<?php
spl_autoload_register(function ($class) {
    $class = str_replace('\\', '/', $class);
    $file = $class . '.php';
    if (is_file($file)) {
        require_once($file);
    }
});

use vendor\container;
use vendor\request;

container::bind('vendor\\request', function () {
    return new request();
});

$request    = container::get('vendor\\request');
$s          = explode('/', $request->get('s'));
$controller = '\\controller\\' . ucfirst($s[1]) . 'Controller';
$action     = lcfirst($s[2]) . 'Action';
$instance   = new $controller();
try {
    $reflect = new ReflectionMethod($instance, $action);
} catch (ReflectionException $e) {
}
$params = $reflect->getParameters();
$args   = [];
foreach ($params as $param) {
    $reflectionName = $param->getName();
    $reflectionType = $param->getType();
    $type_name      = $reflectionType->getName();
    if (container::has($type_name)) {
        $args[] = new $type_name();
    } else {
        $args[] = $request->get($reflectionName);
    }
}
try {
    return $reflect->invokeArgs($instance, $args);
} catch (ReflectionException $e) {
}

注入request

<?php

namespace controller;


use vendor\request;

class UserController
{
    public function showAction(request $request, string $b)
    {
        echo $request->get("a");
        echo "<br />";
        echo $b;
    }
}