AAsked:
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IanThCommented:
why ?

phones and tablets are becoming more and more mainstream for browsing the web

are you thinking that the webdesign can not be what a desktop or laptop is normally bigger that a mobile web site ?

thats not true at all
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IanThCommented:
If you want a normal web that send mobile visitors to a mobile version you can do a css file that switches on a viewport directive

see
http://www.evotech.net/blog/2007/07/web-development-for-the-iphone/

and
http://www.iphonecompatible.net/design-tips-tools/define-a-viewport/

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U_S_AAuthor Commented:
Ian,

I have a site - m.sitename.com

users that normally go to sitename.com from their desktop have been bypassing my regular site and going to the mobile site ,, from their desktop

by doing this ,, they are also bypassing most of my adsense links

that is why I want to have the mobile users only accessing the mobile version of the site,, and not letting the desktop users to have access to the mobile version.
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IanThCommented:
see
http://css-tricks.com/snippets/javascript/redirect-mobile-devices/


and if you think about it do a similat thing on m.sitename.com

as I dont think you can do it at the dns system as that would be better mind you are you running dns local? As that might also work thinking about it
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Ray PaseurCommented:
You can detect the browser in PHP.  It is usually found in $_SERVER["HTTP_USER_AGENT"] and looks something like Mozilla/5.0 (Windows NT 6.1; rv:8.0.1) Gecko/20100101 Firefox/8.0.1.

Check these links for more.
http://php.net/manual/en/function.get-browser.php
http://php.net/manual/en/misc.configuration.php (look for "browscap").

To see what a mobile browser looks like, install this script and visit the site from your i-phone

<?php phpinfo();

Once you have detected a stationary browser in the mobile scripts, you can issue this command to redirect

<?php header("Location: path/to/stationary/site/");
exit;
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U_S_AAuthor Commented:
These are all good answers.
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