Fix memory leak on unknown named param

Fix memory leak when yielding from non-iterable

Fix refcounting

Fix #79979: passing value to by-ref param via CUFA crashes

If a by-val send is not allowed, we must not do so. Instead we wrap
the value in a temporary reference.

Closes GH-6000

Fixed use-after-free introduced by aed1f785159e7c9e81da8f2e2e06df9a6ee0d809

micro-optimization

SAVE_OPLINE in NULL_HANDLER

Let's avoid crashing before the nice error message gets printed...

Fix nullsafe operator on reference

Dereference the value before checking the type. As the happy path
necessarily has to check for references, I'm not bothering to
delay the compariso

Fix nullsafe operator on reference

Dereference the value before checking the type. As the happy path
necessarily has to check for references, I'm not bothering to
delay the comparison.

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Fixed bug #79947

Move the FREE_OP for op_data out of the zend_binary_assign_op_dim_slow()
slow path, so it can be used by the other error path as well. This
makes ASSIGN_DIM_OP struc

Fixed bug #79947

Move the FREE_OP for op_data out of the zend_binary_assign_op_dim_slow()
slow path, so it can be used by the other error path as well. This
makes ASSIGN_DIM_OP structurally more similar to ASSIGN_DIM.

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Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument nam

Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument name. For now, it is looked up by linear scan and
runtime cached.
* This may leave UNDEF arguments on the stack. To avoid having
to deal with them in other places, a CHECK_UNDEF_ARGS opcode
is used to either replace them with defaults, or error.
* For variadic functions, EX(extra_named_params) are collected
and need to be freed based on ZEND_CALL_HAS_EXTRA_NAMED_PARAMS.

RFC: https://wiki.php.net/rfc/named_params

Closes GH-5357.

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Make check in RECV_VARIADIC more precise

Fetch arg_info only once (it's always the same one...) and check
ZEND_TYPE_IS_SET on it, rather than checking if *any* parameter
has a type.

Implement nullsafe ?-> operator

RFC: https://wiki.php.net/rfc/nullsafe_operator

Closes GH-5619.

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Fixed bug #79828

Review the usage of apostrophes in error messages

Closes GH-5590

Fixed bug #79818

Only destroy the variable directly before reassigning it. The
value could be read in the meantime.

Implement match expression

RFC: https://wiki.php.net/rfc/match_expression_v2

Closes GH-5371.

Remove FREE_UNFETCHED concept

In master normal FREE_OPs work like FREE_UNFETCHED_OP used to, so
there is no point in keeping this distinction anymore, it's just
confusing.

Switch back to FREE_UNFETCHED_OP_DATA

Some of the code paths leading to this do not fetch op data.
Hopefully this fixes the release build failure.

Fix bug #79599 in a different way

Move the emission of the undefined variable notice before the
array separation.

Assert exception set in HANDLE_EXCEPTION()

Some code paths were checking this manually, but we can turn this
into a general assertion to avoid surprises (functions returning
failure

Assert exception set in HANDLE_EXCEPTION()

Some code paths were checking this manually, but we can turn this
into a general assertion to avoid surprises (functions returning
failure without throwing).

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Remove #undefs from vm_gen

Possibly these were needed for VM_EXPORT, but they don't serve a
purpose now.

Fixed bug #79777

Make exit() unwind properly

exit() is now internally implemented by throwing an exception,
performing a normal stack unwind and a clean shutdown. This ensures
that no persistent reso

Make exit() unwind properly

exit() is now internally implemented by throwing an exception,
performing a normal stack unwind and a clean shutdown. This ensures
that no persistent resource leaks occur.

The exception is internal, cannot be caught and does not result in
the execution of finally blocks. This may be relaxed in the future.

Closes GH-5768.

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Change GC_COLLECTABLE flag into GC_NOT_COLLECTABLE to simplify GC_MAY_LEAK() check

Fix several mostly Windows related phpdbg bugs

* Properly initialize PHPDBG_G(watch_tmp)

Otherwise that may cause segfaults in ZTS builds.

* Deactivate potentially remain

Fix several mostly Windows related phpdbg bugs

* Properly initialize PHPDBG_G(watch_tmp)

Otherwise that may cause segfaults in ZTS builds.

* Deactivate potentially remaining watchpoints after REPL

Otherwise the memory could still be protected, resulting in segfaults
during shutdown.

* NULL zend_handlers_table after freeing

As of commit 4130fe4[1], the `zend_handlers_table` is explicitly
freed in the `zend_vm_dtor()`. Since phpdbg (and maybe some other
SAPIs) may restart the engine afterwards, we have to make sure that
the table is also NULLed.

* Only set context option if there is a context

In other words, we must not follow the null pointer.

* Cater to file handles without attached console

File handles do not necessarily have an attached console (for
instance, pipes do not), in which case `GetConsoleScreenBufferInfo()`
fails. In this case we set a default value (`40`) for lines like on
other systems.

[1] <http://git.php.net/?p=php-src.git;a=commit;h=4130fe437a5db7ead1444d3748bd0fbad9829cb2>

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