Unable to get WooCoommerce product variation id - php

Question

I am trying to update a specific field for all variations in a product, but unfortunately, I am unable to get variation ids to go further.
Basically what I am doing is, I am trying to get each variation's stock value and if the stock value is less than zero, then I am updating a particular field with certain values (as mentioned in my code below).
I have tested this by manually inputting any custom post / variation id and is working fine, updates that particular variation id based on its stock value. All I am stuck here is I am unable to fetch the variation id by itself.
Below is the code that I am using:
global $post, $woocommerce;
$post_id = $variation->ID;
// Get specific data from the certain custom fields using get_post_meta( $post_id, $key, $single );
$stock = get_post_meta( $post_id, '_stock', true );
if ($stock < 1) {
update_post_meta( $post_id, 'cuzd-prod-general-v', '20,25' );
} else {
update_post_meta( $post_id, 'cuzd-prod-general-v', '1,5' );
}
I don't know where I am wrong to get the variation ids for this.

Answer 1

I was able to solve this by using below code changes:
// Values to be updated
$in_stock = '1,5';
$out_of_stock = '20,30';
// Get variations
$args = array(
'post_type' => 'product_variation',
'post_status' => array( 'private', 'publish' ),
'numberposts' => -1,
'orderby' => 'menu_order',
'order' => 'asc',
'post_parent' => $post->ID
);
$variations = get_posts( $args );
foreach ( $variations as $variation ) {
$variation_id = absint( $variation->ID );$variable_id = $this['variation_id'];
$variation_post_status = esc_attr( $variation->post_status );
$variation_data = get_post_meta( $variation_id );
$variation_data['variation_post_id'] = $variation_id;
// Get specific data from the certain custom fields using get_post_meta( $post_id, $key, $single );
$stock = get_post_meta( $variation_data['variation_post_id'], '_stock', true );
if ($stock < 1) {
update_post_meta( $variation_data['variation_post_id'], 'cuzd-prod-general-v', $out_of_stock );
} else {
update_post_meta( $variation_data['variation_post_id'], 'cuzd-prod-general-v', $in_stock );
}
}