PHP Warning: call_user_func() expects parameter 1 to be a valid callback
Confused. Writing a plugin with which I have other callbacks working similarly fine. But when adding a meta box its failing on the callback with error:
callbacks
Get returned variable from a function to add_shortcode function
I’m passing successfully an ajax object to the backend following this (the script in the JS really it does not matters because I’m getting it well):
Using a private method as an action callback from within a class
I have created a class from within which I would like to call a private method (from within the same class) from the __construct method as an action callback.
How to ‘clone’ select metabox options with a callback function?
The question: Here is my metabox array( ‘id’ => ‘all_btns’, ‘name’ => ‘Button Select’, ‘type’ => ‘select’, ‘options’ => array( ‘button’ => ‘Button’, ‘button_red’ => ‘Button Red’, ‘button_yellow’ => ‘Button Yellow’, ), ‘callback’ => ‘metabox_clone_options’, ), I want to clone this options to another metabox array The Solutions: Below are the methods you can try. … Read more
Run function after a post has finished saving – callback function perhaps?
Upon saving a new post (of a certain post type), a given operation has to run. The problem is that the operation is calling an external (slow) API, which means that the (not logget in) end-user might having to wait for 20-30 seconds, upon creating this new post (not good for the user-experience).
How to check if which hook triggered the call to a function?
I have a situation where I have a function hooked to more than one custom hooks.
How to check in the callback function which custom hook triggered the call?
Code works, but warning about call_user_func_array() appears
I’m a newbie to WordPress. I’m trying to make custom page that displays contact info for all users.
I use code snippet provided by THIS POST.
current_shortcode() – detect currently used shortcode
In a plugin class I want to provide simple fields for public data: email, phone number, Twitter etc. The list can be extended.
How to get control choices from $setting object passed to sanitize_callback
Using $wp_customize global object:
How to pass arguments from add_settings_field() to the callback function?
I have a function like this: