add prefix to env variables

.env-default

@@ -1,4 +1,4 @@
-USER=""
-PASSWORD=""
-DOMAIN_UPDATE=""
+DYNDNS_USER=""
+DYNDNS_PASSWORD=""
+DYNDNS_DOMAIN_UPDATE=""
 LOCAL=false

docker-compose.yml

@@ -12,7 +12,7 @@ services:
       - ./project:/var/www/html
       - ./logs/cron.log:/var/log/cron.log
     environment:
-      USER: "${USER}"
-      PASSWORD: "${PASSWORD}"
-      DOMAIN_UPDATE: "${DOMAIN_UPDATE}"
+      DYNDNS_USER: "${DYNDNS_USER}"
+      DYNDNS_PASSWORD: "${DYNDNS_PASSWORD}"
+      DYNDNS_DOMAIN_UPDATE: "${DYNDNS_DOMAIN_UPDATE}"
       LOCAL: "${LOCAL}"

project/updateip.php

@@ -6,9 +6,9 @@ if (isset($_ENV['LOCAL']) && $_ENV['LOCAL']) {
 }
 // old
 // https://www.duckdns.org/update?domains=rhost.duckdns.org&token=1b4ab267-b818-4407-8351-8800c6f4fd78
-$toUpdateString = $_ENV['DOMAIN_UPDATE'];
-$user = $_ENV['USER'];
-$pass = $_ENV['PASSWORD'];
+$toUpdateString = $_ENV['DYNDNS_DOMAIN_UPDATE'];
+$user = $_ENV['DYNDNS_USER'];
+$pass = $_ENV['DYNDNS_PASSWORD'];
 $dateUpdate = date("Y-m-d H:i:s");
 
 if (!$toUpdateString || !$user || !$pass) {