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PHP 8.1

Released 25 November 2021.

Major new features:

enums

readonly properties

first-class callable syntax, eg. strlen(...)

fibers

the never return type, and pure intersection types

Minor new features:

new in initializers, eg. function f($x = new Foo())

final class constants

array_is_list()

explicit octal integer literal notation, eg. 0o16