Seldaek/monolog · error · InvalidArgumentException

The given message type "%s" is not supported

Error message

The given message type "%s" is not supported

What it means

Error "The given message type "%s" is not supported" thrown in Seldaek/monolog.

Source

Thrown at src/Monolog/Handler/ErrorLogHandler.php:47

    /** @var 0|4 */
    protected int $messageType;
    protected bool $expandNewlines;

    /**
     * @param 0|4 $messageType    Says where the error should go.
     * @param bool $expandNewlines If set to true, newlines in the message will be expanded to be take multiple log entries
     *
     * @throws \InvalidArgumentException If an unsupported message type is set
     */
    public function __construct(int $messageType = self::OPERATING_SYSTEM, int|string|Level $level = Level::Debug, bool $bubble = true, bool $expandNewlines = false)
    {
        parent::__construct($level, $bubble);

        if (false === \in_array($messageType, self::getAvailableTypes(), true)) {
            $message = sprintf('The given message type "%s" is not supported', print_r($messageType, true));

            throw new \InvalidArgumentException($message);
        }

        $this->messageType = $messageType;
        $this->expandNewlines = $expandNewlines;
    }

    /**
     * @return int[] With all available types
     */
    public static function getAvailableTypes(): array
    {
        return [
            self::OPERATING_SYSTEM,
            self::SAPI,
        ];
    }

    /**

View on GitHub (pinned to 57eb102834)

When it happens

Trigger: Thrown at src/Monolog/Handler/ErrorLogHandler.php:47 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Seldaek/monolog@57eb102834 (2026-08-17). Data as JSON: /api/errors/6d66322f4c0c63ef. Report an issue: GitHub.