plugin_dir_path( string $file )

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

Description Description

Parameters Parameters


(string) (Required) The filename of the plugin (__FILE__).

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Return Return

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

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Source Source

File: wp-includes/plugin.php

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

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Changelog Changelog

Version Description
2.8.0 Introduced.

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More Information 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.

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User Contributed Notes User Contributed Notes

  1. Skip to note 1 content
    Contributed by Codex

    Including all PHP files from a plugin sub folder and avoiding adding a unnecessary global just to determine a path that is already available everywhere just using WP core functions.

    foreach ( glob( plugin_dir_path( __FILE__ ) . "subfolder/*.php" ) as $file ) {
        include_once $file;
  2. Skip to note 5 content
    Contributed by Codex

    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' );

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