PHP 8.1.15 Released!

Literal types

Literal types are type which not only check the type of a value but also the value itself. PHP has support for two literal types: false as of PHP 8.0.0, and true as of PHP 8.2.0.

Warning

Prior to PHP 8.2.0 the false type could only be used as part of a union type.

Note: It is not possible to define custom literal types. Consider using an enumerations instead.

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