Créer un widget de dashboard WordPress

<?php

function custom_dashboard_contact_widget(){
    wp_add_dashboard_widget(
        'dashboard_widget_recent_contact',
        __('Messages via formulaire de contact', 'theme'),
        'custom_dashboard_contact_widget_content',
        $control_callback = null
    );
}
add_action('wp_dashboard_setup', 'custom_dashboard_contact_widget');

function custom_dashboard_contact_widget_content() {
    $args = array(
        'post_type' => 'contact',
        'orderby' => 'date',
        'order' => 'DESC',
        'numberposts' => 5
    );

    $contacts = get_posts($args);

    echo '<ol id="dash_widget_contacts">';

    foreach ($contacts as $index=>$contact) {

        $title_array = explode(' | ', $contact->post_title);
        $name = $title_array[0];
        $email = $title_array[1];
        $message = $contact->post_content;

        echo '<li>';
        echo '<h4>';
        echo $name . ' <small><em><a href="mailto:' . $email . '">' . $email . '</a></em></small>';
        echo '</h4>';

        echo '<p>' . $message . '</p>';
        echo '</li>';

    }

    echo '</ol>';
}