filp/whoops · error · InvalidArgumentException

Invalid status code '$code', must be 4xx or 5xx

Error message

Invalid status code '$code', must be 4xx or 5xx

What it means

Error "Invalid status code '$code', must be 4xx or 5xx" thrown in filp/whoops.

Source

Thrown at src/Whoops/Run.php:321

     *
     * @throws InvalidArgumentException
     */
    public function sendHttpCode($code = null)
    {
        if (func_num_args() == 0) {
            return $this->sendHttpCode;
        }

        if (!$code) {
            return $this->sendHttpCode = false;
        }

        if ($code === true) {
            $code = 500;
        }

        if ($code < 400 || 600 <= $code) {
            throw new InvalidArgumentException(
                "Invalid status code '$code', must be 4xx or 5xx"
            );
        }

        return $this->sendHttpCode = $code;
    }

    /**
     * Should Whoops exit with a specific code on the CLI if possible?
     * Whoops will exit with 1 by default, but you can specify something else.
     *
     * @param int $code
     *
     * @return int
     *
     * @throws InvalidArgumentException
     */
    public function sendExitCode($code = null)

View on GitHub (pinned to fa1bc9c95a)

When it happens

Trigger: Thrown at src/Whoops/Run.php:321 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of filp/whoops@fa1bc9c95a (2026-08-21). Data as JSON: /api/errors/7ffcae60f321bdd1. Report an issue: GitHub.