The three dots in trim(...) make a callable out of a function, that was already in, so seem best to re-use that syntax, at least for now. [1] As for the partia

The three dots in trim(...) make a callable out of a function, that was already in, so seem best to re-use that syntax, at least for now. [1] As for the partial function application, there is already an RFC to add that, but it's not decided on as of now. [2] 1: https://www.php.net/manual/en/functions.first_class_callable_syntax.php https://www.php.net/manual/en/functions.first_class_callable... 2: https://wiki.php.net/rfc/partial_function_application_v2 https://wiki.php.net/rfc/partial_function_application_v2