get_plugin_directory url code example

Example 1: how to get plugin directory path in wordpress

foreach ( glob( plugin_dir_path( __FILE__ ) . "subfolder/*.php" ) as $file ) {
    include_once $file;
}

Example 2: how to get plugin directory path in wordpress

function plugin_dir_path( $file ) {
    return trailingslashit( dirname( $file ) );
}