cURL没有在PHP中发送POST数据

Question

I'm trying to make a small API file and for whatever reason the api.php file I'm sending cURL data to via POST is not receiving the data. I've looked endlessly on here and Google and can't seem to figure out what's wrong. I've tried various different methods and nothings working.

Here's my code.

client.php:

$url = 'http://localhost/listcross2/api.php';

  //var_dump($_POST);
  $rCURL = curl_init();

  $params = array('action' => 'login', 
      'username' => $_POST["username"],
       'password' => $_POST["password"]);

  curl_setopt_array($rCURL, array(
    CURLOPT_RETURNTRANSFER => 1,
    CURLOPT_URL => $url,
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_REFERER => "http://www.localhost/listcross2/client.php",
    CURLOPT_POSTFIELDS => http_build_query($params)
    )
  );

  $aData = curl_exec($rCURL);

  if(curl_errno($rCURL))
  {
      echo 'error:' . curl_error($rCURL);
  }

  curl_close($rCURL);

  $login_result = json_decode ( $aData, true );

  var_dump($login_result);

api.php

$value = "An error has occurred within API: ";
var_dump($_POST);

// For POST actions
if (!empty($_POST))
{
  switch($_POST["action"])
  {
    case "login":
        if (isset($_POST["username"]) && isset($_POST["password"]))
          $value = login($_POST["username"], $_POST["password"]);
        else
          $value = "Missing argument";
        break;
  }
}

exit(json_encode($value));

Answer 1

When I submit to the API page, I get the following error:

Fatal error: Call to undefined function login() in /var/www/playground/api.php on line 13

If you define a function called login(), you will no longer get this error. Also, this code:

exit(json_encode($value));

results in a null value because you are passing it an invalid argument. If you pass json_encode() an array you will no longer get the null value returned from this function. A simple example of the login function:

function login($username, $password) {
    return array("username"=>$username, "password"=>$password);
}