how to i use <? php ?> to delete cookies from web sight

Question

i dont udnerstand what to do for this

Answer 1

<?php and ?> Are starting and ending tags of PHP i.e. the PHP code must be inside those tags.
Secondly,
To delete cookies, use unset function. Eg. unset($_COOKIE['Hello']);

Please refer this tutorial -
https://www.sololearn.com/learn/PHP/1843/

Answer 2

Thank you very much friend!