index.php

<?php
// List down all the functions assigned to the "the_content" filter hook.
function get_the_content_filters() {
	$filters = array();
	ob_start();
	the_content();
	$output = ob_get_clean();

	global $wp_filter;

	if ( isset( $wp_filter['the_content'] ) ) {
		foreach ( $wp_filter['the_content'] as $priority => $callbacks ) {
			foreach ( $callbacks as $callback ) {
				$filters[] = $callback['function'];
			}
		}
	}

	return $filters;
}