Check if variables are set before trying to pass them to function substr_count to avoid generating PHP alerts.
Ticket #4418 make sure the dns_split is separated with spaces rather than space or comma to comply with strongswan requirements.
When RADIUS auth is selected, radius protocol and server ip/host are mandatory. Fixes #4384
isset is a better check here
Merge pull request #1494 from k-paulius/ntp-rrd-fix
Merge pull request #1479 from surrural/master
Merge pull request #1492 from PiBa-NL/carp-statusicon
Ticket #4445 do not write config and remove its cache when applying settings its just behaviour from dinosaur era and should have been cleanded long time ago.
Add support for DNSimple (dnsimple.com)
Merge pull request #1497 from phil-davis/patch-2
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