Stop WordPress plugin update check

gistfile1.aw

<?php
add_filter( 'http_request_args', 'dm_prevent_update_check', 10, 2 );
function dm_prevent_update_check( $r, $url ) {
        if ( 0 === strpos( $url, 'http://api.wordpress.org/plugins/update-check/' ) ) {
                $my_plugin = plugin_basename( __FILE__ );
                $plugins = unserialize( $r['body']['plugins'] );
                unset( $plugins->plugins[$my_plugin] );
                unset( $plugins->active[array_search( $my_plugin, $plugins->active )] );
                $r['body']['plugins'] = serialize( $plugins );
        }
        return $r;
}
?>