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Add image to product gallery programmatically - woocommerce .Woocommerce manage field ‘_product_image_gallery’ with id of images separatly for comma.
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13tjc commented Oct 25, 2017

I have a similar set up but only one attachment ID gets placed in the product image gallery.
Heres what I got:

$commaList = "2104,2105,2106,";
update_post_meta( $post_id, '_product_image_gallery', $commaList);

Are you sure this works to add images to the product gallery programmatically?

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m-torin commented Aug 8, 2018

Works for me:
$media = get_attached_media('image', $pid);
update_post_meta($pid, '_product_image_gallery', implode(',', array_keys($media)));

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