Question

我试图通过使用HTML表单和PHP从用户获取图像文件，一切都很好但是当请求发送到服务器时，客户端获得http 500错误。我想这与一些代码问题有关但我找不到它。 PHP风暴调试器没有显示任何错误

我的html表单：

<form method="POST" action="img.php" enctype="multipart/form-data">
  <textarea style="resize:none" name="data"></textarea>
  <div> <input type="file" name="upfile" id="upfile" /></div>
  <input name="submit" type="submit" value="encrypt" />
  <input name="submit" type="submit" value="decrypt" />
</form>

我的PHP代码：

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $file = $_FILES['upfile']['tmp_name'];
  if (file_exists($file)) {
    $imagesizedata = getimagesize($file);
    if ($imagesizedata === FALSE || !testExtension($_FILES['upfile']['name']) || ($_FILES['upfile']['size'] > 50000)) {
      throw new Exception("The file is not an image Or to big");
    } else {
      $img = imagecreatefromjpeg($file);
      $data = inputValidation($_POST['data']); //example
      $selection = inputValidation($_POST['submit']);
      if ($selection == 'encrypt') { //image
        if ($q = strlen($data) % 3 != 0) {
          $q==1?$data.="--":$data.="-";
        }
        if ($img != false) {
          $j = 0;
          for ($i = 0; $i <= (strlen($data) - 3); $i += 3) {
            $part = substr($data, $i, 3);
            $color = getEncryptedColor($img, $part);
            imagesetpixel($img, $j++, 0, $color);
          }
        }
        //display image//+*+*+*+*+*+*+*
        header('Content-Type: image/jpeg');
        imagejpeg($img);
      } else if ($selection == 'decrypt') {
        //decrypt from image - remove on release
        $dataDec = decryptAllData($img, strlen($data) / 3);
        echo "".$dataDec;
      }
    }
  } else {
    throw new Exception("The upload is not a file or the file doesn't exist anymore.");
  }
  error_reporting(E_ALL);
  ini_set('display_errors', 1);
}

function inputValidation($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}

function decryptAllData($img, $datasize) {
  $decrypted = "";
  for ($i = 0; $i < $datasize; $i++) {
    $decrypted.= decryptDataFromPixel($img, $i, 0);
  }
  return $decrypted;
}

function getEncryptedColor($img, $string) {
  return imagecolorallocate($img, ord($string[0]), ord($string[1]), ord($string[2]));
}

function printImageValues($image, $num) {
  for ($x = 0; $x < $num; $x++) {
    echo "\n".imagecolorat($image, $x, $x);
  }
  echo "--END--";
}

function decryptDataFromPixel($img, $x, $y) {
  $currpixel = imagecolorat($img, $x, $y);
  $colors = imagecolorsforindex($img, $currpixel);
  $str = "".chr($colors["red"]).chr($colors["green"]).chr($colors["blue"]);
  return $str;
}

function testExtension($current_image) {
  $extension = substr(strrchr($current_image, '.'), 1);
  if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "gif") && ($extension != "png") && ($extension != "bmp")) {
    return false;
  }
  return true;
}

Answer 1

请检查三元运算符中的空格

$q == 1 ? $data.= "--" : $data.= "-";

或

$data.= ($q == 1 ? "--" : "-");

PHP http错误500，域无法处理此请求

1 个答案: