在Laravel 8.3中，他们引入了一个新特性，stopOnFirstFailure，它可以在规则失败时完全停止验证。我希望在Laravel 7中使用这个特性。在检查Laravel 8的***vendor/laravel/framework/src/Validation/Validator.php***时，我发现***stopOnFirstFailure***只是在***Validator.php***的***passes***函数中添加了一个if语句，如果受保护的变量***stopOnFirstFailure***是真的。在Laravel 7中是否可以通过扩展/覆盖Validator.php类来实现这些？我一直在研究扩展核心Laravel类，偶然发现了这个article，但它有点令人困惑，因为这篇文章只介绍了如何覆盖特定的函数。在我的例子中，我需要声明一个受保护的变量，覆盖一个函数，并声明一个新函数。
Laravel 8验证器. php代码：
声明变量：

/**
     * Indicates if the validator should stop on the first rule failure.
     *
     * @var bool
     */
    protected $stopOnFirstFailure = false;

***第一次故障时停止***功能：

/**
     * Instruct the validator to stop validating after the first rule failure.
     *
     * @param  bool  $stopOnFirstFailure
     * @return $this
     */
    public function stopOnFirstFailure($stopOnFirstFailure = true)
    {
        $this->stopOnFirstFailure = $stopOnFirstFailure;

        return $this;
    }

***通过***函数：

/**
     * Determine if the data passes the validation rules.
     *
     * @return bool
     */
    public function passes()
    {
        $this->messages = new MessageBag;

        [$this->distinctValues, $this->failedRules] = [[], []];

        // We'll spin through each rule, validating the attributes attached to that
        // rule. Any error messages will be added to the containers with each of
        // the other error messages, returning true if we don't have messages.
        foreach ($this->rules as $attribute => $rules) {
            if ($this->shouldBeExcluded($attribute)) {
                $this->removeAttribute($attribute);

                continue;
            }

            if ($this->stopOnFirstFailure && $this->messages->isNotEmpty()) {
                break;
            }

            foreach ($rules as $rule) {
                $this->validateAttribute($attribute, $rule);

                if ($this->shouldBeExcluded($attribute)) {
                    $this->removeAttribute($attribute);

                    break;
                }

                if ($this->shouldStopValidating($attribute)) {
                    break;
                }
            }
        }

编辑：验证器在我的代码中被窗体请求使用。我的代码示例：

class UpdateRegistrationTagsRequest extends FormRequest
{
    protected $stopOnFirstFailure = true;
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'product_id' => ['required'],
            'product.*.type' => ['required','distinct'],
            'product.*.value' => ['required'],
            'product' => ['bail', 'required', 'array', new CheckIfArrayOfObj, new CheckIfProductTypeExists($this->product_id)]
        ];
    }

    protected function failedValidation(\Illuminate\Contracts\Validation\Validator $validator)
    {
        $response = new JsonResponse(['api' => [
            'header' => [
                'message' => 'The given data is invalid', 
                'errors' => $validator->errors()->first()   
            ],
            'body' => ''
                ]], 422);

        throw new \Illuminate\Validation\ValidationException($validator, $response);
    }
}

编辑：遵循@ thefalled的建议，下面是我所做的.我的CustomValidator.php类在应用程序目录内的CustomClass中：

<?php 

namespace App\CustomClass;
use Illuminate\Validation\Validator;
use Illuminate\Support\MessageBag;

class CustomValidator extends Validator
{
    /**
     * Indicates if the validator should stop on the first rule failure.
     *
     * @var bool
     */
    protected $stopOnFirstFailure = true;

     /**
     * Instruct the validator to stop validating after the first rule failure.
     *
     * @param  bool  $stopOnFirstFailure
     * @return $this
     */
    public function stopOnFirstFailure($stopOnFirstFailure = true)
    {
        $this->stopOnFirstFailure = $stopOnFirstFailure;

        return $this;
    }

    /**
     * Determine if the data passes the validation rules.
     *
     * @return bool
     */
    public function passes()
    {
        $this->messages = new MessageBag;

        [$this->distinctValues, $this->failedRules] = [[], []];

        // We'll spin through each rule, validating the attributes attached to that
        // rule. Any error messages will be added to the containers with each of
        // the other error messages, returning true if we don't have messages.
        foreach ($this->rules as $attribute => $rules) {
            if ($this->shouldBeExcluded($attribute)) {
                $this->removeAttribute($attribute);

                continue;
            }

            if ($this->stopOnFirstFailure && $this->messages->isNotEmpty()) {
                break;
            }

            foreach ($rules as $rule) {
                $this->validateAttribute($attribute, $rule);

                if ($this->shouldBeExcluded($attribute)) {
                    $this->removeAttribute($attribute);

                    break;
                }

                if ($this->shouldStopValidating($attribute)) {
                    break;
                }
            }
        }
        return parent::passes();
    }
}

CustomClass文件夹中的我的验证器工厂

<?php 

namespace App\CustomClass;
use Illuminate\Validation\Factory;
use App\CustomClass\CustomValidator;

class ValidatorFactory extends Factory
{
    protected function resolve( array $data, array $rules, array $messages, array $customAttributes )
    {
        if (is_null($this->resolver)) {
            return new CustomValidator($this->translator, $data, $rules, $messages, $customAttributes);
        }

        return call_user_func($this->resolver, $this->translator, $data, $rules, $messages, $customAttributes);
    }
}

我的应用程序服务提供程序：

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\CustomClass\ValidatorFactory;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->extend('validator', function () {
            return $this->app->get(ValidatorFactory::class);
        });
    }

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }
}