Don’t know why you want to do it when there’s update_post_thumbnail_cache()
in WordPress and set expire headers on server side. But you can try this in your functions.php
:
add_filter('wp_get_attachment_image_src', function($img, $id, $size, $icon) {
$img[0] = $img[0] . '?v={$some_version}';
return $img;
}, PHP_INT_MAX, 4);
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