Revision: 57537
                            
                                                            
                                    
                                        
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                        at May 30, 2012 22:17 by planetabhi
                            
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function cwc_maintenance_mode() {
    if ( !current_user_can( 'edit_themes' ) || !is_user_logged_in() ) {
        wp_die('Maintenance, please come back soon.');
    }
}
add_action('get_header', 'cwc_maintenance_mode');
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Just paste the following snippet into your functions.php file and save it.
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When you need to put your wordpress blog on hold while performing some maintenance.
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wordpress
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PHP