The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.
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A major release series such as
4.X MUST be be supported for at least one year after the initial stable version (
5.0.0) of the next major release series (
5.X) is released.
The support for a minor release series such as
4.0 SHOULD end when a new minor version (such as
4.1.0) or a new major version (such as
5.0.0) is released.
A release series of PHPUnit that is actively supported MUST be compatible with all versions of PHP that are actively supported by the PHP project.
The minimum required version of PHP MAY only be bumped in a new major release of PHPUnit.