How to submit retrieve a form from URL and submit it using PHP?

I found a task to access my skills. The Task is to get a form from a given URL and fill the form. The form will have 3 input as Name, email, and a count and a square, combination of "x"& "". Fill all the fields, In the input box named count, I have to fill the count of "" and then I have to submit the form. I have to use PHP only.

The form should be submitted to the same URL where I get the form. I have tried using the cURL, but it returns the form again and not the expected output.

if(!empty($_POST)){    echo "<pre>";    print_r($_POST);    echo "</pre>";    $ch = curl_init();    curl_setopt($ch, CURLOPT_URL, $url);    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);    curl_setopt($ch, CURLOPT_POST, true);    $data = $_POST;    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);    $out = curl_exec($ch);    $inf = curl_getinfo($ch);    curl_close($ch);    echo "<pre>";    print_r($out);    print_r($inf);    echo "</pre>";    exit;  }

After submitting the form I expect to get "Thanks for submitting." text. Instead, I get the same form as output.