Sometimes the profiler gets line numbers wrong and shows costs at the wrong place:

derick@kossu:/tmp$ cat test.php
<?php
xdebug_start_trace();
require_once('t1.inc');

$a = array("testing");

t1();
derick@kossu:/tmp$ cat t1.inc
<?php

require_once('t2.inc');

function tt() {
echo "bla";
echo "bah";

}

function t1() {
global $a;
if (count($a) && errors_fatal($a))
echo "ok";
return TRUE;
}
derick@kossu:/tmp$ cat t2.inc
<?php

function errors_fatal($a) {
count($a) && is_array($a);
return FALSE;
}