How To Track & Display Post Views Count in WordPress Without a Plugin

ID;    
    }
    wpb_set_post_views($post_id);
}
add_action( 'wp_head', 'wpb_track_post_views');

/*********************************CODE-3********************************************
* @Author: Boutros AbiChedid 
* @Date:   January 16, 2012
* @Websites: http://bacsoftwareconsulting.com/ ; http://blueoliveonline.com/
* @Description: Adds a Non-Sortable 'Views' Columnn to the Post Tab in WP dashboard.
* This code requires CODE-1(and CODE-2) as a prerequesite.
* Code is browser and JavaScript independent.
* @Tested on: WordPress version 3.2.1
***********************************************************************************/

//Gets the  number of Post Views to be used later.
function get_PostViews($post_ID){
    $count_key = 'wpb_post_views_count';
    //Returns values of the custom field with the specified key from the specified post.
    $count = get_post_meta($post_ID, $count_key, true);

    return $count;
}

//Function that Adds a 'Views' Column to your Posts tab in WordPress Dashboard.
function post_column_views($newcolumn){
    //Retrieves the translated string, if translation exists, and assign it to the 'default' array.
    $newcolumn['post_views'] = __('Views');
    return $newcolumn;
}

//Function that Populates the 'Views' Column with the number of views count.
function post_custom_column_views($column_name, $id){

    if($column_name === 'post_views'){
        // Display the Post View Count of the current post.
        // get_the_ID() - Returns the numeric ID of the current post.
        echo get_PostViews(get_the_ID());
    }
}
//Hooks a function to a specific filter action.
//applied to the list of columns to print on the manage posts screen.
add_filter('manage_posts_columns', 'post_column_views');

//Hooks a function to a specific action. 
//allows you to add custom columns to the list post/custom post type pages.
//'10' default: specify the function's priority.
//and '2' is the number of the functions' arguments.
add_action('manage_posts_custom_column', 'post_custom_column_views',10,2);
?>