plugin_dir_path( string $file ): string

Get the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in.


The filename of the plugin (__FILE__).


string the filesystem path of the directory that contains the plugin.

More Information

It is a wrapper for trailingslashit( dirname( $file ) );.

The “plugin” part of the name is misleading – it can be used for any file, and will not return the directory of a plugin unless you call it within a file in the plugin’s base directory.


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



User Contributed Notes

  1. Skip to note 13 content

    Conditional loading

    It is sometimes efficient to conditionally load files, e.g., admin-only (or even by specific admin screen):

    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' );
  2. Skip to note 14 content

    If you use this function, you can as well just use trailingslashit( __DIR__ ). There is literally no point at all in using the wrapper.

    This is NOT a pendant to what it “pretends” to be (get_template_directory), and it is a big negligence that such pendant simply does not exist for plugins.

    One has to either use trailingslashit( WP_PLUGIN_DIR . '/your-plugin' ) to get the pendant of get_template_directory in a plugin, or create a custom function, if you do not want to use a constant.

  3. Skip to note 15 content

    define( 'PREFIX_BASE_PATH', plugin_dir_path( __FILE__ ) );
    define( 'PREFIX_ASSETS_URL', plugins_url( '/assets', __FILE__ ) );

    use constant ‘PREFIX_BASE_PATH to include files in functions and files, e.g.,
    include( PREFIX_BASE_PATH . 'inc/init.php' );

    use constant: ‘PREFIX_ASSETS_URL’ to load assets via url (like; js, css, and images). e.g.,
    wp_register_style( 'prefix_library', PREFIX_ASSETS_URL . '/dir/lib.css' );

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