After upgrading to PHP 8.2 or 8.3, I am seeing deprecated function warnings. How do I fix them?

PHP 8.2+ has removed or deprecated many old functions. You should update your code instead of hiding errors.
Temporary fix (not recommended for production):

error_reporting(E_ALL & ~E_DEPRECATED & ~E_NOTICE);
Best practice:
Replace deprecated functions (for example, replace each() with foreach).