Laravel 5.1在运行’php artisan serve’时给出’undefined index：http_host’

我使用5.4版学习了laravel 6个月.然后我安装了最新的xampp.但是现在我开始从事基于laravel 5.1的项目.但是,当我想运行该应用程序时,它给了我错误(未定义的索引：http_host)！我如何找到错误的来源？
我该如何解决这个问题？我在网上搜索,但没有发现任何成果.
你能帮我吗？
Storage / log.PHP：

[2017-07-18 21:55:50] local.ERROR: ErrorException: Undefined index: HTTP_HOST in H:\Current\school\school\app\Providers\AppServiceProvider.PHP:40

堆栈跟踪：

#0 H:\Current\school\school\app\Providers\AppServiceProvider.PHP(40): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(8, 'Undefined index...', 'H:\\Current\\scho...', 40, Array)
#1 [internal function]: Erp\Providers\AppServiceProvider->boot()
#2 H:\Current\school\school\vendor\laravel\framework\src\Illuminate\Container\Container.PHP(507): call_user_func_array(Array, Array)
#3 H:\Current\school\school\vendor\laravel\framework\src\Illuminate\Foundation\Application.PHP(734): Illuminate\Container\Container->call(Array)
#4 H:\Current\school\school\vendor\laravel\framework\src\Illuminate\Foundation\Application.PHP(717): Illuminate\Foundation\Application->bootProvider(Object(Erp\Providers\AppServiceProvider))
#5 [internal function]: Illuminate\Foundation\Application->Illuminate\Foundation\{closure}(Object(Erp\Providers\AppServiceProvider), 18)
#6 H:\Current\school\school\vendor\laravel\framework\src\Illuminate\Foundation\Application.PHP(718): array_walk(Array, Object(Closure))
#7 H:\Current\school\school\vendor\laravel\framework\src\Illuminate\Foundation\Bootstrap\BootProviders.PHP(17): Illuminate\Foundation\Application->boot()
#8 H:\Current\school\school\vendor\laravel\framework\src\Illuminate\Foundation\Application.PHP(203): Illuminate\Foundation\Bootstrap\BootProviders->bootstrap(Object(Illuminate\Foundation\Application))
#9 H:\Current\school\school\vendor\laravel\framework\src\Illuminate\Foundation\Console\Kernel.PHP(208): Illuminate\Foundation\Application->bootstrapWith(Array)
#10 H:\Current\school\school\vendor\laravel\framework\src\Illuminate\Foundation\Console\Kernel.PHP(105): Illuminate\Foundation\Console\Kernel->bootstrap()
#11 H:\Current\school\school\artisan(35): Illuminate\Foundation\Console\Kernel->handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#12 {main}  

AppServiceProvider：

public function boot()

{

    if(!Session::get(SITE_ID)){
        $subdomain_name = array_shift((explode(".",$_SERVER['HTTP_HOST'])));
        if(isset($subdomain_name) && !empty($subdomain_name)){
            $domain = $subdomain_name;
        }else{
            $domain = "school";
        }
        $sitetoRecollect = DB::table('site_infos')->where('site_alias',$domain)->first();

        if(isset($sitetoRecollect->id) && !empty($sitetoRecollect->id) && $sitetoRecollect->id != 0){

            Session::put(SITE_ID,$sitetoRecollect->id);

        }else{

            Session::put(SITE_ID,1);

        }

    }

}

40线：

$subdomain_name = array_shift((explode(".",$_SERVER['HTTP_HOST'])));

解决方法:

变量$_SERVER [‘HTTP_HOST’]仅适用于浏览器,不适用于PHP-CLI,因此,当您运行命令PHP artisan $_SERVER [‘HTTP_HOST’]将不存在时,可以在此处进行检查Undefined index HTTP_HOST even though it is checked

在这种情况下,可以通过检查$_SERVER [‘HTTP_HOST’]是否存在来修复代码.

if(isset($_SERVER['HTTP_HOST']) && !empty($_SERVER['HTTP_HOST'])){
    $gethost = explode(".",$_SERVER['HTTP_HOST']);
    $domain = array_shift($gethost);
}else{
    $domain = "school";
}

关于线路将解决您的问题,并且会有一些改进.这是固定代码的完整版本,并经过测试.

public function boot()
{
    if(!Session::get(SITE_ID)){
        $domain = "school";
        if(isset($_SERVER['HTTP_HOST']) && !empty($_SERVER['HTTP_HOST'])){
            $gethost = explode(".",$_SERVER['HTTP_HOST']);
            $domain = array_shift($gethost);
        }
        $sitetoRecollect = DB::table('site_infos')->where('site_alias', $domain)->first();
        if(isset($sitetoRecollect->id) != 0 && !empty($sitetoRecollect->id))
        {
            Session::put(SITE_ID, $sitetoRecollect->id);
        }else{
            Session::put(SITE_ID,1);
        }
    }
}

希望有帮助