ClientId.php

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<?php
/* Copyright (c) 1998-2018 ILIAS open source, Extended GPL, see docs/LICENSE */

namespace ILIAS\Data;

class ClientId
{
    private $clientId = '';

    public function __construct($clientId)
    {
        if (!is_string($clientId)) {
            throw new \InvalidArgumentException('Invalid value for $clientId');
        }

        if (preg_match('/[^A-Za-z0-9#_\.\-]/', $clientId)) {
            throw new \InvalidArgumentException('Invalid value for $clientId');
        }

        $this->clientId = $clientId;
    }

    public function toString()
    {
        return $this->clientId;
    }

    public function __toString()
    {
        return $this->toString();
    }
}