Add multiple images to WooCommerce product - wordpress

Question

How can I assign multiple images to a product in WooCommerce?
I've tried:
update_post_meta( $post_id, '_product_image_gallery', $image_id);
but it assigns only one image. When I use an array, it does not work:
update_post_meta( $post_id, '_product_image_gallery', array($image_id,$image_id2));

Answer 1

If you have multiple images that need to be assigned to a product, you will need to assign one image as the featured image/thumbnail, and then assign the rest of the images as the product gallery thumbnails.
Below is a quick function that can achieve this for you:
function so_upload_all_images_to_product($product_id, $image_id_array) {
//take the first image in the array and set that as the featured image
set_post_thumbnail($product_id, $image_id_array[0]);
//if there is more than 1 image - add the rest to product gallery
if(sizeof($image_id_array) > 1) {
array_shift($image_id_array); //removes first item of the array (because it's been set as the featured image already)
update_post_meta($product_id, '_product_image_gallery', implode(',',$image_id_array)); //set the images id's left over after the array shift as the gallery images
}
}
Assuming you have an array of image id's, and the id of the product that you want to attach the images to, you can call the function above like this:
$images = array(542, 547, 600, 605); //array of image id's
so_upload_all_images_to_product($product_id, $images);
If you are working with a massive array of product images, or you are very serious about micro-optimisation, you can use a combination of array_reverse and array_pop instead of array_shift.

Answer 2

Try like this:
update_post_meta( $post_id, '_product_image_gallery', $image_id.",". $image_id2);
Example to complete:
$images_ids = array();
$images_meta = "";
foreach ($images_ids as $im_id) {
if (is_null(get_post_meta($post_id,"_product_image_gallery")))
add_post_meta($post_id,"_product_image_gallery",$im_id);
else {
$images_meta = get_post_meta($post_id,"_product_image_gallery",true);
update_post_meta($post_id,"_product_image_gallery",$images_meta.",".$im_id);
}

Answer 3

Here is a little wrapper for this job. It accepts only one attachment and adds it either as the base image or adds to the gallery if the product has a base image already.
/**
* #param $product WC_Product|WP_Post
* #param $attachmentId int
*/
function setOrAddImageToProduct($product, $attachmentId)
{
if(!has_post_thumbnail($product->ID)) {
set_post_thumbnail( $product, $attachmentId );
} else {
$gallery = get_post_meta($product->ID, '_product_image_gallery');
if(!empty($gallery)) {
$galleryItems = explode(",", $gallery);
$galleryItems[] = $attachmentId;
} else {
$galleryItems = [$attachmentId];
}
update_post_meta($product->ID, '_product_image_gallery', join(',', $galleryItems));
}
//Adds connection to the product for the media view
$attachment = get_post( $attachmentId );
$attachment->post_parent = $product->ID;
wp_update_post( $attachment );
}

Answer 4

This code will upload multiple images in product gallery
foreach ($files['name'] as $key => $value) {
if ($files['name'][$key]) {
$file = array(
'name' => $files['name'][$key],
'type' => $files['type'][$key],
'tmp_name' => $files['tmp_name'][$key],
'error' => $files['error'][$key],
'size' => $files['size'][$key]
);
$_FILES = array ("my_file_upload" => $file);
$newupload = my_handle_attachment( "my_file_upload", $post_id);
}
$attach_newupload_ids[]=$newupload;
}
$attach_ids=implode(',',$attach_newupload_ids);
if($attach_ids){
update_post_meta( $post_id, '_product_image_gallery', $attach_ids);
}

Answer 5

This code will update the product gallery when a new image is loaded to the product. I', using it in a React app that uses wp as back-end, the new image is loaded trough the app and then the hook "add action" triggers the code that includes the image into the product gallery.
I use this code in the functions.php file:
<?php
add_action( 'add_attachment', 'auto_on_upload' );
function auto_on_upload( $attachment_id ) {
$parent = get_post_ancestors( $attachment_id );
$images = get_attached_media('', $parent[0]);
foreach( $images as $key => $image) {
$images_array[] = $key;
};
$images_array[] = $attachment_id;
update_post_meta($parent[0], '_product_image_gallery', implode(',', $images_array));
}
?>