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How to use log_query_custom_data filter in WordPress

Sandeep Kumar Mishra
Sandeep Kumar Mishra
June 17, 2023
5 minutes read

 

log_query_custom_data filterIt’s like when you’re cooking and want to add your secret spice mix to a dish. The log_query_custom_data filter in WordPress lets you tweak the query data just the way you want. But remember, it’s best to add your own flavor in a new spot so you don’t mess up the original taste. You can add this filter to your theme’s functions.php or create a custom plugin. At WePlugins, we always recommend the plugin route to avoid any hiccups during theme updates.

Before diving in, here’s a quick rundown of the parameters you’ll be working with:

  • $query_data: Custom query data in an array.
  • $query: The SQL query as a string.
  • $query_time: Time spent on the query in seconds (float).
  • $query_callstack: Comma-separated list of calling functions (string).
  • $query_start: Start time of the query as a Unix timestamp (float).

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);
    

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Sandeep Kumar Mishra

Sandeep Kumar Mishra

Sandeep Kumar Mishra writes about WordPress and Artificial Intelligence, offering tips and guides to help you master your website and stay updated with the latest tech trends.

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