How to add whatapp chat in new window in a php application [closed]

<li> <?php echo lang('phone'); ?>

<span

class="label pull-right r-activity"><?php echo $patient->phone; ?> 

</span>

</li>

for the patient we get the patient phone number from DB. i want to hyperlink that with https://wa.me/94'phone'. How can I do that? in front end when I click on patient phone number I want to open the whatsapp web via this url + phone (https://wa.me/94phone)

source https://stackoverflow.com/questions/73964530/how-to-add-whatapp-chat-in-new-window-in-a-php-application