add_action insert html

Question

If you want something to display in the footer, you first need to hook it into the footer to display it. So that would look like this:

function myLog() {
    echo 'test';
}
add_action('wp_footer','myLog');

However, this is not at all connected to the data you want, which is when a new user creates a new site. The wpmu_new_blog action is deprecated so use the wp_initialize_site hook instead.

When this hook fires, it will not output information into the footer because it’s processing information. So really, this step is just saving the information somewhere.

/**
 * Function for `wp_initialize_site` action-hook.
 * 
 * @param WP_Site $new_site New site object.
 * @param array   $args     Arguments for the initialization.
 *
 * @return void
 */
function saveLog( $new_site, $args ) {
    // Do something
}
add_action('wp_initialize_site','saveLog',20,2);

Since there are two events happening, that’s why you need to access two hooks. So to put it all together (this is untested, I’m literally just writing this code here)

/**
 * Function for `wp_initialize_site` action-hook.
 * 
 * @param WP_Site $new_site New site object.
 * @param array   $args     Arguments for the initialization.
 *
 * @return void
 */
function saveLog( $new_site, $args ) {

    // Get the info from the newly created site
    $newInfo = array(array(
        'blog_id' => $new_site->get('id'),
        'domain' => $new_site->get('domain')
    ));

    //Get previous log info from the Transients API
    $log = get_transient('new_site_log');
    if(is_array($log)) {
        //Merge if it exists
        $log = array_merge($log,$newInfo); 
    } else {
        //Set new if it doesn't
        $log = $newInfo;
    }
    
    //Save the log to the Transients API
    set_transient('new_site_log',$log,DAY_IN_SECONDS);
}
add_action('wp_initialize_site','saveLog',20,2);

function myLog() {
    //Get the log info from the Transients API
    $log = get_transient('new_site_log');

    //If an array with stuff, loop through it
    if(is_array($log) && count($log)) {
        echo '<ol>';
        foreach($log as i => $siteInfo) {
            // Echo the info we saved
            printf(
                '<li>Blog ID: %s<br />Domain: %s</li>', 
                $siteInfo['blog_id'], 
                $siteInfo['domain']
            );   
        }
        echo '</ol>';
    } else {
        echo 'No new sites were created';
    }
}
add_action('wp_footer','myLog');

This example uses the Transients API to save the info and transients expire, but you can use whatever.

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