使用php上载照片时出现“在进程中调整大小”错误

我在这段代码中有错误：

  copy($newFile,$target_dir.'slider_'.$newName);
  $file2 = $target_dir.'slider_'.$newName; //This is the original file
  list($width2, $height2) = $newFile;

  $modwidth2 = 750;
  $modheight2 = 300;
  $tn2 = imagecreatetruecolor($modwidth2, $modheight2);

  if ($imageFileType == "jpg"){

    $image2 = imagecreatefromjpeg($newFile);
    imagecopyresampled($tn2, $image2, 0, 0, 0, 0, $modwidth2, $modheight2, $width2, $height2);
    imagejpeg($tn2, $file2, 50);

  } elseif  ($imageFileType == "png"){

    imagealphablending($tn2, false);
    imagesavealpha($tn2, true);
    $image2 = imagecreatefrompng($newFile);
    imagecopyresampled($tn2, $image2, 0, 0, 0, 0, $modwidth2, $modheight2, $width2, $height2);
    imagepng($tn2, $file2, 9);

  } elseif  ($imageFileType == "jpeg"){

    $image2 = imagecreatefromjpeg($newFile);
    imagecopyresampled($tn2, $image2, 0, 0, 0, 0, $modwidth2, $modheight2, $width2, $height2);
    imagejpeg($tn2, $file2, 9);

  }

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如果我上传照片，输出总是空白的黑色。你能告诉我这段代码有什么问题吗？

你没有正确获得宽度和高度

list($width2, $height2) = $newFile;

改为

list($width2, $height2) = getimagesize ($newFile) 

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您没有正确获取宽度和高度

list($width2, $height2) = $newFile;

改为

list($width2, $height2) = getimagesize ($newFile) 

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列表（$width2，$height2）=$newFile；这是什么意思？它可能是list（$width2，$height2）=getimagesize（$newFile）从$newFile获取列表宽度和高度，将其PhotoList（$width2，$height2）=$newFile归档；这是什么意思？它可能是列表（$width2，$height2）=getimagesize（$newFile）从$newFile获取列表宽度和高度，并将其照片归档