WordPress the_title filter context

wp_the_filter_context.php

<?php
// Answer for https://twitter.com/david_bonilla/status/480982446641778688

// Tested: using in_the_loop() conditional

add_filter('the_title', 'my_the_title');

function my_the_title($title) {

    if (in_the_loop())
    {
        $title .= ' {APPEND_THIS}';
    }

    return $title;
}

// Untested: using debug_backtrace()

// http://webgarb.com/tutorials/wordpress/adding-filter-to-the_title-the_content-hook-without-affecting-other-in-wordpress/