PHP传递引用 - 如果要更改数组中的值，它在foreach中会更快吗？

Is passing by reference faster in foreach when you want to change the value in the array?

For instance,

$a = array (
    0 => array(
        'title' => 'x',
        'content' => 'x',
        'time' => 'x'
    ),
    1 => array(
        'title' => 'x',
        'content' => 'x',
        'time' => 'x'
    ),
    2 => array(
        'title' => 'x',
        'content' => 'x',
        'time' => 'x'
    )
);

function stripData(array $a)
{
    return array(
        'title' => $a['title'],
        'content' => $a['content']
    );
}

without reference

$b = array();
$begin = microtime(true);
foreach ($a as $v) {
    $b[] = stripData($v);
}
$end = microtime(true);
echo $end - $begin . "
"; // 1.38282775879E-5

with reference

$begin = microtime(true);
foreach ($a as &$v) {
    $v = stripData($v);
}
$end = microtime(true);
echo $end - $begin . "
"; // 4.05311584473E-6

I tested it on http://phpfiddle.org/ but the #1 seems to be faster while #2 (reference) is a lot slower.

Any ideas?

What would you do in the case like this? Would you do the #1 or #2? Using the reference is less code obviously!