NotEmpty Validator

This validator allows you to validate if a given value is not empty. This is often useful when working with form elements or other user input, where you can use it to ensure required elements have values associated with them.

Supported options

The following options are supported for Zend\Validator\NotEmpty:

Default behaviour

By default, this validator works differently than you would expect when you've worked with PHP's empty() operator. In particular, this validator will evaluate both the integer 0 and string '0' as empty.

$valid = new Zend\Validator\NotEmpty();
$value  = '';
$result = $valid->isValid($value);
// returns false

Specifying empty behavior

Some projects have differing opinions of what is considered an "empty" value: a string with only whitespace might be considered empty, or 0 may be considered non-empty (particularly for boolean sequences). To accommodate differing needs, Zend\Validator\NotEmpty allows you to configure which types should be validated as empty and which not.

The following types can be handled:

All other given values will return true per default.

There are several ways to select which of the above types are validated. You can give one or multiple types and add them, you can provide an array, you can use constants, or you can provide a textual string. See the following examples:

use Zend\Validator\NotEmpty;

// Returns false on 0
$validator = new NotEmpty(NotEmpty::INTEGER);

// Returns false on 0 or '0'
$validator = new NotEmpty( NotEmpty::INTEGER | NotEmpty::ZERO);

// Returns false on 0 or '0'
$validator = new NotEmpty([ NotEmpty::INTEGER, NotEmpty::ZERO ]);

// Returns false on 0 or '0'
$validator = new NotEmpty(['integer', 'zero']);

You can also provide an instance of Traversable to set the desired types. To set types after instantiation, use the setType() method.