InArrayValidator.php

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<?php
namespace TYPO3\CMS\Form\Validation;

class InArrayValidator extends \TYPO3\CMS\Form\Validation\AbstractValidator {

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_inarray';

    protected $array;

    protected $strict;

    public function __construct($arguments) {
        $this->setArray($arguments['array.'])->setStrict($arguments['strict']);
        parent::__construct($arguments);
    }

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            if (!in_array($value, $this->array, $this->strict)) {
                return FALSE;
            }
        }
        return TRUE;
    }

    public function setArray($array) {
        $this->array = (array) $array;
        return $this;
    }

    public function setStrict($strict) {
        $this->strict = (bool) $strict;
        return $this;
    }

}