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+<?php
+/*
+Plugin Name: Sample Plugin
+Plugin URI: http://yourls.org/
+Description: Sample plugin to illustrate how actions and filters work. Read its source. Refer to the <a href="http://yourls.org/pluginapi">Plugin API documentation</a> for more details.
+Version: 0.1
+Author: Ozh
+Author URI: http://ozh.org/
+*/
+
+// No direct call
+if( !defined( 'YOURLS_ABSPATH' ) ) die();
+
+/* Example of an action
+ *
+ * We're going to add an entry to the menu.
+ *
+ * The menu is drawn by function yourls_html_menu() in file includes/functions-html.php.
+ * Right before the function outputs the closing </ul>, notice the following function call:
+ * yourls_do_action( 'admin_menu' );
+ * This function says: "hey, for your information, I've just done something called 'admin menu', thought I'd let you know..."
+ *
+ * We're going to hook into this action and add our menu entry
+ */
+ 
+yourls_add_action( 'admin_menu', 'ozh_sample_add_menu' );
+/* This says: when YOURLS does action 'admin_menu', call function 'ozh_sample_add_menu'
+ */
+
+function ozh_sample_add_menu() {
+	echo '<li><a href="https://cyne.cf">Main Site</a></li>';
+}
+/* And that's it. Activate the plugin and notice the new menu entry.
+ */
+
+ 
+
+/* Example of a filter
+ *
+ * We're going to modify the <title> of pages in the admin area
+ *
+ * The <title> tag is generated by function yourls_html_head() in includes/functions-html.php
+ * Notice the following function call:
+ * $title = yourls_apply_filter( 'html_title', 'YOURLS: Your Own URL Shortener' );
+ * This function means: give $title the value "YOURLS: Your Own URL Shortener", unless a
+ * filter modifies this value.
+ *
+ * We're going to hook into this filter and modify this value.
+ */
+ 
+yourls_add_filter( 'html_title', 'ozh_sample_change_title' );
+/* This says: when filter 'html_title' is triggered, send its value to function 'ozh_sample_change_title'
+ * and use what this function will return.
+ */
+ 
+function ozh_sample_change_title( $value ) {
+	$value = $value . ' -- the sample plugin is activated';
+	return $value; // a filter *always* has to return a value
+}
+/* And that's it. Activate the plugin and notice how the page title changes */
+