Prints all actions that have fired within a particular request. Useful for debugging.

snippet.php

<?php
// Download this snippet as a plugin and more at: https://wordbits.io/snippet/list-all-wordpress-actions-fired/
// Created by: jeffmatson
?>

<?php
add_action( 'shutdown', function(){
    foreach( $GLOBALS['wp_actions'] as $action => $count )
        printf( '%s (%d) <br/>' . PHP_EOL, $action, $count );
});