recent_products.php

/*
Plugin Name: Set Shop Cookie
Description: Adds a cookie for most recently viewed products
Version: 0.1
Author: Casey Lee
Author URL: https://simplethemes.com
*/

class SetWpShopCookie {

    /**
    *   @var string API URL
    */
    public static $instance;

    public $recent_cookie;
    public $cookie_name = 'recent';
    public $recent_products;


    /** Hook WordPress
    *   @return void
    */
    public function __construct()
    {
        self::$instance = $this;
        add_action( 'template_redirect', array( $this, 'get_recent_cookie') );
        add_action( 'template_redirect', array( $this, 'set_post_cookie') );
        add_shortcode( 'recently_viewed', array( $this, 'recent_products') );

    }


    /**
     * Gets the 'recent' cookie
     * @return array or null
     */
	public function get_recent_cookie()
	{
		$recent_cookie = null;
  		$cookies = array();
  		foreach ( $_COOKIE as $name => $value ) {
  			$cookies[] = new WP_Http_Cookie( array( 'name' => $name, 'value' => $value ) );
  		}
		foreach($cookies as $cookie) {
		    if ($this->cookie_name == $cookie->name) {
		        $recent_cookie = $cookie;
		        break;
		    }
		}
		$this->recent_cookie = $recent_cookie;
	}


    /**
     * Load scripts when plugin is executed
     * @see  https://developer.wordpress.org/reference/classes/wp_http_cookie/
     */
    public function set_post_cookie()
    {
      	global $post;
      	$product_id = $post->ID;
      	$cookie_time = time() + 60 * 60 * 24 * 7;

      	// nothing to do here if we're not in a product single
      	if (!is_product())
      		return;

      	// create the cookie
  		if(!$this->recent_cookie) {

  			$data = array();
            array_unshift($data, $product_id);
            setcookie($this->cookie_name, serialize($data), $cookie_time, COOKIEPATH, COOKIE_DOMAIN);

         // update existing cookie
	     } else {

	     	$data = unserialize($this->recent_cookie->value);
            if(!in_array($product_id, $data)) {
                array_unshift($data, $product_id);
                if(count($data) > 8) {
                    array_pop($data);
                }
                // Use WP globals for portable cookie settings
                setcookie($this->cookie_name, serialize($data), $cookie_time, COOKIEPATH, COOKIE_DOMAIN);
            }

	     }
	     // Debug
	    // var_dump($this->recent_cookie);

	}

	// Recently viewed products shortcode
	function recent_products( $atts ) {

		// Attributes
		$atts = shortcode_atts(
			array(
				'count' => '5',
			),
			$atts,
			'recently_viewed'
		);
		$product_data = unserialize($this->recent_cookie->value);
		$str = '';
		if ($product_data) {
			foreach ($product_data as $products_viewed) {
				$str .= $products_viewed .' ,';
			}
			return 'You recently viewed these products: ' . rtrim($str,',');
		} else {
			return 'Why don\'t you visit our shop?';
		}

	}
}
new SetWpShopCookie;