Create Array from data in the OPTIONS table

$all_options = wp_load_alloptions();
$plugin_order_options = array();
foreach( $all_options as $name => $value ) {
    if(stristr($name, 'plugin_order_')) $plugin_order_options[$name] = $value;
}
print_r($plugin_order_options);

In plain English:

We load all WP options in $all_options. We copy options from $all_options to $plugin_order_options if their name contains plugin_order_. We print $plugin_order_options. We scratch our head, unhappy with the size of the customized mono-spaced font of our browser. We should have left it default.

As mentioned by @Rarst, wp_autoload_options() will retrieve all autoload options or all options, if no autoloaded ones exist. So, if the above code doesn’t work for you, you might want to try this one:

$options = $wpdb->get_results( "SELECT * FROM $wpdb->options ORDER BY option_name" );

foreach ( (array) $options as $option ) :
    if ( $option->option_name == '' )
        continue;
    $name = esc_attr( $option->option_name );
    if(stristr($name, 'plugin_order_'))
        $plugin_order_options[$name] = is_serialized( $option->option_value ) ? 
            maybe_unserialize( $option->option_value ) :
            $option->option_value;
endforeach;

print_r($plugin_order_options);

It basically fetches all entries from wp_options table, and for those who have plugin_order_ in their name it passes the value to our $plugin_order_options array. This time I also check if data is serialized and attempt to unserialize it.