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For WAY too many YEARS now, the documentation of many methods of many reflection classes contains this notice:
"Warning This function is currently not documented; only its argument list is available."
This is completely unacceptable. Bug #41574 is 11 years old, it has seen no activity other than a reply from someone @php.net to the effect of "we are working on it" (which turned out to be a LIE), and has been closed as "not a bug". I am creating this report on the technicality that #41574 refers specifically to the \Reflector class while the issue also pertains to many other reflection classes.
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I'm not the most versed person with the Reflection API.
However, if you have any knowledge you can always document the functions/classes
using the online PHP documentation editor at https://edit.php.net and submit a (or multiple) patches.