echo not displaying text in a wordpress widget - php

Question

So I am trying to make a WordPress widget that echoes out the movie input. I've put the echo in line 10 of the widget function however it doesn't echo out the input. Now I know I could swap this out to echo $instance['movie']; , however I want to test that my movie_search method works, which it isn't. Any help is appreciated and sorry if this answer is really stupid I am still quite new to coding.
<?php
public function widget( $args, $instance) {
echo $args['before_widget'];
if (!empty( $instance['tmdbapikey'] ) ) {
echo $args['before_tmdbapikey'].apply_filters(
'widget_tmdbapikey',
$instance['tmdbapikey']
).$args['after_tmdbapikey'];
}
//widget content output
echo $movie_query;
// whatever you want to display after widget (<div>, etc)
echo $args['after_widget'];
}
public function form( $instance ) {
$tmdbapikey = !empty( $instance['tmdbapikey'] )
? $instance['tmdbapikey']
: esc_html__( '', 'mpd_domain' );
<p>
<label for="<?php echo esc_attr($this->get_field_id('movie')); ?>">
<?php esc_attr_e('movie:', 'mpd_domain'); ?>
</label>
<input
class="widefat"
id="<?php echo esc_attr( $this->get_field_id( 'movie' ) ); ?>"
name="<?php echo esc_attr( $this->get_field_name( 'movie' ) ); ?>"
type="text"
value="<?php echo esc_attr( $movie ); ?>">
</p>
This is the method for saving inputted user string.
public function update( $new_instance, $old_instance ) {
$instance = array();
$instance['tmdbapikey'] = (!empty($new_instance['tmdbapikey']))
? sanitize_text_field( $new_instance['tmdbapikey'] )
: '';
$instance['movie'] = (!empty($new_instance['movie']))
? sanitize_text_field($new_instance['movie'])
: '';
$instance['size'] = (!empty( $new_instance['size']))
? sanitize_text_field($new_instance['size'])
: '';
$instance['description'] = (!empty( $new_instance['description']))
? sanitize_text_field($new_instance['description'])
: '';
return $instance;
}
Movie search method
public function movie_search(){
//copies inputted data to movie variable
$movie_query = $instance['movie'];
}

Answer 1

Had to pass the $instance into the $movie_search method. So the line should have been public function movie_search($instance) as the variable was not a global variable like I originally thought it was, leaving it an empty variable. Also needed to add a return $movie_search to the last line of the movie search method.
Hence I had to change line 10 to echo $this->movie_search($instance).