Deprecate IAP functions on objects

Deprecate use of key(), current(), next(), prev(), reset() and
end() on objects. Cast the object to array first.

Part of https://wiki.php.net/

Deprecate IAP functions on objects

Deprecate use of key(), current(), next(), prev(), reset() and
end() on objects. Cast the object to array first.

Part of https://wiki.php.net/rfc/deprecations_php_8_1.

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