Laravel 貌似会覆盖 php.ini 的 error_log 和 log_errors 配置

框架初始化时已经利用 set_error_handler([$this, 'handleError']); 注册错误处理器了，

Illuminate/Foundation/Bootstrap/HandleExceptions.php

    /**
     * Bootstrap the given application.
     *
     * @param  \Illuminate\Contracts\Foundation\Application  $app
     * @return void
     */
    public function bootstrap(Application $app)
    {
        $this->app = $app;

        error_reporting(-1);

        set_error_handler([$this, 'handleError']);

        set_exception_handler([$this, 'handleException']);

        register_shutdown_function([$this, 'handleShutdown']);

        if (! $app->environment('testing')) {
            ini_set('display_errors', 'Off');
        }
    }