Showing error “Function create_function() is deprecated”

we are getting a error after updating a php version to 7.2

Deprecated: Function create_function() is deprecated in
/customers/3/6/9/vakantiewoning-in-zuid-frankrijk.be/httpd.www/wp-content/themes/Tigerdesign/inc/init.php
on line 22

Warning: session_start(): Cannot start session when headers already
sent in
/customers/3/6/9/vakantiewoning-in-zuid-frankrijk.be/httpd.www/wp-content/plugins/unyson/framework/includes/hooks.php
on line 258

Notice: woocommerce_get_page_id is deprecated since version 3.0! Use
wc_get_page_id instead. in
/customers/3/6/9/vakantiewoning-in-zuid-frankrijk.be/httpd.www/wp-includes/functions.php
on line 3888

Notice: WC_Cart::get_cart_url is deprecated since version 2.5! Use
wc_get_cart_url instead. in
/customers/3/6/9/vakantiewoning-in-zuid-frankrijk.be/httpd.www/wp-includes/functions.php
on line 3888

Problem lies in your theme. It’s not compatible with PHP 7.2.

In this version the create_function is deprecated and you should use Anonymous Functions instead.

So for example instead of something like this:

$callback = create_function('', 'echo "'.str_replace('"', '\"', $section['desc']).'";');

You should use this:

$callback = function() {
    echo str_replace('"', '\"', $section['desc']);
};