Post views count without plugin

// Add this to your functions.php file.
      
    // function to display number of posts.
    function getPostViews($postID){
        $count_key = 'post_views_count';
        $count = get_post_meta($postID, $count_key, true);
        if($count==''){
            delete_post_meta($postID, $count_key);
            add_post_meta($postID, $count_key, '0');
            return "0 View";
        }
        return $count.' Views';
    }
      
    // function to count views.
    function setPostViews($postID) {
        $count_key = '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);
        }
    }
      
      
    // Add it to a column in WP-Admin
    add_filter('manage_posts_columns', 'posts_column_views');
    add_action('manage_posts_custom_column', 'posts_custom_column_views',5,2);
    function posts_column_views($defaults){
        $defaults['post_views'] = __('Views');
        return $defaults;
    }
    function posts_custom_column_views($column_name, $id){
        if($column_name === 'post_views'){
            echo getPostViews(get_the_ID());
        }
    }
      
    //Add this to your single.php, and make sure you paste in inside the loop.
      
    
      
      
      
      
    //To display the number of views a post has, just add this in your template where you want the post view count to be displayed.
      
    
      
    //sourse -
 
http://wp-snippet.com/track-show-post-views-without-plugin