Wordpress remove extra image sizes

dhn-remove-extra-image-sizes.php

<?php
add_filter( 'intermediate_image_sizes', function ( $sizes ) {
	// keep only 'thumbnail', 'medium', 'large'
  $targets = ['medium_large', '1536x1536', '2048x2048','shop_thumbnail', 'shop_single', 'shop_catalog', 'woocommerce_thumbnail', 'woocommerce_single', 'woocommerce_gallery_thumbnail'];

  foreach($sizes as $size_index=>$size) {
    if(in_array($size, $targets)) {
      unset($sizes[$size_index]);
    }
  }

  return $sizes;
}, 10, 1);

Vice versa, i prefer this.

add_filter( 'intermediate_image_sizes', function ( $sizes ) {
  $allowed_sizes = ['thumbnail', 'medium'];
  $sizes = array_intersect($sizes, $allowed_sizes);
  return $sizes;
}, 10, 1);