PHP Manual: Dummy function (Phar::setStub is not valid for PharData)

public true PharData::setStub(resourcestring $stub, int $length = -1)

Non-executable tar/zip archives cannot have a stub, so this method simply throws an exception.

stub: Formally, a string or an open stream handle to use as the executable stub for this phar archive. This parameter is ignored.
length: stub in bytes. This parameter is ignored.

Always returns true.

Throws PharException on all method calls

Version	Description
8.4.0	The return type is `true` now; previously, it was bool.

PharData::setStub