Adds an "image_size" argument to get_avatar_data so that avatar image sizes can be defined by the image size name in WordPress

avatar_data_image_size_arg.php

<?php
// Adds an "image_size" argument to get_avatar_data so that avatar image sizes
// can be defined by the image size name (requires the get_image_sizes function)
// (https://gist.github.com/kodie/19d027d2c0e2297d1e09b7b71505e774)
// Example: get_avatar_url($user_id, array('image_size' => 'thumbnail'));
add_filter('pre_get_avatar_data', 'avatar_data_image_size_arg', 10, 2);
function avatar_data_image_size_arg($args, $id_or_email) {
  if (isset($args['image_size'])) {
    if ($size = get_image_sizes($args['image_size'])) {
      $args['height'] = $size['height'];
      $args['width'] = $size['width'];
    }
  }

  return $args;
}
?>