Show products from the same product category.

gistfile1.txt

add_action('wp' , 'remove_prev_next' , 50 );
function remove_prev_next(){

	remove_action( 'woocommerce_single_product_summary', array( ASTRA_Ext_WooCommerce_Markup::get_instance(), 'next_previous_links' ), 1, 0 );
}

add_action('wp' , 'add_prev_next' , 100 );
function add_prev_next(){

	if ( 'disable' != astra_get_option( 'single-product-nav-style' ) ) {
		add_action( 'woocommerce_single_product_summary', 'next_previous_links_custom' , 1, 0 );

		function next_previous_links_custom(){
			if ( ! is_product() ) {
				return;
			}
			?>
			<div class="product-links">
				<?php
				previous_post_link( '%link', '<i class="ast-icon-previous"></i>' , true , '' , 'product_cat');
				next_post_link( '%link', '<i class="ast-icon-next"></i>' , true , '' , 'product_cat' );
				?>
			</div>
			<?php
		}
	}
}