Fix GH-7826: Inconsistent argument name in hash_hmac_file and hash_file

Like `hash_file()`, `hash_hmac_file()` expects a filename, and not some
string data. Fixing this now, constitutes

Fix GH-7826: Inconsistent argument name in hash_hmac_file and hash_file

Like `hash_file()`, `hash_hmac_file()` expects a filename, and not some
string data. Fixing this now, constitutes a (hopefully small) BC break
though.

Closes GH-7828.

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Fix GH-7759: Incorrect return types for hash() and hash_hmac()

`hash()` and `hash_hmac()` never return `false`; only `hash_file()` and
`hash_hmac_file()` return `false` in case the data

Fix GH-7759: Incorrect return types for hash() and hash_hmac()

`hash()` and `hash_hmac()` never return `false`; only `hash_file()` and
`hash_hmac_file()` return `false` in case the data cannot be read.

Closes GH-7760.

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Update ext/spl parameter names

Closes GH-6284.

Improve parameter names in ext/hash and ext/openssl

Closes GH-6156

Display string default values in stubs more uniformly

Settling on using quoted string

Fix ZPP for mhash()

Closes GH-5985

Add a few missing parameter types in stubs

Related to GH-5627

Make HashContexts serializable.

* Modify php_hash_ops to contain the algorithm name and
serialize and unserialize methods.

* Implement __serialize and __unserialize magic meth

Make HashContexts serializable.

* Modify php_hash_ops to contain the algorithm name and
serialize and unserialize methods.

* Implement __serialize and __unserialize magic methods on
HashContext.

Note that serialized HashContexts are not necessarily portable
between PHP versions or from architecture to architecture.
(Most are, though Keccak and slow SHA3s are not.)

An exception is thrown when an unsupported serialization is
attempted.

Because of security concerns, HASH_HMAC contexts are not
currently serializable; attempting to serialize one throws
an exception.

Serialization exposes the state of HashContext memory, so ensure
that memory is zeroed before use by allocating it with a new
php_hash_alloc_context function. Performance impact is
negligible.

Some hash internal states have logical pointers into a buffer,
or sponge, that absorbs input provided in bytes rather than
chunks. The unserialize functions for these hash functions
must validate that the logical pointers are all within bounds,
lest future hash operations cause out-of-bounds memory accesses.

* Adler32, CRC32, FNV, joaat: simple state, no buffer positions
* Gost, MD2, SHA3, Snefru, Tiger, Whirlpool: buffer positions
must be validated
* MD4, MD5, SHA1, SHA2, haval, ripemd: buffer positions encoded
bitwise, forced to within bounds on use; no need to validate

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Fix some final classes in stubs

Fix UNKNOWN default values in various extensions

Closes GH-5514

Generate functions entries from stubs for another set of extensions

Closes GH-5351

Fix smaller issues with stubs

GH-5025

Add union return types for function stubs

Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime

Fix required number of arguments in stubs

* get_parent_class() argument is optional
* Mark array_filter() $callback as optional
* The $base of gmp_strval() is optional
* DateTime constructor also accepts zero arguments
* hash_update_file() stream context is optional
* xmlwriter_write_dtd_entity() $isparam argument is optional

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Add stubs for ext-hash