plugin file path code example

Example 1: how to get plugin directory path in wordpress

//current path: /home/user/var/www/wordpress/wp-content/plugins/my-plugin/
$dir = plugin_dir_path( __DIR__ );
//$dir is set to /home/user/var/www/wordpress/wp-content/plugins/

Example 2: how to get plugin directory path in wordpress

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