Add more specific array return type hints for various extensions - part 6 (#7474)

Not serializable flag permeation

Improve class entry generation

Related to GH-6701

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

Closes GH-6696

socket_create_pair() can no longer return NULL

Closes GH-6592.

Update ext/sockets parameter names

Also change $max_length to $length in a number of filesystem APIs,
where our usage was inconsistent.

Closes GH-6276.

Display types in stubs more uniformly

In preparation for generating method signatures for the manual.

This change gets rid of bogus false|null return types, a few unnecessary traili

Display types in stubs more uniformly

In preparation for generating method signatures for the manual.

This change gets rid of bogus false|null return types, a few unnecessary trailing backslashes, and settles on using ? when possible for nullable types.

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Fix UNKNOWN default values in various extensions

Closes GH-6075

Add more argument types to stubs

Closes GH-5943

Convert resources to objects in ext/sockets

Closes GH-5900.

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necess

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necessary.

This ensures that release artifacts will never try to regenerate
stubs and thus fetch PHP-Parser, as long as you do not modify any
files.

Closes GH-5739.

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Use UNKNOWN default for socket_connect()

Specifying the port is mandatory for INET sockets.

Fix socket_write() default value

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal function

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal functions.

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

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Generate function entries for another batch of extensions

Closes GH-5352

Add stubs for aliases

Closes GH-5187

Add union return types for function stubs

Add stubs for ext-sockets