How to use post_updated filter in WordPress

post_updated filter

Fires once an existing post has been updated.

do_action( 'post_updated', int $post_ID, WP_Post $post_after, WP_Post $post_before )

Description

This is an action hook, and it fires once an existing post has been updated. By using this hook, you can get the difference between $post_before and $post_after. It consists of three parameters: $post_ID, which is the post ID, $post_before, and $post_after. Try updating or adding a post, and you should see some output because this is when WordPress calls the hook function. To check for changes, compare the titles from the before and after post objects.

Here’s a basic example:


function weplugins_check_values($post_ID, $post_after, $post_before){
if( $post_after->post_title !== $post_before->post_title ) {
// do something
}
}
add_action( 'post_updated', 'weplugins_check_values', 10, 3 );


Parameters

• $post_ID: (int) Post ID.
• $post_after: (WP_Post) Post object following the update.
• $post_before: (WP_Post) Post object before the update.

Live Examples

Example 1: Basic Usage

To run the hook, copy the example below:

    // run the action 
    do_action( 'post_updated', $post_ID, $post_after, $post_before); 
    

Example 2: Adding a Hook Callback

The following example is for adding a hook callback:

    // define the post_updated callback 
    function weplugins_action_post_updated( $post_ID, $post_after, $post_before ) { 
        // make action magic happen here... 
    }; 
             
    // add the action 
    add_action( 'post_updated', 'weplugins_action_post_updated', 10, 3 );  
    

Example 3: Removing a Hook Callback

To remove a hook callback, use the example below:

    // remove the action 
    remove_action( 'post_updated', 'weplugins_action_post_updated', 10, 3 ); 
    

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