Generate WooCommerce coupon when comment review is approved - wordpress

Question

I'm trying to generate a coupon code for customer once his review comment in woocommerce product is approved. I have the whole code ready but once comment is approved nothing happen.
My code only works with comment_post hook but not with the comment_unapproved_to_approved hook. Any advice?
function action_comment_post_coupon( $comment, $comment_ID, $comment_approved, $commentdata ) {
if ( isset ( $commentdata['comment_author_email'] ) ) {
// Get author email
$author_email = $commentdata['comment_author_email'];
if ( is_email( $author_email ) ) {
$value = random_int(100000, 999999);
$customer = $comment->comment_author_email;
$coupon_code = $value; // Code
$amount = '20'; // Amount
$discount_type = 'percent'; // Type: fixed_cart, percent, fixed_product, percent_product
$coupon = array(
'post_title' => $coupon_code,
'post_content' => '',
'post_status' => 'draft',
'post_author' => 1,
'post_type' => 'shop_coupon'
);
$new_coupon_id = wp_insert_post( $coupon );
// Add meta
update_post_meta( $new_coupon_id, 'discount_type', $discount_type );
update_post_meta( $new_coupon_id, 'coupon_amount', $amount );
update_post_meta( $new_coupon_id, 'individual_use', 'yes' );
update_post_meta( $new_coupon_id, 'customer_email', $author_email );
update_post_meta( $new_coupon_id, 'product_ids',$product_ids );
update_post_meta( $new_coupon_id, 'exclude_product_ids', '' );
update_post_meta( $new_coupon_id, 'usage_limit', '1' );
update_post_meta( $new_coupon_id, 'expiry_date', strtotime("+14 days") );
update_post_meta( $new_coupon_id, 'apply_before_tax', 'yes' );
update_post_meta( $new_coupon_id, 'free_shipping', 'no' );
unset($product_ids);
}
}
}
add_action( 'comment_unapproved_to_approved', 'action_comment_post_coupon', 10, 4 );

Answer 1

"My code only works with comment_post hook but not with the comment_unapproved_to_approved hook"
As you can see the comment_post hook contains 3 params
/**
* Fires immediately after a comment is inserted into the database.
*
* #since 1.2.0
* #since 4.5.0 The `$commentdata` parameter was added.
*
* #param int $comment_ID The comment ID.
* #param int|string $comment_approved 1 if the comment is approved, 0 if not, 'spam' if spam.
* #param array $commentdata Comment data.
*/
function action_comment_post( $comment_ID, $comment_approved, $commentdata ) {
// Do something
}
add_action( 'comment_post', 'action_comment_post', 10, 3 );
See: do_action( 'comment_post', int $comment_ID, int|string $comment_approved, array $commentdata )
While the comment_unapproved_to_approved hook contains only 1 which is $comment, therefore just changing hookname is not enough.
See: do_action( "comment_{$old_status}_to_{$new_status}", WP_Comment $comment )
So to answer your question you get:
/**
* Fires when the comment status is in transition from one specific status to another.
*
* The dynamic portions of the hook name, `$old_status`, and `$new_status`,
* refer to the old and new comment statuses, respectively.
*
* Possible hook names include:
*
* - `comment_unapproved_to_approved`
* - `comment_spam_to_approved`
* - `comment_approved_to_unapproved`
* - `comment_spam_to_unapproved`
* - `comment_unapproved_to_spam`
* - `comment_approved_to_spam`
*
* #since 2.7.0
*
* #param WP_Comment $comment Comment object.
*/
function action_comment_unapproved_to_approved( $comment ) {
// When isset
if ( isset ( $comment->comment_author_email ) ) {
// Get author email
$author_email = $comment->comment_author_email;
// Is email
if ( is_email( $author_email ) ) {
// Get an emty instance of the WC_Coupon Object
$coupon = new WC_Coupon();
// Generate a non existing coupon code name
$coupon_code = random_int( 100000, 999999 ); // OR generate_coupon_code();
$discount_type = 'percent';
$coupon_amount = '20'; // Amount
// Set the necessary coupon data (since WC 3+)
$coupon->set_code( $coupon_code );
$coupon->set_discount_type( $discount_type );
$coupon->set_amount( $coupon_amount );
$coupon->set_individual_use( true );
$coupon->set_usage_limit( 1 );
$coupon->set_email_restrictions( array( $author_email ) );
$coupon->set_date_expires( strtotime( '+14 days' ) );
$coupon->set_free_shipping( true );
// Create, publish and save coupon (data)
$coupon->save();
}
}
}
add_action( 'comment_unapproved_to_approved', 'action_comment_unapproved_to_approved', 10, 1 );
Note: since WooCommerce 3, your code is a bit outdated. Instead you should better use the available WC_Coupon setter methods.
All information about this can be found via WC_Coupon