php [SmartCrawl]通过为MarketPress和WooCommerce产品生成和呈现产品类型OpenGraph数据来补充SmartCrawl OpenGraph

Posted 2021-05-04

<?php
/*
* Plugin Name: Product OpenGraph Data
* Plugin URI: https://premium.wpmudev.org/project/smartcrawl-wordpress-seo/
* Description: Complement SmartCrawl by generating WooCommerce OpenGraph data for SEO and Social Media
* Author: Lindeni Mahlalela @ WPMUDEV
* Author URI: https://premium.wpmudev.org/profile/mahlamusa
* License: GPLv2 or later
*/
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
if ( ! class_exists( 'Product_OpenGraph_Meta_Data' ) ) {
	class Product_OpenGraph_Meta_Data {
		private static $_instance = null;
		public static function get_instance() {
			if( is_null( self::$_instance ) ){
				self::$_instance = new Product_OpenGraph_Meta_Data();
			}
			return self::$_instance;
		}
		private function __construct() {
			add_action( 'wp_head', array($this, 'add_custom_opengraph_meta') );
        }
        
        function add_custom_opengraph_meta(){
            global $post;
            if ( $post->post_type == 'product' ) {
                $excerpt = get_the_excerpt();                
                if ( function_exists( 'wc_get_product' ) ) {
                    $product        = wc_get_product( $post );
                    $title          = $product->name;
                    $product_price  = $product->get_price();
                    $excerpt        = ( $excerpt != "" ) ? $excerpt : substr( $product->description, 0, 250);
                    $currency       = get_woocommerce_currency();
                    $stock_status   = $product->stock_status;
                } else if ( class_exists( 'MP_Product' ) ) {
                    $product        = new MP_Product( $product_id );
                    $title          = $product->post_title;
                    $product_price  = $product->get_price( 'before_coupon' );
                    $excerpt        = ( $excerpt != "" ) ? $excerpt : substr( $product->post_content, 0, 250);
                    $currency       = ( is_multisite() && mp_cart()->is_global ) ? mp_get_network_setting( 'global_currency', 'USD' ) : mp_get_setting( 'currency', 'USD' );
                    $stock_status   = $product->in_stock() ? "instock" : "outofstock";
                }     
                
                ?>    
                <meta property="og:type" content="product" />
                <meta property="og:title" content="<?php echo $title; ?>" />
                <meta property="og:description" content="<?php echo esc_html( $excerpt ); ?>" />
                <meta property="og:url" content="<?php echo get_the_permalink( $post ); ?>"/>
                <meta property="og:site_name" content="<?php echo get_bloginfo( 'name' ); ?>" />
                <meta property="product:price:amount" content="<?php echo $product_price ?>" />
                <meta property="product:price:currency" content="<?php echo $currency ?>" />
                <meta property="og:availability" content="<?php echo $stock_status; ?>" />
            <?php }
        }
	}
	add_action( 'plugins_loaded', 'plugin_load_name');
	function plugin_load_name(){
		$GLOBALS['Product_OpenGraph_Meta_Data'] = Product_OpenGraph_Meta_Data::get_instance();
	}
}