Solved why cause err in this code?

i wanna make input form
and here's my code.

PHP:

$pk = new ModalFormRequestPacket();
$form = array();
$form["type"] = "custom_form";
$form["title"] = "title test";
$form["content"] = array("type" => "input","text" => "test","default" => "");
$pk->formId = 23;
$pk->formData = json_encode($form);
$player->dataPacket($pk);


but it doesn't work, cause err:

Code:

Received invalid form json. Error:
/content: Invalid type for property. Expected 'array' got 'object'

how to fix this? thank you for answering

Add, solved

 

array(array("text" => "button1"));
you need to add another array in it.

 

Yes, i noticed
Thank you