ReflectionFunctionAbstract::getExtension Gets extension info &reftitle.description; public ReflectionExtensionnullReflectionFunctionAbstract::getExtension Get the extension information of a function. &reftitle.parameters; &no.function.parameters; &reftitle.returnvalues; The extension information, as a ReflectionExtension object, or &null; for user-defined functions. &reftitle.seealso; ReflectionFunctionAbstract::getExtensionName