致命错误：未捕获的 TypeError：call_user_func()：参数 #1 ($callback) 必须是有效的回调

Question

我尝试使用php mvc，我该如何解决这个错误？

致命错误：未捕获的类型错误：call_user_func()：参数 #1 ($callback) 必须是有效回调，数组在 C:\xampp\htdocs\03_good\Router.php:53 中必须恰好有两个成员 堆栈跟踪：
#0 C:\xampp\htdocs\03_good\Router.php(53): call_user_func(Array, Object(app\Router))
#1 C:\xampp\htdocs\03_good\public\index.php(20): app\Router->resolve()
#2 {main} 在第 53 行的 C:\xampp\htdocs\03_good\Router.php 中抛出

这是我的Router：

<?php
/**
 * User: TheCodeholic
 * Date: 10/11/2020
 * Time: 10:05 AM
 */

namespace app;


/**
 * Class Router
 *
 * @author  Zura Sekhniashvili <zurasekhniashvili@gmail.com>
 * @package app
 */
class Router
{
    public array $getRoutes = [];
    public array $postRoutes = [];

    public ?Database $database = null;

    public function __construct(Database $database)
    {
        $this->database = $database;
    }

    public function get($url, $fn)
    {
        $this->getRoutes[$url] = $fn;
    }

    public function post($url, $fn)
    {
        $this->postRoutes[$url] = $fn;
    }

    public function resolve()
    {
        $method = strtolower($_SERVER['REQUEST_METHOD']);
        $url = $_SERVER['PATH_INFO'] ?? '/';

        if ($method === 'get') {
            $fn = $this->getRoutes[$url] ?? null;
        } else {
            $fn = $this->postRoutes[$url] ?? null;
        }
        if (!$fn) {
            echo 'Page not found';
            exit;
        }
        echo call_user_func([$fn], $this);
    }

    public function renderView($view, $params = [])
    {
        foreach ($params as $key => $value) {
            $$key = $value;
        }
        ob_start();
        include __DIR__."/views/$view.php";
        $content = ob_get_clean();
        include __DIR__."/views/_layout.php";
    }
}

这是index.php:

<?php

use app\controllers\ProductController;
use app\Router;

require_once __DIR__.'/../vendor/autoload.php';

$database = new \app\Database();
$router = new Router($database);

$router->get('/', [ProductController::class, 'index']);
$router->get('/products', [ProductController::class, 'index']);
$router->get('/products/index', [ProductController::class, 'index']);
$router->get('/products/create', [ProductController::class, 'create']);
$router->post('/products/create', [ProductController::class, 'create']);
$router->get('/products/update', [ProductController::class, 'update']);
$router->post('/products/update', [ProductController::class, 'update']);
$router->post('/products/delete', [ProductController::class, 'delete']);

$router->resolve();

Answer 1

根据您的回复，您传递给数组的函数似乎不是正确的可调用对象。

假设自动加载不是问题，因为错误消息的最后一部分将是未找到类“xx”。

我建议更改您的路由器并添加 callabale 类型提示，您可能会更早看到错误。

public function get($url, callable  $fn)
{
    $this->getRoutes[$url] = $fn;
}

public function post($url, callable $fn)
{
    $this->postRoutes[$url] = $fn;
}

   public function resolve()
    {
        $method = strtolower($_SERVER['REQUEST_METHOD']);
        $url = $_SERVER['PATH_INFO'] ?? '/';

        if ($method === 'get') {
            $fn = $this->getRoutes[$url] ?? null;
        } else {
            $fn = $this->postRoutes[$url] ?? null;
        }
        if (!$fn) {
            echo 'Page not found';
            exit;
        }
        echo call_user_func($fn, $this);
    }

然后它会工作。

我也不会将路由器与视图混合在一起。