+ /**
+ * Fires before a particular screen is loaded.
+ *
+ * The load-* hook fires in a number of contexts. This hook is for plugin screens
+ * where a callback is provided when the screen is registered.
+ *
+ * The dynamic portion of the hook name, `$page_hook`, refers to a mixture of plugin
+ * page information including:
+ * 1. The page type. If the plugin page is registered as a submenu page, such as for
+ * Settings, the page type would be 'settings'. Otherwise the type is 'toplevel'.
+ * 2. A separator of '_page_'.
+ * 3. The plugin basename minus the file extension.
+ *
+ * Together, the three parts form the `$page_hook`. Citing the example above,
+ * the hook name used would be 'load-settings_page_pluginbasename'.
+ *
+ * @see get_plugin_page_hook()
+ *
+ * @since 2.1.0
+ */
+ do_action( 'load-' . $page_hook );