Ejemplo de plugin con Cron

<?php

/**
 * Plugin Name: P&P Filemaker Integration
 * Description: Maneja la sincronización entre Filemaker y el perfil de los usuarios
 * Version:     0.0.1
 * Author:      Felipe Castilla
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly.
}

// Define constants.
define( 'FILEMAKER_INTEGRATION_PLUGIN_VERSION', '0.0.1' );
define( 'FILEMAKER_INTEGRATION_PLUGIN_DIR', untrailingslashit( plugin_dir_path( __FILE__ ) ) );

// Include the main class.
require FILEMAKER_INTEGRATION_PLUGIN_DIR . '/FileMaker.php';

// Main instance of plugin.
function FileMakerInit() {
    return \PyP\FileMaker\FileMaker::getInstance();
}

/*
 * Enqueue Scripts for user-edit page
 */
function enqueueUserEditScript($hook) {
    if ('user-edit.php' !== $hook) {
        return;
    }
    wp_enqueue_script('pyp-rut-validator', plugin_dir_url(__FILE__) . '/assets/rut.js', null,FILEMAKER_INTEGRATION_PLUGIN_VERSION,true);
    wp_enqueue_script('pyp-user-edit', plugin_dir_url(__FILE__) . '/assets/user-edit.js', array('jquery'),FILEMAKER_INTEGRATION_PLUGIN_VERSION,true);
}
add_action('admin_enqueue_scripts', 'enqueueUserEditScript');


/*
 * On plugin activation schedule our bot
 */
register_activation_hook( __FILE__, 'scheduleBot' );
function scheduleBot(){
    $timestamp = wp_next_scheduled( 'pyp_scan_filemaker_files' );
    if( $timestamp == false ){
        wp_schedule_event( time(), 'each_hour', 'pyp_scan_filemaker_files' );
    }
}
register_deactivation_hook( __FILE__, 'descheduleBot' );
function descheduleBot(){
    wp_clear_scheduled_hook( 'pyp_scan_filemaker_files' );
}

/*
 * To add a new schedule time interval (each hour)
 */
add_filter( 'cron_schedules', 'pyp_each_hour_schedule' );
function pyp_each_hour_schedule( $schedules ) {
    $schedules['each_hour'] = array(
        'interval' => 60 * MINUTE_IN_SECONDS,
        'display' => __( 'each hour', 'pyp-filemaker-integration-domain' )
    );
    return $schedules;
}


// Global for backwards compatibility.
$GLOBALS['FileMaker'] = FileMakerInit();