空值传递给Zend Framework 2验证器 [英] Empty values passed to Zend framework 2 validators

问题描述

如何通过Zend Framework 2 ValidatorChain将空值传递给自定义验证器?

How can I pass an empty value through Zend framework 2 ValidatorChain to my custom validator?

ZF1上的allowEmpty(false)

在ZF2上具有空元素值:

On ZF2 with empty element value :

• 如果为allowEmpty = false，则将NotEmptyValidator与breakOnFailure = true，@see Zend/InputFilter/Input#injectNotEmptyValidator添加到ValidatorChain的顶部.

• If allowEmpty = false, NotEmptyValidator is added to the top of ValidatorChain with breakOnFailure = true, @see Zend/InputFilter/Input#injectNotEmptyValidator.

如果allowEmpty = true，则将Element视为有效，@see Zend/InputFilter/BaseInputFilter#isValid

If allowEmpty = true, Element is considered as Valid, @see Zend/InputFilter/BaseInputFilter#isValid

if ($input->allowEmpty()) {
    $this->validInputs[$name] = $input;
    continue;
}

推荐答案

以下适用于ZF2 2.1.1版:

Following works for ZF2 version 2.1.1:

问题(如果我正确理解的话)是在下面的示例中，对于'fieldName'的空值，没有触发验证.尽管在

The problem (if I got it correctly) is that in following example, for empty values of 'fieldName', no validation is triggered. This can be quite annoying, though in

$input = new \Zend\InputFilter\Input('fieldName');

$input
    ->setAllowEmpty(true)
    ->setRequired(false)
    ->getValidatorChain()
    ->attach(new \Zend\Validator\Callback(function ($value) {
        echo 'called validator!';

        return true; // valid
    }));

$inputFilter = new \Zend\InputFilter\InputFilter();
$inputFilter->add($input);

$inputFilter->setData(array('fieldName' => 'value'));
var_dump($inputFilter->isValid()); // true, echoes 'called validator!'

$inputFilter->setData(array('fieldName' => ''));
var_dump($inputFilter->isValid()); // true, no output

$inputFilter->setData(array());
var_dump($inputFilter->isValid()); // true, no output

遇到特殊情况时，这很烦人，例如检查分配给CMS中页面的URL并避免冲突(空URL仍然是URL！).

This is quite annoying when you have particular cases, like checking an URL assigned to a page in your CMS and avoiding collisions (empty URL is still an URL!).

有一种处理空字符串的方法，它基本上是自己附加NotEmpty验证程序，并避免调用setRequired和setAllowEmpty.这基本上会告诉 Zend\InputFilter\Input#injectNotEmptyValidator 请勿自动将NotEmpty验证程序附加到其上:

There's a way of handling this for empty strings, which is to basically attach the NotEmpty validator on your own, and avoiding calls to setRequired and setAllowEmpty. This will basically tell Zend\InputFilter\Input#injectNotEmptyValidator not to utomatically attach a NotEmpty validator on its own:

$input = new \Zend\InputFilter\Input('fieldName');

$input
    ->getValidatorChain()
    ->attach(new \Zend\Validator\NotEmpty(\Zend\Validator\NotEmpty::NULL))
    ->attach(new \Zend\Validator\Callback(function ($value) {
        echo 'called validator!';

        return true; // valid
    }));

$inputFilter = new \Zend\InputFilter\InputFilter();
$inputFilter->add($input);

$inputFilter->setData(array('fieldName' => 'value'));
var_dump($inputFilter->isValid()); // true, echoes 'called validator!'

$inputFilter->setData(array('fieldName' => ''));
var_dump($inputFilter->isValid()); // true, echoes 'called validator!'

$inputFilter->setData(array());
var_dump($inputFilter->isValid()); // false (null was passed to the validator)

如果您还想检查null，则需要扩展Zend\InputFilter\Input，如下所示:

If you also want to check against null, you will need to extend Zend\InputFilter\Input as following:

class MyInput extends \Zend\InputFilter\Input
{
    // disabling auto-injection of the `NotEmpty` validator
    protected function injectNotEmptyValidator() {}
}

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