How to use posts_selection action in WordPress

posts_selection action

Hey there! If you’re working with caching plugins in WordPress, the `posts_selection` action is something you’ll likely find handy. Let’s dive into how you can use this hook effectively.

When working with hooks, always remember to register them using `add_action`. You can place this code in your theme’s `functions.php` file or, as many prefer (including us at WePlugins), in a custom WordPress Plugin. This way, nothing breaks when you update your WordPress theme.

In the example below, we’ll define a function `weplugins_execute_on_posts_selection_event` that takes one parameter. We’ll register this function using `add_action`. Here’s a breakdown:

1. The first parameter `posts_selection` is the name of the hook.
2. The second parameter `weplugins_execute_on_posts_selection_event` is the name of the function to be called.
3. The third parameter is the priority of calling the hook if the same hook is used multiple times.
4. The last parameter is the number of arguments (if any) to be passed to the registered function.

Sometimes, you might need to remove a registered hook, and for that, you can use `remove_action`.

Parameters

Below is the 1 parameter required to use this hook:

• $selection: (string) The assembled selection query.

Live Example

Example 1: Basic Usage

Here’s a simple example of how you can use this hook:

    function weplugins_execute_on_posts_selection_event($selection){
        // Your custom code here
    }
    // add the action
    add_action("posts_selection", "weplugins_execute_on_posts_selection_event", 10, 1);
    

Example 2: Advanced Usage

This example shows how to manipulate the selection query:

    function weplugins_modify_selection_query($selection){
        // Modify the selection query
        $selection .= " AND post_status = 'publish'";
        return $selection;
    }
    // add the action
    add_action("posts_selection", "weplugins_modify_selection_query", 10, 1);
    

Example 3: Removing the Action

To remove a hook callback, use the example below:

    remove_action("posts_selection", "weplugins_execute_on_posts_selection_event", 10, 1);
    

Make sure you provide the same callback function name, priority, and number of arguments while removing the hook callback.

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