I'm receiving the following filemtime() warning:

Warning: filemtime(): stat failed for https://testing.local/wp-content/plugins/test-social-icons/css/style.css in /app/public/wp-content/plugins/zoo-social-icons/zoo-social-icons.php on line 29

Here's how I'm enqueuing the stylesheet within my plugin:

function test_styles_scripts() {
   $dir = plugin_dir_url(__FILE__);
   wp_enqueue_style( 'test-style', $dir . 'css/style.css', array(), filemtime( $dir . 'css/style.css' ) );
add_action( 'wp_enqueue_scripts', 'test_styles_scripts' );

The stylesheet is correctly enqueuing. Why am I getting this warning?

  • 3
    Sally's comment here was that the first plugin_dir_path() needed to be plugin_dir_url(). The second one, for filemtime(), still needs to be plugin_dir_path(), because filemtime() requires a path, not a URL, but the browser requires a URL, which is what the first one is for. Mar 11, 2020 at 13:57
  • Boom, that works! Thank you @JacobPeattie. Please post your answer and I'll mark it as accepted.
    – Sam
    Mar 11, 2020 at 14:06

1 Answer 1


Restating the answer from @JacobPeattie in the comments above.

filemtime() requires a path, not a URL

Therefore use plugin_dir_path(__FILE__).

The full string for properly printing the cache-busting part of the version number at the end of the asset would be filemtime( plugin_dir_path(__FILE__)

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