Array in element of object [closed]

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Why in example 'mytest' isn't an 开发者_运维技巧array?

class myclass { 
 public $mytest = array();
}
$insert = new myclass;
$insert -> mytest = Array (15, 50);

---

It is an array:

class myclass { 
 public $mytest = array();
}
$insert = new myclass;
$insert -> mytest = Array (15, 50);
echo gettype($insert->mytest); // prints array