[BUG] Create PTR option causes fatal error: Uncaught Error: [] operator not supported for strings

[imyller]

fM Version : 4.6.1 fmDNS Version : 6.0.3

• Debian 12 (Bookworm)
• PHP 8.2.7
• Apache 2.4.57

In raising this issue, I confirm the following (please check boxes, eg [X]):

• [X] I have read and understood the contributors guide.
• [X] I have checked that the bug-fix I am reporting can be replicated, or that the feature I am suggesting isn't already present.
• [X] I have checked that the issue I'm posting isn't already reported.
• [X] I have checked that the issue I'm posting isn't already solved and no duplicates exist in closed issues and opened issues
• [X] I have checked the pull requests tab for existing solutions/implementations to my issue/suggestion.

---

(BUG | ISSUE) Expected Behavior:

Operation succeeeds and forward A record is created.

(If reverse zone is not already created it can either be created or Create PTR option will be ignored with warning?)

(BUG | ISSUE) Actual Behavior:

• Create PTR option checked for A record
• No manually created reverse zone
• Server responds with http/500:

Fatal error: Uncaught Error: [] operator not supported for strings in /var/www/facileManager/fm-modules/fmDNS/classes/class_zones.php:1850 Stack trace: #0 /var/www/facileManager/fm-modules/fmDNS/classes/class_zones.php(126): fm_dns_zones->validatePost() #1 /var/www/facileManager/fm-modules/fmDNS/functions.php(1312): fm_dns_zones->add() #2 /var/www/facileManager/fm-modules/fmDNS/functions.php(1272): autoCreatePTRZone() #3 /var/www/facileManager/fm-modules/fmDNS/pages/zone-records-validate.php(250): checkPTRZone() #4 /var/www/facileManager/fm-modules/fmDNS/pages/zone-records-validate.php(141): validateEntry() #5 /var/www/facileManager/fm-modules/fmDNS/pages/zone-records-validate.php(69): createOutput() #6 /var/www/facileManager/index.php(57): include('...') #7 {main} thrown in /var/www/facileManager/fm-modules/fmDNS/classes/class_zones.php on line 1850

(BUG | ISSUE) Steps to reproduce:

• Enable Show errors in settings
• Create forward zone (e.g. example.com)
• Do NOT create reverse zone for IP (e.g 10.in-addr.arpa.)
• Try to create A record (e.g. test A 10.0.0.0) with Create PTR option checked
• http/500 error from server

(without Show errors setting, UI responds with blank page and silent http/500)

[WillyXJ]

This is now fixed in fmDNS 6.0.4 and later.