php创建一个对象??

$a = new stdClass();
echo "<pre>";
var_dump(json_encode($a));
echo "</pre>";

exit;

$a = new stdClass();
$a->id = 'id';
$a->name = 'name';
$b = [
'id' => 'id',
'name' => 'name',
];
echo "<pre>";
var_dump(json_encode($a));
var_dump(json_encode($b));
echo "</pre>";
exit;

共前端分辩json的对象和数组