Fix miscellaneous typos in docs and error messages

Closes GH-4863.

Optimize array_slice for packed arrays with large offsets

If the offset is 100000, and there are no gaps in the packed/unpacked array,
then advance the pointer once by 100000,
instea

Optimize array_slice for packed arrays with large offsets

If the offset is 100000, and there are no gaps in the packed/unpacked array,
then advance the pointer once by 100000,
instead of looping and skipping 100000 times.

Add a new test of array_slice handling unset offsets.

Closes GH-4860.

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Allow array_splice() length to be null

Document the changes to substr functions

Fix and undeprecate ReflectionType::__toString()

Add deprecated _ZendTestClass::__toString() method to preserve
an existing test.

ReflectionType::__toString() will now return a

Fix and undeprecate ReflectionType::__toString()

Add deprecated _ZendTestClass::__toString() method to preserve
an existing test.

ReflectionType::__toString() will now return a complete
representation of the type, as it should have originally. Users
that relied on nullability being absent should have been pushed
to ReflectionNamedType::getName() by the deprecation of
ReflectionType::__toString() in PHP 7.1 / PHP 7.4.

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Promote "Cannot use parent" to fatal error

Add fdiv() function

The fdiv() function is part of the fmod() / intdiv() family. It
implements a floating-point division with IEEE-754 semantics.
That is, division by zero is conside

Add fdiv() function

The fdiv() function is part of the fmod() / intdiv() family. It
implements a floating-point division with IEEE-754 semantics.
That is, division by zero is considered well-defined and does not
trigger any kind of diagnostic. Instead one of INF, -INF or NAN
will be returned, depending on the case.

This is in preparation for throwing DivisionByZeroError from the
standard division operator.

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Use clean shutdown on uncaught exception

Replace "unexpected character" warning with ParseError

Closes GH-4767.

Fix #72374: remove_path strips first char of filename

Convert some notices to warnings

Part of https://wiki.php.net/rfc/engine_warnings.

Convert GD Resources to objects

Convert "Only arrays and Traversables can be unpacked" into Error

Promote write "use scalar as array" warning to Error

Convert "Illegal offset type" warnings to exceptions

Convert "cannot add element" warning to exception

Throw Error when writing property of non-object

This removes object auto-vivification support.

This also means that we can remove the corresponding special
handling for typed pr

Throw Error when writing property of non-object

This removes object auto-vivification support.

This also means that we can remove the corresponding special
handling for typed properites: We no longer need to check that a
property is convertible to stdClass if such a conversion might
take place indirectly due to a nested property write.

Additionally OBJ_W style operations now no longer modify the
object operand, and as such we no longer need to treat op1 as a
def in SSA form.

The next step would be to actually compile the whole LHS of OBJ_W
operations in R rather than W mode, but that causes issues with
SimpleXML, whose object handlers depend on the current compilation
structure.

Part of https://wiki.php.net/rfc/engine_warnings.

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Remove unused parameter

The `$use_include_path` parameter doesn't make sense for
`tidy_repair_string()`, and actually unused, so we remove it.

Remove unused parameter

Cf. <https://bugs.php.net/78579>.

Don't make argument nullable based on AST null initializer

Closes GH-4720.

Change XMLWriter resources to objects

While we generally prefer objects over resources for quite a while, the
procedural XMLWriter API still uses resources, although there is
already

Change XMLWriter resources to objects

While we generally prefer objects over resources for quite a while, the
procedural XMLWriter API still uses resources, although there is
already an object-oriented API which uses objects. This dichotomy
makes no sense, slightly complicates the implementation, and doesn't
allow a stepwise migration to the object-oriented API, which might be
desired. Thus we completely drop the XMLWriter resources in favor of
XMLWriter objects.

We consider the minor BC break acceptable for a major version, since
only explicit type checks (`is_resource()`, `gettype()` etc.) need to
be adapted.

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Upgrading notes for removed ext/dom classes.

upgrading notes for ValueError/zend_value_error()

Enable display_startup_errors by default

Make error_reporting=E_ALL the default