Nu-coder> нужен фикс $this

[sidxx55]

        {
                ->keyFile = $keyFile;
                ->encodeKey = $encode_key;
        }

        public function checkKey()
        {
                $code = readKey();

                if ($code != KC_OK) {
                        error($code);
                }

                $code = checkControl();

                if ($code != KC_OK) {
                        error($code);
                }

                $code = checkLimits();

                if ($code != KC_OK) {
                        error($code);
                }

                return ->key;
        }

надо

public function __construct($keyFile, $encode_key)
    {
        $this->keyFile = $keyFile;
        $this->encodeKey = $encode_key;
    }

    public function checkKey()
    {
        $code = $this->readKey();

        if ($code != KC_OK) {
            $this->error($code);
        }

        $code = $this->checkControl();

        if ($code != KC_OK) {
            $this->error($code);
        }

        $code = $this->checkLimits();

        if ($code != KC_OK) {
            $this->error($code);
        }

        return $this->key;
    }