yiisoft/yii2 · error · InvalidArgumentException

Second parameter($array) cannot be ArrayAccess in case insen

Error message

Second parameter($array) cannot be ArrayAccess in case insensitive mode

What it means

Error "Second parameter($array) cannot be ArrayAccess in case insensitive mode" thrown in yiisoft/yii2.

Source

Thrown at framework/helpers/BaseArrayHelper.php:640

     * @return bool whether the array contains the specified key
     */
    public static function keyExists($key, $array, $caseSensitive = true)
    {
        // ToDo: This check can be removed when the minimum PHP version is >= 8.1 (Yii2.2)
        if (is_float($key)) {
            $key = (int)$key;
        }

        if ($caseSensitive) {
            if (is_array($array) && array_key_exists($key, $array)) {
                return true;
            }
            // Cannot use `array_has_key` on Objects for PHP 7.4+, therefore we need to check using [[ArrayAccess::offsetExists()]]
            return $array instanceof ArrayAccess && $array->offsetExists($key);
        }

        if ($array instanceof ArrayAccess) {
            throw new InvalidArgumentException('Second parameter($array) cannot be ArrayAccess in case insensitive mode');
        }

        foreach (array_keys($array) as $k) {
            if (strcasecmp($key, $k) === 0) {
                return true;
            }
        }

        return false;
    }

    /**
     * Sorts an array of objects or arrays (with the same structure) by one or several keys.
     * @param array $array the array to be sorted. The array will be modified after calling this method.
     * @param string|\Closure|array $key the key(s) to be sorted by. This refers to a key name of the sub-array
     * elements, a property name of the objects, or an anonymous function returning the values for comparison
     * purpose. The anonymous function signature should be: `function($item)`.
     * To sort by multiple keys, provide an array of keys here.

View on GitHub (pinned to 66f00d18a2)

When it happens

Trigger: Thrown at framework/helpers/BaseArrayHelper.php:640 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of yiisoft/yii2@66f00d18a2 (2026-08-17). Data as JSON: /api/errors/4e7969f6f71953ba. Report an issue: GitHub.