PHP 8.0.0 的两处变化导致 Laravel 4.2 无法正常运行，它们是：
The mbstring.func_overload directive has been removed. The related MB_OVERLOAD_MAIL, MB_OVERLOAD_STRING, and MB_OVERLOAD_REGEX constants have also been removed. Finally, the "func_overload" and "func_overload_list" entries in mb_get_info() have been removed.
For call_user_func_array(), this behavior constitutes a minor backwards-compatibility break: Previously, array keys were completely ignored by this function. Now, string keys will be interpreted as parameter names.
必须修改如下两个部分：
文件：vendor/laravel/framework/src/Illuminate/Routing/Route.php
找到：
public function run()
{
$parameters = array_filter($this->parameters(), function($p) { return isset($p); });
return call_user_func_array($this->action['uses'], $parameters);
}
改为：
public function run()
{
$parameters = array_filter($this->parameters(), function($p) { return isset($p); });
return call_user_func_array($this->action['uses'], array_values($parameters) ); // 这里增加了 array_values()
}
在 vendor 目录中搜索 MB_OVERLOAD_STRING 常量，将所有的用例替换为数字 “2”。
目前为止，只发现了这2处兼容性问题。
⚠️ 这个修改似乎不是必须的
编辑 vendor/laravel/framework/src/Illuminate/Exception/Handler.php，行 328，找到
protected function formatException(\Exception $e)
改为
protected function formatException(\Throwable $e) // Throwable 是 Exception 的 interface
编辑 vendor/laravel/framework/src/Illuminate/Routing/Controller.php，找到
public function callAction($method, $parameters)
{
$this->setupLayout();
$response = call_user_func_array(array($this, $method), $parameters);
改为
public function callAction($method, $parameters)
{
$this->setupLayout();
$response = call_user_func_array(array($this, $method), array_values($parameters)); // 这里增加 array_values()
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almost 6 years ago
docker pull wyg27/laravel42-php8