Description:
------------
When set_error_handler() has been used to set a custom error handler, the RuntimeException thrown by DirectoryIterator::__construct() is not handled properly -- the user error handler runs and then code continues after the constructor instead of the exception being thrown.

This is specific to DirectoryIterator, if you replace "$iter = new DirectoryIterator($dir)" with just "throw new Exception('monkey');" in the reproduce code below, the catch block executes OK.


Reproduce code:
---------------
<?php

error_reporting(E_ALL | E_STRICT);
ini_set('display_errors',true);
$dir = '/this/path/does/not/exist';

set_error_handler('my_error_handler');
function my_error_handler() { print "in error handler\n"; }


try {
    print "before\n";
    $iter = new DirectoryIterator($dir);
    print get_class($iter) . "\n";
    print "after\n";
} catch (Exception $e) {
    print "in catch\n";
}

Expected result:
----------------
before
in catch


Actual result:
--------------
before
in error handler
DirectoryIterator
after