Getting Warning on PHPCS run.
$ phpcs --standard=PHPCompatibility --extensions=php,module,inc,install,test,profile,theme --runtime-set testVersion 7.2 fullcalendar
FILE: contrib\fullcalendar\fullcalendar.module
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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252 | WARNING | Since PHP 7.0, functions inspecting arguments, like func_get_args(), no longer report the original value as passed to a parameter, but will instead provide the current value. The parameter "$view_name" was used, and possibly changed (by reference), on line 247.
Closed: outdated
2.0
Code
The issue particularly affects sites running on PHP version 7.2.0 or later.
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
I've volunteered to help clean up the FullCalendar issue queue. As part of that effort I'm closing issues open for unsupported versions of the module as "Closed (outdated)". That includes any Drupal 7-compatible versions because no active maintainer is supporting them.
If this issue is still relevant for version 3.x of FullCalendar, then feel free to re-open it and update the issue version number.