Картинки без разрешения

$img = imagecreatefromstring(file_get_contents( $_POST['img_get_from_url'] ));

$is_avatar = imagecreatefromstring(file_get_contents( $_POST['img_get_from_url'] ));
if ($is_avatar)
{
  $width_foto  = imagesx($is_avatar);
  $height_foto = imagesy($is_avatar);
  $width_new_ava  = $width_avatar;
  $height_new_ava = $height_avatar;
  $new_avatar = imagecreatetruecolor ( $width_new_ava , $height_new_ava );
  imagecopyresized($new_avatar, $is_avatar, 0, 0, 0, 0, $width_new_ava, $height_new_ava, $width_foto, $height_foto);
  $write_img = imagepng($new_avatar, $sf_avatar);  
}

<?
function IsImage($url, &$ImageFormGD, &$tmpDataImage) {
    $ImageFormGD = false;
    
    $tmpDataImage = trim(file_get_contents($url));
    if(!empty($tmpDataImage))
        $ImageFormGD = @imagecreatefromstring($tmpDataImage);
    
    return $ImageFormGD !== false;
}
 
$url = 'https://avatars.mds.yandex.net/get-kinopoisk-image/1600647/75b5d0bf-b12a-416d-856c-51976179de11/1920x';
 
if(IsImage($url, $ImageFormGD, $tmpDataImage)) {
    
  $width_foto  = imagesx($ImageFormGD);
  $height_foto = imagesy($ImageFormGD);
  $width_new_ava  = 40;
  $height_new_ava = 40;
  $new_avatar = imagecreatetruecolor ( $width_new_ava , $height_new_ava );
  imagecopyresized($new_avatar, $ImageFormGD, 0, 0, 0, 0, $width_new_ava, $height_new_ava, $width_foto, $height_foto);
  $write_img = imagepng($new_avatar, 'file.png');  
    
    
} else {
    file_put_contents('Проблемный файл ['.date("Y-m-d H.i.s").'].txt', $url . PHP_EOL . '--- file data ---' . PHP_EOL . $tmpDataImage);
}

print_r(gd_info());