Get the URL directory path (with trailing slash) for the plugin __FILE__ passed in.

Get the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in.

​The `ms_file_constants()` function in WordPress is used for backward compatibility with legacy file-serving on multisite installations

Learn how to use the WordPress 'plugin_basename()' PHP function in this article, including examples and usage tips

Retrieves a URL within the plugins or mu-plugins directory.

Retrieves plugin installer pages from the WordPress.org Plugins API.

Determines whether the current post is open for pings.

Default filter attached to pingback_ping_source_uri to validate the pingback’s Source URI.

​The `pingback()` function in WordPress is used to notify other websites that their link has been mentioned within a post