Shortcode is not working

Question

I have created a simple shortcode from looking at tutorials:

<?php
/*
Plugin Name: GT NoTranslate Shortcode
Description: Shortcode to wrap a span with the "notranslate" span around text.
Version: 0.1 BETA
Author: Andrew Truckle
Author URI: http://www.trucklesoft.co.uk
*/

function trucklesoft_gtspan_shortcode()
{
    return '<span class="notranslate">' . $content . '</span>';
}

add_shortcode( 'ts', 'trucklesoft_gtspan_shortcode' );
?>

I have placed the code in trucklesoft.php and put it in a folder called trucklesoft in the plugins folder.

I activated the plugin. Yet, when I edit my page and I change the title to:

[ts]This is the heading[/ts]

And preview it it shows as:

[ts]This is the heading[/ts]

Instead of <span class="notranslate">This is the heading</span>.

What am I doing wrong?

---

I had to make changes to the code in the first instance anyway for it to work in the content of the page:

<?php
/*
Plugin Name: GT NoTranslate Shortcode
Description: Shortcode to wrap a span with the "notranslate" span around text.
Version: 0.1 BETA
Author: Andrew Truckle
Author URI: http://www.trucklesoft.co.uk
*/

function trucklesoft_gtspan_shortcode($atts, $content = null)
{
    return '<span class="notranslate">' . $content . '</span>';
}

add_shortcode( 'ts', 'trucklesoft_gtspan_shortcode' );
?>

The location where I was initially trying to use this plugin was the title. When I view the source it shows it in this location:

<header class="entry-header">
    <h1 class="entry-title">Test</h1>
</header><!-- .entry-header -->

Answer 1

It looks like you are trying to apply a shortcode to the title field. That is not supported by itself (only shortcodes in the post content are evaluated automatically), but easily remedied by adding it as a filter to get_the_tile in your plugin:

add_filter ('the_title', 'do_shortcode');

(I'm assuming that you ruled out other possible problems by running your shortcode in the content field and establishing that it works properly there)

EDITED The filter is in the function get_the_title, but its name is the_title.