WP: List Cronjobs in the footer

index.php

<?php
/*
Plugin Name:    WP Cron Jobs
Plugin URI:     https://github.com/franz-josef-kaiser
Description:    List WordPress internal cron jobs (array data) in the footer. The hook 'wp_footer()' must be present in your theme.
Author:         Franz Josef Kaiser
Author URI:     https://github.com/franz-josef-kaiser
Version:        0.1
License:        GPL v2 - http://www.gnu.org/licenses/old-licenses/gpl-2.0.html

    (c) Copyright 2011 - 2011 by Franz Josef Kaiser

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
*/

// Secure: doesn't allow to load this file directly
if( ! class_exists('WP') )
{
    header( 'Status: 403 Forbidden' );
    header( 'HTTP/1.1 403 Forbidden' );
    exit;
}



/**
 * Builds a table to list current wp internal cron job data
 *
 * @param (mixed) array $cron_arr
 */
function wpse18017_list_cron( $cron_arr )
{
    $cron_arr = ( _get_cron_array() );
    $schedules_arr = wp_get_schedules();

    echo '<br><pre>'; # print_r($schedules_arr); print_r($cron_arr);
    echo '<table>';
    echo '<caption>Dump of the cron/sheduled events:</caption>';
    echo '<tr><th>Function</th><th>Arguments</th><th>Shedule</th><th>Time (h)</th></tr>';
    foreach ( $cron_arr as $fn => $cron_data )
    {
        $output = '<tr>';
        if ( is_array( $cron_data ) )
        {
            foreach ( $cron_data as $fn => $data )
            {
                if ( is_array( $data ) )
                {
                    echo "<td>{$fn}</td>";
                    foreach ( $data as $fn => $d )
                    {
                        $interval = isset( $d['interval'] ) ? ( $d['interval']/60/60 ) : ' - ';
                        foreach ( $schedules_arr as $s )
                            if ( $d['interval'] = $s['interval'] )
                                $schedule = $d['schedule'] ? $d['schedule'] : '<em>not set</em>';
                        echo '<td>';
                            $num_args = count( $d['args'] );
                            $i = 0;
                            foreach ( $d['args'] as $a )
                            {
                                if ( $i < $num_args && $i > 0 )
                                {
                                    echo " {$a}, ";
                                }
                                else
                                {
                                    echo $a;
                                }
                                $i++;
                            }
                        echo '</td>';
                        echo "<td>{$schedule}</td><td>{$interval}</td></tr><tr>";
                    }
                }
                else
                {
                    $interval = isset( $data['interval'] ) ? ( $data['interval']/60/60 ) : ' - ';
                    foreach ( $schedules_arr as $s )
                        if ( $data['interval'] = $s['interval'] )
                            $schedule = $data['schedule'] ? $data['schedule'] : '<em>not set</em>';
                    echo '<td>'.$fn.'</td>';
                    echo '<td>';
                        $num_args = count( $data['args'] );
                        $i = 0;
                        foreach ( $data['args'] as $args )
                        {
                            if ( $i < $num_args && $i > 0 )
                            {
                                echo " {$args}, ";
                            }
                            else
                            {
                                echo $args;
                            }
                            $i++;
                        }
                    echo '</td>';
                    echo "<td>{$schedule}</td><td>{$interval}</td></tr><tr>";
                }
            }
        }
        echo '</tr>';
    }
    echo '</table>';
    echo '</pre>';
}
add_action ( 'wp_footer', 'wpse18017_list_cron' );
?>