Hot answers tagged custom-field
If you wanna show or hide entire meta box when event date is change, you can try to use Conditional Logic plugin, so you can rewrite your code like so: $meta_boxes = array( 'id' => 'wr_event_review', 'title' => 'Event Review', 'pages' => array( 'wr_event', ), // Post type 'context' => 'normal', ...
Plugins that load the WordPress environment this way get rejected from the repository, as they are prone to failure in non-standard configurations. For something like this I would use the admin-post-$action to receive requests. The WordPress API will be available where you can check if users are authorized to perform specific actions.
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