Making an IE only site (Like a Mobile only site)

maybe you can somehow use template redirect? I’m not too clear on how it works, but it may be worth investigating.

function my_check_is_ie() {
    global $is_winIE;
    if ( ! $is_winIE ) return;

    // load template for IE
    include(TEMPLATEPATH . '/IE_template.php');

    // or maybe?
    if( is_home() ) include(TEMPLATEPATH . '/IE_home.php');
    elseif( is_single() ) include(TEMPLATEPATH . '/IE_single.php');
    // etc.
}

add_action('template_redirect', 'my_check_is_ie');

Edit– ok, I think I’ve figured it out. I haven’t tested this in the wild, so make sure it works first! You’ll have to make this a plugin, since once the theme is loaded it’s too late to pull the theme switch…

<?php
/*
Plugin Name: randomkljsaduiyerth
*/
global $is_winIE;
if($is_winIE){
    add_filter('template', 'my_switch_themes');
    add_filter('stylesheet', 'my_switch_themes');
}
function my_switch_themes(){
    // return the name of your IE theme
    return 'my-IE-theme-Name-Here'; 
}

Edit2–

you could add another check for the presence of a GET variable if you wanted to let people switch via a link like: http://yourdomain.com/?IE_version

if( isset($_GET['IE_version']) ):
    // add_filter here, or better yet if you're doing a number of checks,
    // set a flag if any check is true and add_filter last
endif;

you could also use cookies to store the theme preference

// check the cookie
if( isset($_COOKIE["my_domain_cookie"]) )

// set the cookie
setcookie("my_domain_cookie", "My Cookie Val", time()+60*60*24*30);

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