lib/Dropbox/AppInfo.php
static function loadFromJson($jsonArr)
    {
        if (!is_array($jsonArr)) {
            throw new AppInfoLoadException("Expecting JSON object, got something else");
        }

        $requiredKeys = array("key", "secret");
        foreach ($requiredKeys as $key) {
            if (!array_key_exists($key, $jsonArr)) {
                throw new AppInfoLoadException("Missing field \"$key\"");
            }

            if (!is_string($jsonArr[$key])) {
                throw new AppInfoLoadException("Expecting field \"$key\" to be a string");
            }
        }

        // Check app_key and app_secret
        $appKey = $jsonArr["key"];
        $appSecret = $jsonArr["secret"];

        $tokenErr = self::getTokenPartError($appKey);
        if (!is_null($tokenErr)) {
            throw new AppInfoLoadException("Field \"key\" doesn't look like a valid app key: $tokenErr");
        }

        $tokenErr = self::getTokenPartError($appSecret);
        if (!is_null($tokenErr)) {
            throw new AppInfoLoadException("Field \"secret\" doesn't look like a valid app secret: $tokenErr");
        }

        try {
            $host = Host::loadFromJson($jsonArr);
        }
        catch (HostLoadException $ex) {
            throw new AppInfoLoadException($ex->getMessage());
        }

        return new AppInfo($appKey, $appSecret, $host);
    }
static function loadFromJson($jsonArr)
    {
        if (!is_array($jsonArr)) {
            throw new AppInfoLoadException("Expecting JSON object, got something else");
        }

        $requiredKeys = array("key", "secret");
        foreach ($requiredKeys as $key) {
            if (!array_key_exists($key, $jsonArr)) {
                throw new AppInfoLoadException("Missing field \"$key\"");
            }

            if (!is_string($jsonArr[$key])) {
                throw new AppInfoLoadException("Expecting field \"$key\" to be a string");
            }
        }

        // Check app_key and app_secret
        $appKey = $jsonArr["key"];
        $appSecret = $jsonArr["secret"];

        $tokenErr = self::getTokenPartError($appKey);
        if (!is_null($tokenErr)) {
            throw new AppInfoLoadException("Field \"key\" doesn't look like a valid app key: $tokenErr");
        }

        $tokenErr = self::getTokenPartError($appSecret);
        if (!is_null($tokenErr)) {
            throw new AppInfoLoadException("Field \"secret\" doesn't look like a valid app secret: $tokenErr");
        }

        try {
            $host = Host::loadFromJson($jsonArr);
        }
        catch (HostLoadException $ex) {
            throw new AppInfoLoadException($ex->getMessage());
        }

        return new AppInfo($appKey, $appSecret, $host);
    }
Parses a JSON object to build an AppInfo object.  If you would like to load this from a file,
use the loadFromJsonFile() method.

@param array $jsonArr Output from json_decode($str, true)

@return AppInfo

@throws AppInfoLoadException