I do it like this:
// Inclusion of additional php files
define( 'MYPLUG_DIR', plugin_dir_path( __FILE__ ) );
require_once( MYPLUG_DIR . 'hi.php' );
It lets you use that more easily if you have to include several files.
I do it like this:
// Inclusion of additional php files
define( 'MYPLUG_DIR', plugin_dir_path( __FILE__ ) );
require_once( MYPLUG_DIR . 'hi.php' );
It lets you use that more easily if you have to include several files.