Merge branch 'PHP-8.0'

* PHP-8.0:
Mark PDO::setAttribute() $value as mixed

Mark PDO::setAttribute() $value as mixed

For consistency with PDOStatement::setAttribute(). Attribute values
can for example also be bool.

This is backwards-compatible, as mixed

Mark PDO::setAttribute() $value as mixed

For consistency with PDOStatement::setAttribute(). Attribute values
can for example also be bool.

This is backwards-compatible, as mixed is the same as no type for
parameter variance.

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Use single line phpdoc in stubs where possible

Not serializable flag permeation

Declare tentative return types for ext/pdo

Closes GH-6996

Generate class entries from stubs for oci8, odbc, openssl, pcntl, pdo, pgsql

Closes GH-6691

Update PDO parameter names

Followup to previous changes:
* Use camel case, as PDO uses a camel case OO API.
* Use &$var instead of &$bind_var or &$param.
* Use $column instead

Update PDO parameter names

Followup to previous changes:
* Use camel case, as PDO uses a camel case OO API.
* Use &$var instead of &$bind_var or &$param.
* Use $column instead of $index. We have cases (both inside PDO
and in other DB exts) where columns can also be represented as
strings, so $column is the safer generic name.

Closes GH-6272.

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Update PDO parameters for named arguments.

Closes GH-6220

Add more precise type info for stubs

Closes GH-6005

Add another round of missing parameter types to stubs

Closes GH-5950

Avoid UNKNOWN default in PDO::query()

Use zpp for PDO fetch mode

Also changing the function signatures to accept variadic args
for the fetch params. If we're already breaking Doctrine anyway,
we may as well do it properl

Use zpp for PDO fetch mode

Also changing the function signatures to accept variadic args
for the fetch params. If we're already breaking Doctrine anyway,
we may as well do it properly.

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Annotate internal functions with the mixed type

Closes GH-5618

Remove PDO::dbh_constructor()

Generate method entries from stubs for curl, ffi, pdo, phar

Closes GH-5375

Do not include the same stub multiple times

Closes GH-5322