That’s not what has_action does. has_action is true, if functions are added to fire on that hook. It is not a way to detect do_action calls.
However in that code:
- Nothing was added to the
acf_add_classaction - If something had been added, it still wouldn’t work because the
body_classfilter has already ran. It would either need the ability to see into the future to observe that a filter was added to that hook inpage-intro.php, orpage-intro.phpwould need to make changes several microseconds into the past.
Fundamentally, this approach cannot work because the body class has already been generated and sent to the browser. It cannot be fixed, a brand new solution is necessary
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