Returns FALSE for an internal function (when isInternal() returns TRUE, e.g. for 'strlen').
(PHP 5 >= 5.2.0, PHP 7, PHP 8)
ReflectionFunctionAbstract::getFileName — Gets file name
Gets the file name from a user-defined function.
У цієї функції немає параметрів.
Returns the filename of the file in which the function has been defined.
If the class is defined in the PHP core or in a PHP extension, false
is returned.
Returns FALSE for an internal function (when isInternal() returns TRUE, e.g. for 'strlen').