After trying to use set_error_handler() with my own handler, I now recieve no error reporting on any script, regardless of using set_error_handler() or not.

Example:
<?php
error_reporting(E_ALL);
define("STUFF", 1);
if (true)
{
define("STUFF", 2);
?>

Would normally generate messages about trying to redefine STUFF, and not closing the IF statement; however, I now recieve no error/warnring/notice messages at all from PHP.

This happened after trying to use set_erro_handler() in a a different script example:

<?php
function my_handler($_errno, $_errstr, $_errfile, $_errline)
{
   printf("%i - %s in %s on line %i",
          $_errno,
          $_errstr,
          $_errfile,
          $_errline);

   return true;
}

set_error_handler("my_handler");

trigger_error("Just something in general", E_USER_ERROR);
?>