The PHP client allows you to easily send errors via HTTP. The PHP client can be used independently, or as part of a greater implementation. Quick example.
<?php
include("arecibo.php");
$fields = array(
"account" => "yourpublicaccountnumber",
"status" => "403",
"url" => "http://badphpapp.org"
);
post("http://yoursevers/v/1/", $fields);
?>