Drop various unused macros/APIs

Also convert_libmagic_pattern() to return a zend_string*

Closes GH-6029

Fix memory leak on unknown named param in iterator unpack

Fix passing of undef var to named arg

This needs to use the previously computed argument target.

Fix memory leak on unknown named param

Merge branch 'PHP-7.4'

* PHP-7.4:
Fix memory leak when yielding from non-iterable

Merge branch 'PHP-7.3' into PHP-7.4

* PHP-7.3:
Fix memory leak when yielding from non-iterable

Fix memory leak when yielding from non-iterable

Merge branch 'PHP-7.4'

* PHP-7.4:
Fix refcounting

Fix refcounting

Merge branch 'PHP-7.4' into master

* PHP-7.4:
Fix #79979: passing value to by-ref param via CUFA crashes

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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Merge branch 'PHP-7.4'

* PHP-7.4:
Fixed bug #79947

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.