PHP 8.1 INTERNALS UPGRADE NOTES

1. Internal API changes

2. Build system changes

3. Module changes
  a. ext/hash

========================
1. Internal API changes
========================

========================
2. Build system changes
========================

========================
3. Module changes
========================

  a. ext/hash
    - The init signatures are extended with an additional `HashTable*`
      argument. The passed HT is to contain the algorithm specific
      configuration. If the an algorithm doesn't make use of any
      additional configuration, the argument is to be marked with
      ZEND_ATTRIBUTE_UNUSED.