[wp-hackers] Building a JSON API style plugin

[Tom Barrett]

I want to add some trivial JSON requests to a site. I'm wondering if there
is a best practice for this. I have various thoughts on this, but nothing
terribly concrete yet.

1. Is template_redirect the best hook point?
2. If I don't want to use the query string (e.g. /api/ticket/1234.json)
will I get caught up in the rewrite system?

My initial version is this:
add_action( 'template_redirect', 'get_ticket' );
function get_ticket(){
  $ticket = get_ticket_details($_GET['ticket']);
  header('Content-Type: application/json');
  echo json_encode($ticket);
  exit(0);
}

Any glaring WordPress issues there? I appreciate there is no sanity or
taint checking, but it seems that WordPress has a lot of tricks under it's
hood and I'm trying not to rewrite the wheel.

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