WooCommerce Student Discount issue

Question

I am trying to give a discount on Woocommerce on Wordpress if email is .ac.uk.

I found a solution on this answer

I tried to use above solution but it gave this error:

syntax error, unexpected ')'

On line:

$mail_tld = $domain_part[1] . '.' . $domain_part[2]);

Any ideas how to resolve?

Answer 1

$mail_tld = ($domain_part[1] . '.' . $domain_part[2]);

add '(' in this line.