UnityWebRequest POST to PHP not work

I use documentation with WWWForm: Unity - Manual: Sending a form to an HTTP server (POST)

C#:

void Start() {
    StartCoroutine(Upload());
}

IEnumerator Upload(){
	yield return Upload1();
	yield return Upload2();
}

IEnumerator Upload1() {
    List<IMultipartFormSection> formData = new List<IMultipartFormSection>();
    formData.Add( new MultipartFormDataSection("field1=foo&field2=bar") );
    //formData.Add( new MultipartFormFileSection("my file data", "myfile.txt") );

    UnityWebRequest www = UnityWebRequest.Post(url, formData);
    yield return www.SendWebRequest();

    if(www.isNetworkError || www.isHttpError) {
        Debug.Log(www.error);
    }
    else {
        Debug.Log("Form upload complete!");
		Debug.Log( "MULTIPART: " + www.downloadHandler.text );
    }
}

IEnumerator Upload2() {
    WWWForm form = new WWWForm();
    form.AddField("myField", "myData");

    UnityWebRequest www = UnityWebRequest.Post(url, form);
    yield return www.SendWebRequest();

    if(www.isNetworkError || www.isHttpError) {
        Debug.Log(www.error);
    }
    else {
        Debug.Log("Form upload complete!");
		Debug.Log( "WWWForm: " + www.downloadHandler.text );
    }
}

PHP:

<?php 

	echo "POST: ";
	print_r( $_POST );
	var_dump( $_POST );
	
	echo "GET: ";
	print_r( $_GET );
	var_dump( $_GET );
	
?>

Response (MULTIPART and WWWForm):

POST: Array
(
)
array(0) {
}
GET: Array
(
)
array(0) {
}

#$_POST is empty… (that’s my problem)
Use Unity 2017.3.

I used UnityWebRequest.Send (Unity 5.6) before and it worked for me until it became obsolete.

Thanks.

Solved: unity game engine - UnityWebRequest POST to PHP not work - Stack Overflow