Plugin: List wp cron jobs in wp_footer

cron-list.php

<?php
! defined( 'ABSPATH' ) AND exit;
/*
Plugin Name: WP Cron Jobs List
Plugin URI:  https://github.com/franz-josef-kaiser
Description: List WordPress internal cron jobs (array data) after the footer. Based on Kaiser's original plug-in https://gist.github.com/987128
Author:      Franz Josef Kaiser, Stephen Harris
Author URI:  https://github.com/franz-josef-kaiser
Version:     0.3
License:     MIT
*/

/*
* Primary difference between this plug-in and the original, is that this displays each seperate cron-job even when two or more share the same hook (and arguments).
*/

/**
 * Builds a table to list current wp internal cron job data
 */
function wpse18017_list_cron()
{
        //Available cron schedules
	$schedules =  wp_get_schedules();

        //Go through each stored timestamp,
	$results ='';
	foreach ( _get_cron_array() as $timestamp => $jobs)
	{
		if ( is_int( $timestamp ) )
		{
                        //For this timestamp, if it has jobs - loop through them.
			if ( 1 <= count( $jobs ) )
			{
                                //For each hooked job, harvest and print the details.
				foreach ( $jobs as $hook => $details )
				{
					$args = array_values( current( $details ) );
					$interval = $args[0];
					$args = var_export( $args[1], true );
					$schedule = $schedules[$interval]['display'];
					$interval = ( $schedules[$interval]['interval']/60/60 );
					$time = date_i18n( 'jS M G:ia', $timestamp );

					$results .= "<tr><td>{$hook}</td><td>{$args}</td><td>{$schedule}</td><td>{$interval}</td><td>{$time}</td></tr>";
				}
			}
		}
	}
	echo <<< EOF
<div class="clear"></div>
<div class="wrap">
	<table class="wp-list-table widefat" style="margin: 10px;">
		<caption>Dump of the cron/sheduled events:</caption>
		<tr><th>Function</th><th>Arguments</th><th>Shedule</th><th>Time (h)</th><th>Next Schedule For</th></tr>
		$results
	</table>
</div>
EOF;
}
add_action ( 'shutdown', 'wpse18017_list_cron' );