Add support for generating MAY_BE_ARRAY_OF_REF func info flag (#7416)

Generate Zend, ext/spl and ext/json optimizer func info from stubs

Closes GH-7397

Generate ext/spl class entries from stubs

Closes GH-6709

Update ext/spl parameter names

Closes GH-6284.

Improve a few parameter names in ext/spl

Use the same names which are used by zend functions.

Fix bug #65006

The "callable name" may be the same for multiple distinct callables.
The code already worked around this for the case of instance methods,
but there are other cases in

Fix bug #65006

The "callable name" may be the same for multiple distinct callables.
The code already worked around this for the case of instance methods,
but there are other cases in which callable names clash, such as
the use of self:: reported in the referenced bug.

Rather than trying to generate a unique name for callables, compare
the content of the alfi structures. This is less efficient if there
are many autoload functions, but autoload *registration* does not
need to be particularly efficient.

As a side-effect, this no longer permits unregistering non-callables.

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Cleanup SPL autoload implementation

Replace EG(autoload_func) with a C level zend_autoload hook.
This avoids having to do one indirection through PHP function
calls. The need for EG(

Cleanup SPL autoload implementation

Replace EG(autoload_func) with a C level zend_autoload hook.
This avoids having to do one indirection through PHP function
calls. The need for EG(autoload_func) was a leftover from the
__autoload() implementation.

Additionally, drop special-casing of spl_autoload(), and instead
register it just like any other autoloading function. This fixes
bug #71236 as a side-effect.

Finally, change spl_autoload_functions() to always return an array.
The distinction between false and an empty array no longer makes
sense here.

Closes GH-5696.

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Use ZPP callable check for spl_autoload_register.

This makes it always throw a TypeError, moreover this makes the
error message consistent.

Added a warning mentioning that the s

Use ZPP callable check for spl_autoload_register.

This makes it always throw a TypeError, moreover this makes the
error message consistent.

Added a warning mentioning that the second parameter is now ignored
when passed false.

Closes GH-5301

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Fix UNKNOWN default values in ext/spl

Generate methods entries from stubs for ext/spl

Closes GH-5458

Mark spl_autoload_register function arg as UNKNOWN

Not passing any parameters to this function has magic behavior.

Add some stubs for SPL

Closes GH-5245

Add funcinfo for spl global functions

This assumes that `iterator_*` will now always throw or abort on failure.

Also, move #include _arginfo.h directive to the top of the file - vir

Add funcinfo for spl global functions

This assumes that `iterator_*` will now always throw or abort on failure.

Also, move #include _arginfo.h directive to the top of the file - virtually all
other files put it there, and developers may base code on basic_functions.c.

Closes GH-4968

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