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.

Merge branch 'PHP-7.4'

* PHP-7.4:
Switch back to FREE_UNFETCHED_OP_DATA

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.

Merge branch 'PHP-7.4'

* PHP-7.4:
Fix bug #79599 in a different way
Revert "Fixed bug #97599 (coredump in set_error_handler)"

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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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

Support catching exceptions without capturing them to variables

RFC: https://wiki.php.net/rfc/non-capturing_catches

Closes GH-5345.

Merge branch 'PHP-7.4'

* PHP-7.4:
Respect typed references in catch assignment

Respect typed references in catch assignment

I decided to null out EG(exception) early here, which means only
the exception from the dtor / ref assign is preserved, and the
previous

Respect typed references in catch assignment

I decided to null out EG(exception) early here, which means only
the exception from the dtor / ref assign is preserved, and the
previous exception is not chained in. This is more robust, and
I don't think this situation is common enough to be bothered about
the precise behavior.

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Clarify ZEND_CATCH code

UNDEF the opcode result instead of addref'ing the exception.

Improve error messages for invalid property access

Closes GH-5446
Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Use zend_zval_type_name() API where possible

Rather than zend_get_type_by_const(Z_TYPE_P()).

Rename zend_zval_get_type() API

We have a bunch of APIs for getting type names and it's sometimes
hard to keep them apart ... make it clear that this is the one
you definitely do not

Rename zend_zval_get_type() API

We have a bunch of APIs for getting type names and it's sometimes
hard to keep them apart ... make it clear that this is the one
you definitely do not want to use.

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zend_timeout is not a signal handler function

The 'int dummy' parameter to this function makes it appear that it was intended as a
signal handler, but it is not being used as such. So re

zend_timeout is not a signal handler function

The 'int dummy' parameter to this function makes it appear that it was intended as a
signal handler, but it is not being used as such. So remove the redundant parameter.

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Speed up ZEND_SWITCH_STRING/ZEND_SWITCH_LONG for wrong type

This has the minor benefit of avoiding loading the address of the
jump table when the expression for the switch isn't a string

Speed up ZEND_SWITCH_STRING/ZEND_SWITCH_LONG for wrong type

This has the minor benefit of avoiding loading the address of the
jump table when the expression for the switch isn't a string/long.
gcc doesn't seem to optimize that.

The previous function body is the original implementation: ad8652818a5

```
// Before: 0.267s, after: 0.265s
function test_switch($x) {
for ($i = 0; $i < 10000000; $i++) {
switch ($x) {
case 'a':
case 'b':
echo "i=$i\n";
}
}
}
test_switch(null);
```

Closes GH-5419

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Early return if variadic type check fails

Don't check all the remaining arguments after one check failed.
I don't think this makes an observable behavior difference,
because we alrea

Early return if variadic type check fails

Don't check all the remaining arguments after one check failed.
I don't think this makes an observable behavior difference,
because we already suppress duplicate exceptions in argument
type error reporting.

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Merge branch 'PHP-7.4'

* PHP-7.4:
zend_timeout() may access EX(opline)