ClientId.php

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<?php

declare(strict_types=1);

namespace ILIAS\Data;

class ClientId
{
    private string $clientId;

    public function __construct(string $clientId)
    {
        if ($clientId === '') {
            throw new \InvalidArgumentException('Empty $clientId');
        }

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

        $this->clientId = $clientId;
    }

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

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