PHP get_class_vars 和 (array)

<?php

class Girl
{
    public $id = 1;
    public $name = 'zhy';
}

$start = microtime(TRUE);
var_dump(get_class_vars(get_class(new Girl())));
$end = microtime(TRUE);
echo "
" . ($end - $start) . "
";

$start = microtime(TRUE);
var_dump((array)(new Girl()));
$end = microtime(TRUE);
echo "
" . ($end - $start) . "
";

一次测试，只看一次的测试：