How to change array properties within a class from member function - php

Question

In the code below, I'm trying to alter the $widget_ops "classname" array, based on the value of the $line_above variable in the "widget" function. I'm not sure how to address the array to change the value.
Is this possible?
class my_widget extends WP_Widget {
function my_widget() {
$widget_ops = array('classname' => 'test', 'description' => __( "test") );
$control_ops = array('width' => 450, 'height' => 100, 'id_base' => 'my_widget' );
$this->WP_Widget('my_widget', __('Test: test'), $widget_ops, $control_ops);
}
function widget( $args, $instance ) {
extract($args);
$title = apply_filters( 'widget_title', empty($instance['title']) ? '' : $instance['title'], $instance );
$text = apply_filters( 'widget_text', $instance['text'], $instance );
$line_above = isset( $instance['line_above'] ) ? $instance['line_above'] : false;
if($line_above){
//TRYING TO ALTER THE CLASS HERE BASED ON VARIABLE
$widget_ops['classname'] .= " border-top";
}
}
}

Answer 1

You could make it global:
class my_widget extends WP_Widget {
private $widget_ops;
function my_widget() {
$this->widget_ops = array('classname' => 'test', 'description' => __( "test") );
$control_ops = array('width' => 450, 'height' => 100, 'id_base' => 'my_widget' );
$this->WP_Widget('my_widget', __('Test: test'), $this->widget_ops, $control_ops);
}
function widget( $args, $instance ) {
extract($args);
$title = apply_filters( 'widget_title', empty($instance['title']) ? '' : $instance['title'], $instance );
$text = apply_filters( 'widget_text', $instance['text'], $instance );
$line_above = isset( $instance['line_above'] ) ? $instance['line_above'] : false;
if($line_above){
//TRYING TO ALTER THE CLASS HERE BASED ON VARIABLE
$this->widget_ops['classname'] .= " border-top";
}
}
}