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plugin_dir_url( string $file )

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

Parameters

$file

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

Return

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

Source

File: wp-includes/plugin.php 

function plugin_dir_url( $file ) {
	return trailingslashit( plugins_url( '', $file ) );
}

Uses

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

Appends a trailing slash.
wp-includes/link-template.php: plugins_url()

Retrieves a URL within the plugins or mu-plugins directory.

Changelog

Version Description
2.8.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/plugin_dir_url