Simple Post View Counter WordPress

function.php

<?php
/**
* Post view Count
*/
remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0);
function wpb_set_post_views($postID) {
    $count_key = 'wpb_post_views_count';
    $count = get_post_meta($postID, $count_key, true);
    if($count==''){
        $count = 0;
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, '0');
    }else{
        $count++;
        update_post_meta($postID, $count_key, $count);
    }
}
/**
 * Adding Custom Columns in mangage post table
 */
add_filter('manage_post_posts_columns', 'post_column_table_head');
function post_column_table_head( $defaults ) {
    $defaults['wpb_post_views_count']  = 'Post Views';
    return $defaults;
}
/**
 * Getting count 
 */
add_action( 'manage_post_posts_custom_column', 'post_table_content', 10, 2 );
function post_table_content( $column_name, $post_id ) {
    if ($column_name == 'wpb_post_views_count') {
    	echo get_post_meta( $post_id, 'wpb_post_views_count', true );
    }
}

index.php

<!-- THIS MONTH POPULAR POSTS --->
<ul>
<?php
$month_popular_args = array( 
                        'post_type' => 'post', 
                        'posts_per_page' => 10, 
                        'meta_key' => 'wpb_post_views_count', 
                        'orderby' => 'meta_value_num', 
                        'order' => 'DESC',
                        'date_query' => array(
                                            array(
                                                'year' => $today['year'],
                                                'month' => $today['mon'],
                                            )
                                        ) 
                    ) ;
$month_popular_query = new WP_Query( $month_popular_args );
while( $month_popular_query->have_posts() ) : $month_popular_query->the_post(); 
?>
    <li>
       <?php echo the_title(); ?>
    </li>
<?php endwhile; wp_reset_query();?>
</ul>