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Im seeing WordPress plugins either use plugins_url or plugin_dir_url when creating constants to some of their folders. Is one better than the other?

examples:

define( 'MEMBERS_URI', trailingslashit( plugin_dir_url( __FILE__ ) ) );
define( 'WPACCESS_INC', plugins_url( 'inc', __FILE__ ) , true );
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Note - you don't need to use trailingslashit() for plugin_dir_url() because it already uses it within function. –  amit Aug 13 '12 at 16:00
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1 Answer

up vote 5 down vote accepted

Checkout - wp-includes/plugin.php#L585

plugin_dir_url() function internally uses plugins_url() to get the link to plugin directory.

plugin_dir_url()

This will return url of plugin directory with a trainling slash at the end. So this can be easily used to link to plugin directory.

E.g - http://www.example.com/wp-content/plugins/foo/

plugins_url

If no arguments are passed this will results same as of above function, but with or without trailing slash at end. This can be configured to link to files within plugin directory.

E.g -

plugins_url( 'img/bar.jpg' , __FILE__ ) will return a url like http://www.example.com/wp-content/plugins/foo/img/bar.jpg

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