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I am using <?php wp_get_attachment_thumb_url( $attachment_id ); ?> to get the url of a thumbnail for a post in Wordpress. However I would like to retrieve the URL of a specific size image. So for example when displaying the post thunmbnail normally you can specify a size, like: <?php the_post_thumbnail( $size, $attr ); ?>. Is it possible to do the same with wp_get_attachment_thumb_url.

Something like: <?php wp_get_attachment_thumb_url( $attachment_id, $size ); ?>?

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You want wp_get_attachment_image_src():

if ( $src = wp_get_attachment_image_src( $attachment_id, $size ) ) {
    echo $src[0]; // URL
    echo $src[1]; // Width
    echo $src[2]; // Height
}
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Here is how to retrieve the URL for a different size of the featured image (post thumbnail). In this example I’m echoing out the “large” size:

<?php echo wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), 'large')[0]; ?>

Works both inside and outside of the loop. (I use this to fill out meta tags in the head for itemprop, Open Graph, etc.)

The [0] at the end is necessary because wp_get_attachment_image_src returns an array, with the first value being the URL.

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