plugin development - get_object_taxonomies() returns empty array for custom post type

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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)

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)

• custom-post-types
• plugin-development
• custom-taxonomy

Share Improve this question edited Feb 19, 2018 at 20:36 Johansson 15.4k1111 gold badges4343 silver badges7979 bronze badges asked Feb 19, 2018 at 18:12 geeky87geeky87 2144 bronze badges 5

• Are you sure the problem is not a simple typo? – Johansson Commented Feb 19, 2018 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 Commented Feb 19, 2018 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 Commented Feb 20, 2018 at 12:17
• @WebElaine : the problem is that the post types isn't recognizable inside my plugin folder – geeky87 Commented Feb 20, 2018 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 Commented Feb 20, 2018 at 18:27

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1 Answer 1

Sorted by: Reset to default 1

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 ... )

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)

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)

• custom-post-types
• plugin-development
• custom-taxonomy

Share Improve this question edited Feb 19, 2018 at 20:36 Johansson 15.4k1111 gold badges4343 silver badges7979 bronze badges asked Feb 19, 2018 at 18:12 geeky87geeky87 2144 bronze badges 5

• Are you sure the problem is not a simple typo? – Johansson Commented Feb 19, 2018 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 Commented Feb 19, 2018 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 Commented Feb 20, 2018 at 12:17
• @WebElaine : the problem is that the post types isn't recognizable inside my plugin folder – geeky87 Commented Feb 20, 2018 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 Commented Feb 20, 2018 at 18:27

Add a comment  | 

1 Answer 1

Sorted by: Reset to default 1

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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