Undefined variable $msg_to_display , “roles” bool, undefined, PHP 8.1

Just upgraded our site to PHP 8.1 and getting some error messages loading various pages when this plugin is activated:

Undefined variable $msg_to_display at wp-content/plugins/discount-with-first-purchase-for-woocommerce/Front/plgfyqdp_main_front.php:1119)

If I change the line from $$msg_to_display=''; to $msg_to_display=''; it works. Not sure if this is the best fix.

Was also getting
Attempt to read property \"roles\" on bool at wp-content/plugins/discount-with-first-purchase-for-woocommerce/Front/plgfyqdp_main_front.php:966)
and
Attempt to read property \"roles\" on bool at wp-content/plugins/discount-with-first-purchase-for-woocommerce/Front/plgfyqdp_main_front.php:1127

Fixed by changing from:
$user_roles=$user_meta->roles;
to

if (isset($user_meta->roles)) {
  $user_roles=$user_meta->roles;
} else {
  $user_roles = [];
}

Also getting:
Undefined array key \"applied_on\" at wp-content/plugins/discount-with-first-purchase-for-woocommerce/Front/plgfyqdp_main_front.php:1047
and
Undefined array key \"applied_on\" at wp-content/plugins/discount-with-first-purchase-for-woocommerce/Front/plgfyqdp_main_front.php:448

Fixed by changing from:
} else if ('whole' == $value['applied_on']) {
to
} else if (isset($value['applied_on']) && 'whole' == $value['applied_on']) {

• This topic was modified 1 year, 12 months ago by emboldtyler.
• This topic was modified 1 year, 12 months ago by emboldtyler.
• This topic was modified 1 year, 12 months ago by emboldtyler.
• This topic was modified 1 year, 12 months ago by emboldtyler. Reason: Adding additional errors/fixes