Slightly clean up cookies handling

Make the property always an array with an empty array default.
Properly separate the array on modification to compensate.

Make internal SoapServer/SoapClient state private

This was previously implicitly public due to the use of dynamic
properties. Make this internal state private.

If someone compla

Make internal SoapServer/SoapClient state private

This was previously implicitly public due to the use of dynamic
properties. Make this internal state private.

If someone complains, we can consider relaxing this to protected
or public on a case-by-case basis.

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Declare remaining SoapClient properties

Declare SoapFault properties

Declare some SoapClient properties

This is only a subset of all properties for now (those without
underscore).

Declare SoapHeader properties

Declare SoapServer::$service property

Declare SoapVar properties

Declare SoapParam properties

Declare tentative return types for ext/soap

Closes GH-7001

Generate class entries for snmp, soap, sockets, sodium, sqlite3, sysv*, tidy

Closes GH-6696

Accept null $location in SoapClient::__setLocation()

Currently an empty string is used to unset the location. Once
again, it makes more sense to use a null value for this purpose
(th

Accept null $location in SoapClient::__setLocation()

Currently an empty string is used to unset the location. Once
again, it makes more sense to use a null value for this purpose
(though the special behavior of empty strings is retained).

The code comment above the function also explicitly indicates
that null should be accepted, and the function does return null
rather than an empty string for the old location value (if it
is missing).

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Make SoapVar arguments nullable

$typeName, $typeNamespace, $nodeName and $nodeNamespace all
special-case the empty string and don't set the property entirely
in that case. It makes m

Make SoapVar arguments nullable

$typeName, $typeNamespace, $nodeName and $nodeNamespace all
special-case the empty string and don't set the property entirely
in that case. It makes more sense to use null to indicate absence
here (though of course the empty string behavior is retained).

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Update ext/soap parameter names

Closes GH-6300.

Accept bool in SoapClient::__doRequest

$one_way is a boolean argument.

Promote warnings to exceptions in ext/soap and ext/xmlwriter

Closes GH-5998

Add all the missing parameter types to stubs

Closes GH-5955

Add a bunch of missing argument types to stubs

Separate __call and __soapCall implementations

This is overly pedantic, but allows us to enable more arginfo
consistency checks.

Generate function entries from stubs

Converts ext/pcntl, ext/simplexml, ext/snmp, ext/soap, ext/sqlite3.
Closes GH-5421

Fix nullable types in PHPDoc

Add missing visibility modifiers in stubs

Define Stringable with __toString():string method

Convert soap functions arginfo to php stubs

We alos make the last parameter of `SoapClient::__setCookie()` and
`SoapFault::__construct()` properly nullable.