Description:
------------
segfault in example codes:

Test script:
---------------
<?php

function handleError($errno, $errstr, $errfile, $errline) {
    $exception = new exception("blah");
    throw $exception;
}
set_error_handler('handleError', E_ALL);
$c = $b[$a];

Expected result:
----------------
no segfault

Actual result:
--------------
segfault