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<?php enum CacheHit { case CacheHit; } function foo(string $foo): string|CacheHit { static $data = []; if (isset($data[$foo])) { return CacheHit::CacheHit; } $data[$foo] = true; return $foo; } var_dump(foo('foo')); var_dump(foo('bar')); var_dump(foo('bar'));
Output for git.master, git.master_jit
string(3) "foo" string(3) "bar" enum(CacheHit::CacheHit)

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