<?php
/*
Plugin Name: Placeholders for WordPress
Plugin URI: http://www.andrejciho.com/
Description: Insert placeholders in your posts/pages and have functionality be tied to those.
Author: Andrej Ciho
Version: 0.0.1
Author URI: http://www.andrejciho.com/
*/

$andrej_tokens = array();
// $andrej_tokens['##exampleplaceholders##'] = 'example text that appears instead of the placeholder';

function andrej_swap_tokens($text) {
  global $andrej_tokens;
  foreach($andrej_tokens as $token => $replacement) {
    $text = str_replace($token, $replacement, $text);
  }
  return $text;
}

add_filter('the_content', 'andrej_swap_tokens');
?>