jpjuliao-post-view-tracker.php

<?php
if ( !defined('ABSPATH') ) exit();

/**
 * Plugin name: Post View Tracker
 * Plugin URI: http://jpjuliao.com/
 * Description: Track and order by post views in woocommerce.
 * Version: 1.0
 * Author: Juan Pablo Juliao
 * Author URI: https://jpjuliao.com
 * Text Domain: jpjuliao-post-view-tracker
 */
 
 class JpjuliaoPostViewsTracker {
     
     public $count_key = 'post_views_count';
     
     function __construct() {
         
        add_action('template_redirect', array($this, 'setPostViews') );
        
        add_filter( 'woocommerce_get_catalog_ordering_args', array($this, 'woocommerce_get_catalog_ordering_args') );
    
        add_filter( 'woocommerce_default_catalog_orderby_options', array($this, 'woocommerce_catalog_orderby') );
        
        add_filter( 'woocommerce_catalog_orderby', array($this, 'woocommerce_catalog_orderby') );
        
        // Remove issues with prefetching adding extra views
        remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0);
        
     }
    
    function woocommerce_get_catalog_ordering_args( $args ) {
        $orderby_value = isset( $_GET['orderby'] ) 
            ? woocommerce_clean( $_GET['orderby'] ) 
            : apply_filters( 'woocommerce_default_catalog_orderby', get_option( 'woocommerce_default_catalog_orderby' ) );
    	if ( 'views' == $orderby_value ) {
    		$args['orderby'] = 'meta_value_num';
    		$args['order'] = '';
    		$args['meta_key'] = $this->count_key;
    	}
    	return $args;
    }
     
    function woocommerce_catalog_orderby( $sortby ) {
    	$sortby['views'] = 'Views';
    	return $sortby;
    }
    
    function getPostViews($postID){
        $count_key = $this->count_key;
        $count = get_post_meta($postID, $count_key, true);
        if($count==''){
            $count = 0;
            delete_post_meta($postID, $count_key);
            add_post_meta($postID, $count_key, '0');
        }
        return printf( _n( '%s view', '%s views', $count, 'jpjuliao-post-view-tracker' ), number_format_i18n( $count ) );
    }
    
    function setPostViews() {
        global $post;
        $postID = $post->ID;
        $count_key = $this->count_key;
        $count = get_post_meta($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);
        }
    }
    
}

new JpjuliaoPostViewsTracker();