Laravel Validator after 方法如何使用外部变量

$validator = Validator::make($request->all(), [
    // ... 验证规则
]);

$validator->after(function ($validator) {
    // 在这里执行额外的验证逻辑
    if ($this->someConditionIsMet()) {
        $validator->errors()->add('field', 'This field has an additional error.');
    }
});

if ($validator->fails()) {
    // 验证失败处理
}

$validator = Validator::make($request->all(), [
    // ... 验证规则
]);

$customVariable = 'specific_status';

// 这种直接传递参数的方式是无效的
$validator->after(function ($validator, $customVariable) {
    if ($this->somethingElseIsInvalid()) {
        $validator->errors()->add(
            'field', 'Something is wrong because of ' . $customVariable
        );
    }
});

if ($validator->fails()) {
    // ...
}

<?php

use Illuminate\Support\Facades\Validator;
use Illuminate\Http\Request;

// 假设在一个控制器方法中
class MyController extends Controller
{
    public function store(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'name' => 'required|string|max:255',
            'email' => 'required|email|unique:users',
            'age' => 'nullable|integer|min:18',
        ]);

        // 定义需要在闭包中使用的外部变量
        $customStatusMessage = 'not happy with the age';
        $minimumAllowedAge = 21; // 另一个外部变量

        $validator->after(function ($validator) use ($customStatusMessage, $minimumAllowedAge, $request) {
            // 假设我们想检查一个额外的条件，例如年龄是否低于某个特定值，并且基于外部消息
            if ($request->input('age') !== null && $request->input('age') < $minimumAllowedAge) {
                $validator->errors()->add(
                    'age', 'The age provided is too low because you are ' . $customStatusMessage
                );
            }
            // 更多自定义逻辑...
        });

        if ($validator->fails()) {
            return redirect('some/form')
                        ->withErrors($validator)
                        ->withInput();
        }

        // 验证成功，执行后续逻辑
        // ...
        return 'Validation successful!';
    }

    // 假设这是一个模拟方法，用于演示
    private function somethingElseIsInvalid()
    {
        return true; // 实际应用中会有具体的判断逻辑
    }
}