gistfile1.txt

<?php

/**
 * Category and product tag og:image fix for SEO by yoast / woocommerce
 */

function fabframe_print_custom_og_image()
{
	if ( is_product_category() ) {
		global $post;
		$args = array( 'taxonomy' => 'product_cat',);
		$terms = wp_get_post_terms( $post->ID, 'product_cat', $args );

		if ( count( $terms ) > 0 ) {
			$og_image = get_field( 'custom_og_image', 'product_cat_' . $terms[0]->term_id );
			if ( $og_image ) {
				printf( '<meta property="og:image" content="%s" />', $og_image );
			}
		}
	}

	if ( is_product_tag() ) {
		global $post;
		$args = array( 'taxonomy' => 'product_tag',);
		$terms = wp_get_post_terms( $post->ID, 'product_tag', $args );

		if ( count( $terms ) > 0 ) {
			$og_image = get_field( 'custom_og_image', 'product_tag_' . $terms[0]->term_id );
			if ( $og_image ) {
				printf( '<meta property="og:image" content="%s" />', $og_image );
			}
		}
	}
}
add_action( 'wp_head', 'fabframe_print_custom_og_image' );