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<?php $rf = new ReflectionFunction("get_class"); $rp = $rf->getParameters()[0]; var_dump($rp->getDefaultValueConstantName());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ReflectionException: Internal error: Failed to retrieve the default value in /in/BenkS:5 Stack trace: #0 /in/BenkS(5): ReflectionParameter->getDefaultValueConstantName() #1 {main} thrown in /in/BenkS on line 5
Process exited with code 255.

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