Wordpress_Cron_Job_Demo.php

<?php
/**
 * Plugin Name: p47 Cron Job
 * Plugin URI: http://point47.com
 * Description: demo for a running cron job
 * Version: 1.0
 * Author: Sorin Gitlan
 * Author URI: http://point47.com
 */

add_action( 'init', function(){

    // first remove any scheduled event
    $time = wp_next_scheduled( 'p47_cron_hook' );
    wp_unschedule_event( $time, 'p47_cron_hook' );

    // create the cron job event
    if( !wp_next_scheduled( 'p47_cron_hook' )){
        wp_schedule_event( time(), 'two-minutes', 'p47_cron_hook' );
        
        // Creates a single cron event that will execute one hour from now.
        //wp_schedule_single_event( time() + 3600, 'p47_cron_hook');
    }

});


// Create a Options menu entry in the Admin menu
add_action( 'admin_menu', function(){

    add_options_page( 'Cron settings', 'Cron Settings', 'manage_options', 'p47-cron', function(){

        $cron = _get_cron_array();
        $schedules = wp_get_schedules();

        ?>
            <div class="wrap">
                <h2>Cron Event Scheduled</h2>
                <?php
                foreach ($schedules as $name) {
                    echo '<h3>'. $name['display'] .' : ' . $name['interval'] .  '</h3>';
                }
                ?>
            </div>
        <?php
    } );

} );

add_action('p47_cron_hook', function(){
    $str = time();
    wp_mail( 'forapathy@gmail.com', 'Scheduled WP cron', 'This email was sent at: '.$str );
});

// add new interval values that can be used in wp_schedule_event()
add_filter('cron_schedules', function($schedules){
    $schedules['two-minutes'] = array(
        'interval' => 120,
        'display' => 'Every two minutes'
    );

    $schedules['ten-minutes'] = array(
        'interval' => 600,
        'display' => 'Every ten minutes'
    );

    return $schedules;
});