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I want caching all images on my site and prevent the browser download the images all times, so I would like add an version query tag to all images (for example: ?v=20160505)

How can I add this for image urls? Now I use this code to show images in my theme:

echo get_the_post_thumbnail( $thumbnail->ID, 'thumbnail' );
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    May I ask why? A image is not dinamic by definition.
    – cybmeta
    May 5, 2016 at 21:41
  • @cybmeta, extremely rare but might happen (delete image, upload another under the same name. IIRC edit image can also cause that) May 6, 2016 at 8:52

1 Answer 1

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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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    +1 but probably better to use file modification time than hardcoding a version number May 6, 2016 at 8:54
  • You want to do it because browsers cache images. If the version or attribute changes, the browser will update the image. This is quite handy if you have uploaded a new version with the same filename.
    – Trond
    Feb 2 at 9:00

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