wp-jalali is not working on PHP 8.0

[AmirMehrabi]

Description

When I tried to activate wp-jalali on a wordpress running on PHP 8.0, I encountered a bunch of issues related to syntax change in PHP.

Screenshots

Here's some of those issues that need fixing:

To Reproduce

1) Install wp-jalali on a wordpress running on PHP 8.0 2) Navigate to "Plugins", and Activate wp-jalali

Tasks

• [x] List all of the code blocks that needs fixing
• [x] Update date.php with the new syntax changes
• [x] Activate and test the plugin

[AmirMehrabi]

I'm more than happy to help on this issue if it's alright with you guys.