How to Debug Custom Shipping Methods in WooCommerce 3 ?

Debugging in WooCommerce 3 : Uncovering the Mystery

When creating custom shipping methods for WooCommerce, accurate debugging is crucial. However, as mentioned in the user's query, a simple console.log() echo may not yield any results. This is because we're dealing with a background process running on the server side.

WC Logger to the Rescue

WooCommerce provides a powerful tool for debugging: the WC_Logger class. This enables us to log messages to specific WooCommerce logs, rather than relying on potentially unreliable JavaScript methods.

1. Accessing Logs: You can conveniently access WooCommerce error logs by navigating to WooCommerce > System Status > Logs. Here, you can view log files that contain detailed debugging information.

2. Logging with WC_Logger: To log messages:

   $log = new WC_Logger();
   $log->log('new-woocommerce-log-name', $log_entry);

   Use appropriate severity levels, such as 'debug' or 'info,' to categorize your messages.

Alternative: WordPress Debug Log

Alternatively, you can leverage the WordPress debug log:

1. Enable Debug: Add the following to wp-config.php:

   define('WP_DEBUG', true);
   define('WP_DEBUG_LOG', true);
   define('WP_DEBUG_DISPLAY', false);

2. Log with error_log(): Use:

   error_log(print_r($variable, true));

   to display variables in the debug log file: wp-content/debug.log.

Note: WC_Logger methods have been updated since WooCommerce 3, enabling grouping of logs by context and severity. Utilize the log() method instead of the add() method to avoid deprecation issues.

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