plugin_dir_path( string $file )

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

Parameters

$file

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

Return

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

Source

File: wp-includes/plugin.php 

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

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Related

Uses

Uses
Uses Description
wp-includes/formatting.php: trailingslashit()

Appends a trailing slash.

Changelog

Changelog
Version Description
WP-2.8.0 Introduced.