How to use log_query_custom_data filter in WordPress

Example 1: Basic Hook Registration

Here’s how you can register the log_query_custom_data filter with a simple callback function.

    function weplugins_modify_log_query_custom_data_defaults($query_data, $query, $query_time, $query_callstack, $query_start) { 
        // Customize $query_data according to your needs.
        return $query_data; 
    }
    // Add the filter
    add_filter("log_query_custom_data", "weplugins_modify_log_query_custom_data_defaults", 10, 5);
    

Example 2: Removing the Hook

If you need to remove the filter for some reason, here’s how you can do it.

    remove_filter("log_query_custom_data", "weplugins_modify_log_query_custom_data_defaults", 10, 5);
    

Ensure you use the same callback function name, priority, and number of arguments to successfully remove it.

Example 3: Conditional Data Modification

Adjust the $query_data conditionally based on your site’s needs.

    function weplugins_conditional_modify_query_data($query_data, $query, $query_time, $query_callstack, $query_start) {
        if ($query_time > 1) { // Example condition
            $query_data['slow_query'] = true;
        }
        return $query_data;
    }
    add_filter("log_query_custom_data", "weplugins_conditional_modify_query_data", 10, 5);