Creates JSON class for Tom C. Barret to load tickets via a RESTful API

TCB_JSON_API.php

<?php
/**
 * Creates JSON class for Tom C. Barrett to load tickets via a RESTful API:
 *
 * @example:
 *
 *  URL: http://example.com/api/ticket/12345
 * 
 * @see:
 * 
 *  http://lists.automattic.com/pipermail/wp-hackers/2011-November/041454.html
 *
 */
class TCBarrett_JSON_API {
  static function on_load() {
    add_action( 'template_redirect', array( __CLASS__, 'template_redirect' ), 0 ); // Priority 0: Run this before canonical URL rules
  }
  /**
   * Function to test for a URL that starts with /api/ and then looks to see if
   * it can match the rest of URL with a known API, continues on if no match.
   *
   * @return void
   */
  static function template_redirect() {
    if ( preg_match( '#^/api/(.*)$#', $_SERVER['REQUEST_URI'], $match ) ) {
      $request = explode( '/', $match[1] );
      $output = false;
      switch ( $request[0] ) {
        case 'ticket':
          if ( isset( $request[1] ) && is_numeric( $request[1] ) )
            $output = self::get_ticket_details( $request[1] );
          break;
      }
      if ( $output ) {
        header('Content-Type: application/json');
        echo json_encode( $output );
        exit(0);
      }
    }
  }
  /**
   * Function that actually does the work of loading the ticket into a PHP array
   *
   * @param $ticket_id
   * @return array
   */
  static function get_ticket_details( $ticket_id ) {
    return array(
      'ticket_id' => $ticket_id,
      'content' => 'foo, bar, baz',
     );
  }
}
TCBarrett_JSON_API::on_load();