In the following code, the trace will be clipped at 1024 mark when xdebug is on, and will behave properly if xdebug is disabled in php.ini (no clipping):

<?php
error_reporting(E_ALL|E_STRICT);
ini_set('display_errors',0);
ini_set('log_errors',1);
ini_set('log_errors_max_len','0');
ini_set('html_errors',0);
ini_set('error_log','c:\log.txt');

function deepTrace($a, $b, $c) {
if ($c < 50) {deepTrace($a, $b, $c+1);} else {throw new
Exception('Example exception that together with the trace is over 1024
bytes.');}
}
deepTrace('example','function',0);
?>