Using my own code from here, i updated the logic to add the name of the image size instead of the suffix, try adding this to your functions.php file:
add_filter("wp_image_editors", "my_wp_image_editors");
function my_wp_image_editors($editors) {
array_unshift($editors, "WP_Image_Editor_Custom");
return $editors;
}
// Include the existing classes first in order to extend them.
require_once ABSPATH . WPINC . "/class-wp-image-editor.php";
require_once ABSPATH . WPINC . "/class-wp-image-editor-gd.php";
class WP_Image_Editor_Custom extends WP_Image_Editor_GD {
public function generate_filename($suffix = null, $dest_path = null, $extension = null) {
// $suffix will be appended to the destination filename, just before the extension
if (!$suffix) {
$suffix = $this->get_suffix();
}
$dir = pathinfo($this->file, PATHINFO_DIRNAME);
$ext = pathinfo($this->file, PATHINFO_EXTENSION);
$name = wp_basename($this->file, ".$ext");
$new_ext = strtolower($extension ? $extension : $ext );
if (!is_null($dest_path) && $_dest_path = realpath($dest_path)) {
$dir = $_dest_path;
}
//we get the dimensions using explode, we could have used the properties of $this->file[height] but the suffix could have been provided
$size_from_suffix = explode("x", $suffix);
//we get the slug_name for this dimension
$slug_name = $this->get_slug_by_size($size_from_suffix[0], $size_from_suffix[1]);
return trailingslashit($dir) . "{$name}-{$slug_name}.{$new_ext}";
}
function get_slug_by_size($width, $height) {
// Make thumbnails and other intermediate sizes.
$_wp_additional_image_sizes = wp_get_additional_image_sizes();
$image_sizes = array(); //all sizes the default ones and the custom ones in one array
foreach (get_intermediate_image_sizes() as $s) {
$image_sizes[$s] = array('width' => '', 'height' => '', 'crop' => false);
if (isset($_wp_additional_image_sizes[$s]['width'])) {
// For theme-added sizes
$image_sizes[$s]['width'] = intval($_wp_additional_image_sizes[$s]['width']);
} else {
// For default sizes set in options
$image_sizes[$s]['width'] = get_option("{$s}_size_w");
}
if (isset($_wp_additional_image_sizes[$s]['height'])) {
// For theme-added sizes
$image_sizes[$s]['height'] = intval($_wp_additional_image_sizes[$s]['height']);
} else {
// For default sizes set in options
$image_sizes[$s]['height'] = get_option("{$s}_size_h");
}
if (isset($_wp_additional_image_sizes[$s]['crop'])) {
// For theme-added sizes
$image_sizes[$s]['crop'] = $_wp_additional_image_sizes[$s]['crop'];
} else {
// For default sizes set in options
$image_sizes[$s]['crop'] = get_option("{$s}_crop");
}
}
$slug_name = ""; //the slug name
if($width >= $height){
foreach ($image_sizes as $slug => $data) { //we start checking
if ($data['width'] == $width) {//we use only width because regardless of the height, the width is the one used for resizing in all cases with crop 1 or 0
$slug_name = $slug;
}
/*
* There could be custom added image sizes that have the same width as one of the defaults so we also use height here
* if there are several image sizes with the same width all of them will override the previous one leaving the last one, here we get also the last one
* since is looping the entire list, the height is used as a max value for non-hard cropped sizes
* */
if ($data['width'] == $width && $data['height'] == $height) {
$slug_name = $slug;
}
}
}else{
foreach ($image_sizes as $slug => $data) {
if ($data['height'] == $height) {
$slug_name = $slug;
}
if ($data['height'] == $height && $data['width'] == $width ) {
$slug_name = $slug;
}
}
}
return $slug_name;
}
}
i also removed the unnecessary code, this will also work with custom image sizes, as can be seen here:
home-bottom is a custom image size i have.