通常,您可以通过$context参数访问 custom validation rule中的所有数据,其中它存储在数据键中,即$context [‘data’] [‘confirm_password’],然后您可以将其与当前字段值进行比较.

$validator->add('password','passwordsEqual',[
    'rule' => function ($value,$context) {
        return
            isset($context['data']['confirm_password']) &&
            $context['data']['confirm_password'] === $value;
    }
]);

话虽如此,最近引入了一个compareWITh验证规则,正是这样做的.

https://github.com/cakephp/cakephp/pull/5813

$validator->add('password',[
    'compare' => [
        'rule' => ['compareWith','confirm_password']
    ]
]);