WordPress: How to set default (active) theme via script

I need to assign the “active” theme via script. Anyone know the API call needed to do this? Also, how do I retrieve the current theme via script (PHP)?

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  1. In current WordPress version 3.4.2 you need to update 3 options to switch to another theme(minihyper – in my case)

    update_option('template', 'minihyper');
    update_option('stylesheet', 'minihyper');
    update_option('current_theme', 'Mini Hyper');
    

    The first two options are key, the third really does nothing except maybe you can use this option somewhere in code to display current theme name.

    Update:

    Here is a true way:

    <?php switch_theme( $template, $stylesheet ) ?>
    

    Example with minihyper:

    <?php switch_theme( 'minihyper', 'minihyper' ) ?>