WordPress at a glance
filter is not described

post_class filter-hook . WC 1.0

Usage

add_filter( 'post_class', 'filter_function_name_8065', 10, 3 );
function filter_function_name_8065( $post_classes, $class, $product_id ){
	// filter...

	return $post_classes;
}
$post_classes
-
$class
-
$product_id
-

Where the hook is called

wc_get_product_class()
post_class
woocommerce/includes/wc-template-functions.php 639
$post_classes = apply_filters( 'post_class', $post_classes, $class, $product->get_id() );

Where in WP core the hook is used WooCommerce

woocommerce/includes/wc-template-functions.php 636
remove_filter( 'post_class', 'wc_product_post_class', 20 );
woocommerce/includes/wc-template-functions.php 642
add_filter( 'post_class', 'wc_product_post_class', 20, 3 );
woocommerce/includes/wc-template-hooks.php 14
add_filter( 'post_class', 'wc_product_post_class', 20, 3 );