Getting error while updating laravel from 5.5 to 5.7 (Undefined class constant 'HEADER_CLIENT_IP')

问题

i am getting this error.

Undefined class constant 'HEADER_CLIENT_IP' Script @php artisan package:discover handling the post-autoload-dump event returned with error code 1

I changed

app\Http\Middleware\TrustedProxies.php by:

    <?php

  namespace App\Http\Middleware;

  use Illuminate\Http\Request;
  use Fideloper\Proxy\TrustProxies as Middleware;

  class TrustProxies extends Middleware
  {
    protected $proxies;
    protected $headers = Request::HEADER_X_FORWARDED_ALL;
  }

Here is my .composerjson file

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=7.0.0",
        "fideloper/proxy": "~3.3",
        "laravel/framework": "5.7.*",
        "laravel/tinker": "~1.0",
        "tymon/jwt-auth": "^0.5.12"
    },
    "require-dev": {
        "filp/whoops": "~2.0",
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "~1.0",
        "phpunit/phpunit": "~6.0",
        "symfony/thanks": "^1.0"
    },
    "autoload": {
        "classmap": [
            "database/seeds",
            "database/factories"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "extra": {
        "laravel": {
            "dont-discover": [
            ]
        }
    },
    "scripts": {
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate"
        ],
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover"
        ]
    },
    "config": {
        "preferred-install": "dist",
        "sort-packages": true,
        "optimize-autoloader": true
    } }

I am still handling the same error. Can you guys figure it out where the problem is ?

回答1:

At composer.json Change fideloper/proxy

From

"fideloper/proxy": "~3.3",

"fideloper/proxy": "^4.0",

After that run

composer update

回答2:

1) change your composer.json to following

"php": ">=7.1.3",
"fideloper/proxy": "^4.0",
"laravel/framework": "5.7.*",
"laravel/tinker": "~1.0",

2) change your App\Http\Middleware\TrustProxies.php to following

<?php

namespace App\Http\Middleware;

use Illuminate\Http\Request;
use Fideloper\Proxy\TrustProxies as Middleware;

class TrustProxies extends Middleware
{
    /**
     * The trusted proxies for this application.
     *
     * @var array|string
     */
    protected $proxies;
    /**
     * The headers that should be used to detect proxies.
     *
     * @var int
     */
    protected $headers = Request::HEADER_X_FORWARDED_ALL;
}

3) remove the file from the config directory having name trustedproxy.php if exist

4) run the following command into the console from your application directory

composer update

5) this step is not necessary but it will clear all cache and autoload files

php artisan clear-compiled

composer dump-autoload

php artisan cache:clear

php artisan config:clear

php artisan view:clear

回答3:

Did you try to update the composer

composer update

and dump the autoload ?

composer dump-autoload

来源：https://stackoverflow.com/questions/52984601/getting-error-while-updating-laravel-from-5-5-to-5-7-undefined-class-constant

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