How to create users with custom field in Appcelerator API using PHP CURL?

If you want to creates a new user with custom field then it's not a big deal. Follows the instructions and use the code below.

Instructions: When creating a user, you must specify either:
    * username
    * email address, first name, and last name

A user can have both an email address and username specified. However, if username is blank then email address, first name and last name are required.

We are creating here a user just by using the username, we are not using email here. So we just need username, password and password_confirmation.

Role: Whatever you want to add. I am taking as 'teacher'. It is not mendatory.
Custom Field: 'pranay' having value equal to '23'. It can be anything. Ex: Age, Gender.

PHP CURL Code: 

$key = 'YourAppceleratorKey';
$Curl_Session = curl_init("https://api.cloud.appcelerator.com/v1/users/create.json?key=" . $key.'&pretty_json=true&role=teacher&custom_fields={"pranay":23}');
 
curl_setopt($Curl_Session, CURLOPT_RETURNTRANSFER, true);    
$post_array = array('username' => "pgtest3", 'password' => "pgtest3" , 'password_confirmation' => "pgtest3");
curl_setopt($Curl_Session, CURLOPT_POSTFIELDS, $post_array);
$resp = curl_exec($Curl_Session);
curl_close($Curl_Session);

Reference Document: http://docs.appcelerator.com/cloud/latest/#!/api/Users-method-create