wordpress local plugin folder path code example

Example 1: how to get plugin directory path in wordpress

define( 'MY_PLUGIN_PATH', plugin_dir_path( __FILE__ ) );
include( MY_PLUGIN_PATH . 'includes/admin-page.php');
include( MY_PLUGIN_PATH . 'includes/classes.php');
// etc.

Example 2: how to get plugin directory path in wordpress

$dir = plugin_dir_path( __FILE__ );
// Example: /home/user/var/www/wordpress/wp-content/plugins/my-plugin/