Date validator that validates if the date is great

问题:

$form = new Zend_Form();

$mockDate = new Zend_Form_Element_Text('mock');

$mockDate->addValidator(???????);

$form->addElements(array($mockDate));

$result = $form->isValid();

if ($result) echo "YES!!!";
else echo "NO!!!";

Assumption that the element is in a date format. How do I determine that the date given is greater than or equal to today?

回答1:

You can create a simple validator to do this:

class My_Validate_DateGreaterThanToday extends Zend_Validate_Abstract
{
    const DATE_INVALID = 'dateInvalid';

    protected $_messageTemplates = array(
        self::DATE_INVALID => "'%value%' is not greater than or equal today"
    );

    public function isValid($value)
    {
        $this->_setValue($value);

        $today = date('Y-m-d');

        // expecting $value to be YYYY-MM-DD
        if ($value < $today) {
            $this->_error(self::DATE_INVALID);
            return false;
        }

        return true;
    }
}

And add it to the element:

$mockDate->addValidator(new My_Validate_DateGreaterThanToday());

You probably want to check the date with Zend_Date for localization of dates and further benefits.

For creating custom validates, take a look at writing validators from Zend´s manual.

回答2:

The question is rather old. In the current version of ZF2 it is not necessary to write new validators. Simply add a filter / validator like this:

public function getInputFilter()
{
    if(!$this->inputFilter){
        $inputFilter = new InputFilter();
        $inputFilter->add(array(
            'name' => 'mock',
            'validators' => array(
                array('name' => 'Date'),
                array(
                    'name' => 'GreaterThan',
                    'options' => array(
                        'min' => date('Y-m-d'),
                    ),
                ),
            ),
        ));
        $this->inputFilter = $inputFilter;
    }
    return $this->inputFilter;
}

And it does the job. There is also an option called 'inclusive' which if set to 'true' (in the 'options' of GreaterThan), will allow 'today' to be a valid date

回答3:

class My_Validate_DateGreaterThanToday extends Zend_Validate_Abstract
{
    const DATE_INVALID = 'dateInvalid';

    protected $_messageTemplates = array(
        self::DATE_INVALID => "'%value%' is not greater than today"
    );

    public function isValid($value) {
        $this->_setValue($value);

        $date = new Zend_Date($value);
        $date->addDay(1);
        $now = new Zend_Date();

        // expecting $value to be YYYY-MM-DD
        if ($now->isLater($date)) {
            $this->_error(self::DATE_INVALID);
            return false;
        }

        return true;
    }
}

that's better because uses standardized Zend_Date methods to check dates, the other awsner user a string comparison that can evaluate to impredictable values...