IntegerValidator.php

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<?php
namespace TYPO3\CMS\Extbase\Validation\Validator;

class IntegerValidator extends AbstractValidator {

    public function isValid($value) {
        if (filter_var($value, FILTER_VALIDATE_INT) === FALSE) {
            $this->addError(
                $this->translateErrorMessage(
                'validator.integer.notvalid',
                'extbase'
                ), 1221560494);
        }
    }
}