Using WordPress ‘is_network_only_plugin()’ PHP function
Checks for “Network: true” in the plugin header to see if this should be activated only as a network wide plugin. The plugin would also work when Multisite is not…
plugins
Using WordPress ‘init()’ PHP function
Set up constants with default values, unless user overrides.
Using WordPress ‘remove_meta_box()’ PHP function
Learn how to remove meta boxes using the WordPress'remove_meta_box()' PHP function in this article with examples
Using WordPress ‘query_posts()’ PHP function
Learn how to use the WordPress 'query_posts()' PHP function to set up The Loop with custom query parameters, and discover why it's recommended to use the 'pre_get_posts' action instead