How to use posts_where_request filter in WordPress

posts_where_request filter

For use by caching plugins.

To use posts_where_request filter, first you have to register it using add_filter. You can write this code into functions.php of your activated theme or in a custom WordPress Plugin.

We at WePlugins, always prefer to create a custom WordPress Plugin while using hooks so nothing breaks when you update your WordPress Theme in the future.

In the below live example, we have defined a function modify_posts_where_request_defaults which takes 2 parameters and we registered using add_filter. The first parameter posts_where_request is name of the hook, The second parameter modify_posts_where_request_defaults is name of the function which need to be called, third parameter is the priority of calling the hook if same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometime, you have to remove a registered hook so you can use remove_filter to remove posts_where_request filter.

Parameters

Below are the 2 parameters required to use this hook.

• $where: (string) The WHERE clause of the query.
• $query: (WP_Query) The WP_Query instance (passed by reference).

Live Examples

Example 1: Basic Usage

This example demonstrates how to modify the WHERE clause in a WP_Query.

    function weplugins_modify_posts_where_request_defaults($where, $query) {
        // Update the $where variable according to your website requirements and return this variable.
        return $where;
    }
    // Add the filter
    add_filter("posts_where_request", "weplugins_modify_posts_where_request_defaults", 10, 2);
    

Example 2: Conditional Modification

Here, we conditionally modify the WHERE clause based on the query.

    function weplugins_conditional_posts_where_request($where, $query) {
        if ($query->is_main_query() && !is_admin()) {
            // Modify $where based on specific conditions
            $where .= " AND post_status = 'publish'";
        }
        return $where;
    }
    // Add the filter
    add_filter("posts_where_request", "weplugins_conditional_posts_where_request", 10, 2);
    

Example 3: Removing the Filter

To remove the previously added filter, use the following code.

    remove_filter("posts_where_request", "weplugins_modify_posts_where_request_defaults", 10, 2);
    

Please make sure to provide the same callback function name, priority, and number of arguments while removing the hook callback.

Contact Us

If you need any customization or assistance, feel free to contact us.