$username = "ZX";
$password = "ZX";
$host = 'http://ZX.com/wp-json/wp/v2/media';
$data = json_encode($data);
$file = '/Users/xx.png';
$imagedata  = file_get_contents($file);
$process = curl_init($host);
curl_setopt($process, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($process, CURLOPT_BINARYTRANSFER, TRUE);
curl_setopt($process, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($process, CURLOPT_TIMEOUT, 50);
curl_setopt($process, CURLOPT_USERPWD, $username . ":" . $password);
curl_setopt($process, CURLOPT_POSTFIELDS, $data);
curl_setopt($process, CURLOPT_HTTPHEADER, array('Content-Type:image/png','Content-Disposition:attachment;filename='.$file));
$return = curl_exec($process);
print_r($return);

$data = array(
  "status" => "draft",
  "title" => "Photo media",
  "description" => "Photo media1",
  "media_type" => "image",
  "alt_text" => "alternate text"
  );