Add missing ssh2_* signatures

[VincentLanglet]

Cf https://www.php.net/manual/en/function.ssh2-forward-accept.php
and https://www.php.net/manual/en/function.ssh2-forward-listen.php
and https://www.php.net/manual/en/function.ssh2-poll.php
and https://www.php.net/manual/en/function.ssh2-send-eof.php

[ondrejmirtes]

I don't think we need this? https://phpstan.org/r/16bc844a-19ef-458e-a77a-ef78aed7cf0f

[VincentLanglet]

I don't think we need this? phpstan.org/r/16bc844a-19ef-458e-a77a-ef78aed7cf0f

The definition seems really wrong:
https://phpstan.org/r/90b89c62-07b7-4a91-9d7f-609c59bf50ca

• Function ssh2_forward_accept invoked with 1 parameter, 0 required. => ssh2_forward_accept require 1 param
• Function ssh2_forward_listen invoked with 2 parameters, 0 required. => 2 param should be required
• ssh2_forward_accept, ssh2_forward_listen and ssh2_poll are returning mixed for phpstan when it should be resource|false
• ssh2_poll are returning mixed for phpstan when it should be int

I opened the PR on phpstorm to fix this JetBrains/phpstorm-stubs#1758

But I'm not sure to understand how phpstan works. I thought

• It used phpstorm-stubs on PHP 8+
• It use the functionMap on PHP 7.4-

So I opened the PR to fix this on PHP 7.4- ; but it seems like the phpstorm-stubs are also already used on Php 7.4- (?)

[ondrejmirtes]

phpstorm-stubs is always used.

php-8-stubs is only used on PHP 8+ (hence the name).

When an error message says "Function ssh2_forward_accept invoked with 1 parameter, 0 required.", it means PHPStan knows the function, but it has wrong signature. Therefore diff ADDING an entry to functionMap.php is suspicious.

I'd prefer waiting for phpstorm-stubs fix to be merged.