wordpress get path to plugin code example

Example 1: how to get plugin directory path in wordpress

if ( is_admin() ) {
    include_once( plugin_dir_path( __FILE__ ) . 'includes/admin-functions.php' );
} else {
    include_once( plugin_dir_path( __FILE__ ) . 'includes/front-end-functions.php' );
}

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/