StackFormation\Profile\YamlCredentialProvider::getEnvVarsForProfile PHP Method

    public function getEnvVarsForProfile($profile)
    {
        $envVars = [];
        if (!$this->isValidProfile($profile)) {
            throw new \Exception("Invalid profile: {$profile}");
        }
        $config = $this->getConfig();
        $profileConfig = $config[$profile];
        if (false === empty($profileConfig['access_key'])) {
            $envVars['AWS_ACCESS_KEY_ID'] = $profileConfig['access_key'];
            unset($profileConfig['access_key']);
        } else {
            throw new \Exception("Invalid access_key in profile {$profile}");
        }
        if (false === empty($profileConfig['secret_key'])) {
            $envVars['AWS_SECRET_ACCESS_KEY'] = $profileConfig['secret_key'];
            unset($profileConfig['secret_key']);
        } else {
            throw new \Exception("Invalid secret_key in profile {$profile}");
        }
        if (false === empty($profileConfig['region'])) {
            $envVars['AWS_DEFAULT_REGION'] = $profileConfig['region'];
            unset($profileConfig['region']);
        }
        if (false === empty($profileConfig['filter'])) {
            $envVars['STACKFORMATION_NAME_FILTER'] = $profileConfig['filter'];
            unset($profileConfig['filter']);
        }
        foreach ($profileConfig as $key => $value) {
            if (false === (bool) preg_match('/^[a-z0-9-_]+/', $key)) {
                throw new \Exception("Invalid environment variable in profile {$profile}");
            } else {
                $envVars[strtoupper(str_replace('-', '_', $key))] = sprintf('"%s"', $value);
            }
        }
        return $envVars;
    }