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<?php class Router { public function dispatch() { return var_dump(is_callable('Router::handleHuman')); } private function handleHuman() { echo 'Human Handled'; } } $router = new Router; $router->dispatch(); var_dump(class_exists('Router'));
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(true) bool(true)

preferences:
153.61 ms | 404 KiB | 180 Q