Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
Fix the return type of imagecolorexactalpha()
String default values are enclosed in quotes rather than apostrophes

Fix the return type of imagecolorexactalpha()

Generate optimizer func info from stubs for ext/gd and ext/pgsql (#7408)

Merge branch 'PHP-8.0'

* PHP-8.0:
imagecolorsforindex() cannot return false

imagecolorsforindex() cannot return false

Not serializable flag permeation

Add avif support to ext/gd

This backports avif support from upstream libgd into bundled libgd
and exposes the functionality through new imagecreatefromavif()
and imageavif() function

Add avif support to ext/gd

This backports avif support from upstream libgd into bundled libgd
and exposes the functionality through new imagecreatefromavif()
and imageavif() functions.

Closes GH-7026.

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

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Merge branch 'PHP-8.0'

* PHP-8.0:
Fix some imagecolor*() return types

Fix some imagecolor*() return types

These functions either return always a valid color, or `-1` on failure,
but never `false`.

Closes GH-7041.

Merge branch 'PHP-8.0'

* Fix imagesetclip() parameter names

Fix imagesetclip() parameter names

Closes GH-7035

Merge branch 'PHP-8.0'

* PHP-8.0:
imagecolortransparent() cannot return null

imagecolortransparent() cannot return null

Merge branch 'PHP-8.0'

* PHP-8.0:
Return bool from imageinterlace()

Return bool from imageinterlace()

The function accepts a bool since PHP 8.0, so it should also return
a bool to keep things consistent.

Furthermore a null return from this funct

Return bool from imageinterlace()

The function accepts a bool since PHP 8.0, so it should also return
a bool to keep things consistent.

Furthermore a null return from this functions is not possible.

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Merge branch 'PHP-8.0'

* PHP-8.0:
Properly check imagegd() signature
Make imagegd $file parameter nullable

Make imagegd $file parameter nullable

It is explicitly documented to be nullable, and this matches other
functions like imagepng. It is also documented to accept a stream,
which it c

Make imagegd $file parameter nullable

It is explicitly documented to be nullable, and this matches other
functions like imagepng. It is also documented to accept a stream,
which it currently does not...

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Implicitly enable function entry generation when class entry generation is enabled

Closes GH-6675

Generate class entries from stubs for another batch of extensions

Closes GH-6669

Convert gdFont from resource to object

Update ext/gd parameter names

Closes GH-6308.

Fix UNKNOWN default values in various extensions

Closes GH-6075

Add all the missing parameter types to stubs

Closes GH-5955

Add a few missing parameter types in stubs

Related to GH-5627

Fix UNKNOWN default values in ext/mbstring and ext/gd

Closes GH-5598