PHPMailer::generateId(): string

3009    protected function generateId()3010    {3011        $len = 32; //32 bytes = 256 bits3012        $bytes = '';3013        if (function_exists('random_bytes')) {3014            try {3015                // phpcs:ignore PHPCompatibility.FunctionUse.NewFunctions.random_bytesFound -- Wrapped in function_exists.3016                $bytes = random_bytes($len);3017            } catch (\Exception $e) {3018                //Do nothing3019            }3020        } elseif (function_exists('openssl_random_pseudo_bytes')) {3021            /** @noinspection CryptographicallySecureRandomnessInspection */3022            $bytes = openssl_random_pseudo_bytes($len);3023        }3024        if ($bytes === '') {3025            //We failed to produce a proper random string, so make do.3026            //Use a hash to force the length to the same as the other methods3027            $bytes = hash('sha256', uniqid((string) mt_rand(), true), true);3028        }3029 3030        //We don't care about messing up base64 format here, just want a random string3031        return str_replace(['=', '+', '/'], '', base64_encode(hash('sha256', $bytes, true)));3032    }