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I have some users coming in from a fixed IP range on a very slow connection (256kbps) so want to server them a child theme that has a lot of the bandwidth intensive features removed. For ease of management/maintanability a child theme is preferred to a seperate theme.

I have setup a plugin so I can detect IP, and trigger:

add_action('setup_theme', 'switch_user_theme');
function switch_user_theme() {
    $ip = $_SERVER['REMOTE_ADDR'];
    if ( $ip == 'x.x.x.x' ) {
         $user_theme = 'baspresslite';
         add_filter( 'template', create_function( '$t', 'return "' . $user_theme . '";' ) );
         add_filter( 'stylesheet', create_function( '$s', 'return "' . $user_theme . '";' ) );
    }
}

This works fine for switching users to a seperate theme, but not to a child theme as a child theme needs to also call files from the parent theme - it seems these filters basically do a rewrite on all requests.

How can this be achieved? Are there alternative filters / actions to hook in to? Or maybe a rewrite action in .htaccess that says if you try to load a file and it isn't found then try this alternative path replacing the child theme name with the parent theme (potential redirect loop here though)?

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