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I just want to know why get_object_taxonomies('custom-post-type-name') return empty array for custom post types but works fine with post as argument : get_object_taxonomies('post') and returns:

array (size=3)
  0 => string 'category' (length=8)
  1 => string 'post_tag' (length=8)
  2 => string 'post_format' (length=11)
  • Are you sure the problem is not a simple typo? – Jack Johansson Feb 19 '18 at 20:36
  • Where are you using this code? Perhaps you're outside of the Loop so there is no object it's running on? – WebElaine Feb 19 '18 at 21:42
  • @JackJohansson I found the cause of this issue : the problem is that the post types isn't recognizable inside my plugin folder :/any idea ? – geeky87 Feb 20 '18 at 12:17
  • @WebElaine : the problem is that the post types isn't recognizable inside my plugin folder – geeky87 Feb 20 '18 at 12:18
  • As you mentioned the function works fine with an argument - have you tried passing one of the CPTs as an argument to see if that works? Hard to help without further context about where and how this code is running. – WebElaine Feb 20 '18 at 18:27
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I have run into the same issue. I believe the root cause is the order of execution. For the sake of experiment, I ran get_object_taxonomies() immediately after register_taxonomy(), in fact in the same function and it worked as expected. So what to do? Use add_action() hook to execute get_object_taxonomies() after register_taxonomy(). The correct order of execution can be guaranteed via 3rd argument of add_action( ... int $priority = 10 ... )

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