is_post_type_hierarchical()
Whether the post type is hierarchical.
WordPress File wp-includes/post.php
is_post_type_viewable()
Determines whether a post type is considered “viewable”.
is_sticky()
Determines whether a post is sticky.
post_type_exists()
Determines whether a post type is registered.
post_type_supports()
Check a post type’s support for a given feature.
register_post_meta()
Registers a meta key for posts.
register_post_status()
Register a post status. Do not use before init.
register_post_type()
Registers a post type.
remove_post_type_support()
Remove support for a feature from a post type.
sanitize_post()
Sanitizes every post field.