IsString.php

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<?php
/* Copyright (c) 2018 Fabian Schmid <fs@studer-raimann.ch> Extended GPL, see docs/LICENSE */

namespace ILIAS\Validation\Constraints;

use ILIAS\Validation\Constraint;
use ILIAS\Data;
use ILIAS\Data\Result;

class IsString extends Custom implements Constraint
{

    public function __construct(Data\Factory $data_factory, \ilLanguage $lng)
    {
        parent::__construct(
            function ($value) {
                return is_string($value);
            },
            function ($txt, $value) {
                return $txt("not_a_string", gettype($value));
            },
            $data_factory,
            $lng
        );
    }
}