Fix: Broken multi-level (nested) associative array values after getting submitted from checkout page

[ratnakardubey]

Issue: #306

---

Description

Instead of processing the submitted values using explode used a PHP function parse_str which can handle multi-level (nested) associative arrays.

Steps to test:

1. Copy & paste the following block of code at the end of the file functions.php of child theme of your website

/**
 * Add some HTML input fields on the checkout page
 *
 * @return void
 */
function ratnakar_custom_checkout_array_fields() {
	for ( $i = 0; $i < 3; $i++ ) {
		for ( $j = 0; $j < 2; $j++ ) {
			?>
			<input type="hidden" name="ratnakar_input[field_<?php echo esc_attr( $i ); ?>][]" value="ratnakar_input_value_<?php echo esc_attr( $i . '_' . $j ); ?>">
			<?php
		}
	}
}
add_action( 'woocommerce_checkout_after_customer_details', 'ratnakar_custom_checkout_array_fields' );

/**
 * Process the submitted values on the checkout page
 *
 * @return void
 */
function ratnakar_custom_checkout_processed_array_fields() {
	$logger  = wc_get_logger();
	$context = array( 'source' => 'ratnakar' );
	ob_start();
	var_dump( $_REQUEST );
	$logger->log( 'debug', 'ratnakar_input: ' . ob_get_clean() . ' ' . __FILE__ . ' ' . __LINE__, $context );
}
add_action( 'woocommerce_new_order', 'ratnakar_custom_checkout_processed_array_fields' );

2. Save the functions.php file
3. Now, go to the website, add a product to cart, navigate to the checkout page
4. On the checkout page, select PayPal Payments & click on the yellow button of the PayPal
5. Go to WooCommerce > Status > Logs
6. Look in the dropdown menu for log file name starting with 'ratnakar'
7. Click on the View button to open the log
8. Go through the submitted form values, especially for the field ratnakar_input. You'll notice the square box that represents an array has become the part of the array key as string

Result

After applying this fix, the submitted form values will be formatted correctly, as shown in the attached screenshot

Comparison in the results before & after applying the fix

Documentation

Don't think that this PR will require any change in the documentation

Changelog entry

Fix: Broken multi-level (nested) associative array values after getting submitted from checkout page

Closes #306

[Dinamiko]

Hello @ratnakardubey,

Thanks for the PR, I´ve checked and it looks good. When you have time can you please rename the file to CreateOrderEndpoint.php? (we have just changed class names to follow PSR-4). Once renamed we´ll merge this PR to trunk.

[Dinamiko]

Rename file from class-createorderendpoint.php to CreateOrderEndpoint.php.

[ratnakardubey]

Hey @Dinamiko,

Thank you for your feedback.

I've pushed a new commit in the same PR as you suggested.