PHP: Calling another class function with namespace? - php

Question

I'm having a few problems calling a function from a string, as its a lot more complicated than just calling a function, I need to do it inside another class, with another namespace.
I dispatch my routes using this method, I am using TreeRoute package on GitHub.
public function dispatch() {
$uri = substr($_SERVER['REQUEST_URI'], strlen(implode('/', array_slice(explode('/', $_SERVER['SCRIPT_NAME']), 0, -1)) . '/'));
$method = $_SERVER['REQUEST_METHOD'];
$result = $this->router->dispatch($method, $uri);
if (!isset($result['error'])) {
$handler = $result['handler'];
$params = $result['params'];
// TODO: Call the handler here, but how?
}
else {
switch ($result['error']['code']) {
case 404 :
echo 'Not found handler here';
break;
case 405 :
echo 'Method not allowed handler here';
$allowedMethods = $result['allowed'];
if ($method == 'OPTIONS') {
// OPTIONS method handler here
}
break;
}
}
}
I register routes like this:
public function __construct() {
$this->router = new \TreeRoute\Router();
}
public function setRoutes() {
$this->router->addRoute('GET', '/test', 'App/Controllers/SomeController/test');
}
What I want to do is call function 'test' in class 'SomeController', now 'SomeController has a namespace of 'App\Controllers'.
I looked into calluserfunc but I couldn't work out how to do it with my string format and with a namespace, can someone help me out?
http://php.net/manual/en/function.call-user-func.php

Answer 1

You can call call_user_func with full class path like this:
call_user_func('App\Controllers\SomeController::test', $arg1, $arg2)
// or
call_user_func(['App\Controllers\SomeController', 'test'], $arg1, $arg2)
// or better
use App\Controllers\SomeController;
call_user_func([SomeController::class, 'test'], $arg1, $args2);

Answer 2

I believe this will do the job
if (!isset($result['error'])) {
$handler = $result['handler'];
$params = $result['params'];
$method = substr( strrchr($handler, '/'), 1 ); // get the method's name from $handler string
$class = substr($handler, 0, -strlen($method)-1); // get the class name from $handler string
$class = str_replace('/', '\\', $class); // change slashes for anti-slashes
// then choose one of those :
// if your methods are static :
call_user_func_array([$class, $method], $params);
// otherwise :
(new $class)->{$method}(...$params); // needs php 7
}