PHP中构造函数的类较慢

Question

I have created two classes:

class TestClass
{
    public $id;
    public $name;
    public $time;
}

class TestClassCtor
{
    public $id;
    public $name;
    public $time;

    public function __construct()
    {
    }
}

Now I run a simple code:

$tt = microtime(true);
$data = array();
for ($i = 0; $i < 10000; $i++)
{
    $t = new TestClass();
    $t->id = rand();
    $t->name = rand();
    $t->time = rand();

    $data[] = $t;
}
echo microtime(true) - $tt;
echo "
";    

$tt = microtime(true);
$data1 = array();
for ($i = 0; $i < 10000; $i++)
{
    $t = new TestClassCtor();
    $t->id = rand();
    $t->name = rand();
    $t->time = rand();

    $data1[] = $t;
}
echo microtime(true) - $tt;

Now, the second code with TestClassCtor is around 30% slower. Why? (tested with PHP 5.6 and 7.1).

Edit:

The similar difference can be spotted with (in this case, I can understand it - passing arguments to method may be slower).

class TestClassCtorFill
{
    public $id;
    public $name;
    public $time;

    public function __construct($id, $name, $time)
    {
        $this->id = $id;
        $this->name = $name;
        $this->time = $time;
    }
}

In this case, I can create class in one line as

for ($i = 0; $i < 10000; $i++)
{
    $data1[] =  new TestClassCtorFill(rand(), rand(), rand());
}

Yes, this is safer, because user must set all three parameters and he wont forget to set something.

However, when I use this inside my internal framework class, I can omit the ctor entirely and set members directly as with TestClass to save some time. For a few instances, this wont be a much of a difference. But if I create tousands of them, it could be.

Edit 2

I know about cost of a function call. However, constructor is called upon new, so if I write or not one, some constructor should be called. If there is no constructor provided by user a default one is caled. Memory for object must be allocated either way.