How can I find the ‘public absolute’ path of a file?

Assuming your resource is included in your Plugin:

  • plugins_url() is the URL to \wp-content\plugins\ (Codex ref)

So if you have a .js file in \wp-content\plugins\plugin-slug\file.js:

<?php echo plugins_url() . '\plugin-slug\file.js'; ?>

BUT WAIT!!

If your purpose is actually to load a javascript file, you actually want to enqueue that file, using wp_enqueue_script(), hooked into the wp_enqueue_scripts hook.

And wp_enqueue_script() uses the filepath rather than the URL, so you could use dirname(___FILE___) if that’ what you’re comfortable with.

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