<?php
function hwid_load_custom_tab( $tab_key, $tab_info ) {
	echo apply_filters( 'the_content', $tab_info['tabContent'] );
}

function hwid_add_content_tabs( $tabs ) {

	global $post;

	$custom_tabs = get_field( 'tabs', $post->ID );

	foreach( $custom_tabs as $index => $tab ) {
		$tabs['customTab-' . $index] = array(
			'title' => $tab['tab_title'],
			'priority' => 20 + $index,
			'tabContent' => $tab['tab_content'],
			'callback' => 'hwid_load_custom_tab'
		);
	}

	return $tabs;
}

add_filter( 'woocommerce_product_tabs', 'hwid_add_content_tabs' );