supported-php-features.md

Supported PHP features

All packages in this monorepo require PHP 8.1 for development, but contain only PHP code that can be transpiled to PHP 7.2 for production.

The list of supported PHP features is the following:

PHP Version	Features
7.2	Everything
7.3	Reference assignments in list()/array destructuring => [&$a, [$b, &$c]] = $d Except inside foreach (#4376) Flexible Heredoc and Nowdoc syntax Trailing commas in functions calls set(raw)cookie accepts $option argument Functions: array_key_first array_key_last hrtime is_countable Exceptions: JsonException
7.4	Typed properties Arrow functions Null coalescing assignment operator => ??= Unpacking inside arrays => $nums = [3, 4]; $merged = [1, 2, ...$nums, 5]; Numeric literal separator => 1_000_000 strip_tags() with array of tag names => strip_tags($str, ['a', 'p']) covariant return types and contravariant param types Functions: get_mangled_object_vars mb_str_split password_algos
8.0	Union types mixed pseudo type static return type ::class magic constant on objects match expressions catch exceptions only by type Null-safe operator Class constructor property promotion Trailing commas in parameter lists and closure use lists Interfaces: Stringable Classes: ValueError UnhandledMatchError Constants: FILTER_VALIDATE_BOOL Functions: fdiv get_debug_type preg_last_error_msg str_contains str_starts_with str_ends_with get_resource_id
8.1	Readonly properties First-class Callable Syntax New in initializers Pure Intersection Types Never return type Final class constants Array unpacking support for string-keyed arrays Functions: array_is_list