PHP 8.0 language support tracking issue

[jakubmisek]

Configuration:

• <LangVersion> allows to set 8.0, latest refers to 8.0, default 7.4

Language features:

• Union types
  • syntax, mixed
  • type analysis, "null", nullability
  • runtime type check
• Attributes
  • new syntax
  • resolve CLR attributes as before
  • store metadata
  • PHP reflection
• Constructor properties (0ea8da8, c8f10e8)
• static return type
• match expression (https://wiki.php.net/rfc/match_expression_v2)
• Nullsafe operator with short-circuit evaluation (https://wiki.php.net/rfc/nullsafe_operator)
• Named arguments (https://wiki.php.net/rfc/named_params)
  • call_user_func*() and internal PhpRoutine.Invoke(Context, PhpArray) to support named arguments
  • use in ReflectionAttribute::newInstance() accordingly
  • Variadic functions and argument unpacking
  • error when calling a virtual method that changes the parameter name of its parent
• mixed type
• Throw expression
• Allowing ::class on objects
• Non-capturing catches
• Trailing comma in parameter lists
• Stringable interface (32d72d4)

Functions:

see for latest release status https://docs.peachpie.io/compatibility-status/

• WeakMap
• Attribute
• str_contains, str_starts_with, str_ends_with
• fdiv, get_resource_id
• get_debug_type
• preg_last_error_msg
• PhpToken
• resource to Object migration (CurlHandle, CurlMultiHandle, CurlShareHandle, GdImage, Socket, AddressInfo, openssl, XMLWriter, XMLParser)

Others:

• Calling non-static class methods statically result in a fatal error
• strict magic method signature
• Locale-independent float to string casting (invariant, we can ignore current context finally!)