Last Months Leaderboard Widget

/**
 * Last Months Leaderboard
 * @version 1.0
 */
add_action( 'mycred_widgets_init', 'mycred_load_last_months_leaderboard_widget' );
function mycred_load_last_months_leaderboard_widget() {

    if ( ! class_exists( 'myCRED_Widget_Last_Months_Leaderboard' ) ) {
        class myCRED_Widget_Last_Months_Leaderboard extends WP_Widget {

            // Constructor
            public function __construct() {

                parent::__construct(
                    'mycred_widget_last_months_leaderboard',
                    sprintf( '(%s) Last Months Leaderboard', mycred_label() ),
                    array(
                        'classname'   => 'widget-mycred-last-months-leaderboard',
                        'description' => 'Shows last months points leaderboard.'
                    )
                );

            }

            // Widget Output (what users see)
            public function widget( $args, $instance ) {

                extract( $args, EXTR_SKIP );

                // Load myCRED
                $mycred = mycred();

                echo $before_widget;

                // Title (if not empty)
                if ( ! empty( $instance['title'] ) )
                    echo $before_title . $mycred->template_tags_general( $instance['title'] ) . $after_title;

                echo do_shortcode( '[mycred_leaderboard number=' . $instance['number'] . ' timeframe="last-month"]' );

                echo $after_widget;

            }

            // Widget Settings (when editing / setting up widget)
            public function form( $instance ) {

                $title         = isset( $instance['title'] ) ? esc_attr( $instance['title'] ) : __( 'This Months Leaderboard', 'mycred' );
                $number        = isset( $instance['number'] ) ? abs( $instance['number'] ) : 5;

?>
<p class="myCRED-widget-field">
    <label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php _e( 'Title', 'mycred' ); ?>:</label>
    <input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'title' ) ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
</p>
<p class="myCRED-widget-field">
    <label for="<?php echo esc_attr( $this->get_field_id( 'number' ) ); ?>"><?php _e( 'Number of users', 'mycred' ); ?>:</label>
    <input id="<?php echo esc_attr( $this->get_field_id( 'number' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'number' ) ); ?>" type="text" value="<?php echo $number; ?>" size="3" class="align-right" />
</p>
<?php

            }

            // Save Widget Settings
            public function update( $new_instance, $old_instance ) {

                $instance           = $old_instance;
                $instance['number'] = absint( $new_instance['number'] );
                $instance['title']  = sanitize_text_field( $new_instance['title'] );

                return $instance;

            }

    }

    register_widget( 'myCRED_Widget_Last_Months_Leaderboard' );

}