Insert Software Version in Post or Page

I could not find similar functionality, so I wrote a short plugin that looks for a [version:?] tag in a post or page and insert the detected server software version. The plugin supports the following:

[version:wordpress] — WordPress
[version:mysql] — MySQL
[version:php] — PHP

— [software_versions.php] —

<?php
/*
Plugin Name: Software Versions
Version: 0.1
Plugin URI: http://stephenyeargin.com/blog/tag/plugins/
Description: Versions of server software returned in post or page content if [version:{software}] tag included. Available software: php, mysql, wordpress.
Author: Stephen Yeargin
Author URI: http://stephenyeargin.com
*/

/*
 * Get Software Version
 *
 * Get current versions of your server software
 *
 * @param   string  Software to check
 * @return  string  Version number
 */
function get_software_version($type)
{
    $ver = '???';
    switch($type)
    {
        // MySQL
        case 'mysql':
            global $wpdb;
            $ver = $wpdb->get_var("SELECT VERSION() AS version;");
            break;

        // PHP
        case 'php':
            $ver = phpversion();
            break;

        // WordPress
        case 'wordpress':
            $ver = get_bloginfo('version');
            break;
    }
    return $ver;
}

/*
 * Software Version
 *
 * Filter given text for software version tag, return if requested
 *
 * @param   string  Text of entry
 * @return  string  Filtered text
 */
function software_version($text)
{
    $text = str_replace(
           array('[version:wordpress]', '[version:mysql]', '[version:php]'),
           array(get_software_version('wordpress'), get_software_version('mysql'), get_software_version('php')),
           $text);

    return $text;
}

add_filter('the_content', 'software_version');

Hope someone finds this useful. A bit cleaner than using RunPHP().

– Stephen