I have a custom post type with only 3 custom fields in it. $post_types = get_post_meta($post->ID,'post_types',true); $post_taxonomies = get_post_meta($post->ID,'post_taxonomies',true); ...
I have a function that defines a custom field on a post type. Say the field is "subhead". When the post is saved, I want to do some validation on the input, and display an error message on the post ...