如何在php中上传jpeg图像

谁能告诉我，如何解决以下问题

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: gd-jpeg: JPEG library reports unrecoverable error: in /var/www/html/_controls/_images.php on line 28

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: '/var/tmp/phpaFbMJV' is not a valid JPEG file in /var/www/html/_controls/_images.php on line 28

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /var/www/html/_controls/_images.php on line 52

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: gd-jpeg: JPEG library reports unrecoverable error: in /var/www/html/_controls/_images.php on line 28

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: '/var/tmp/phpaFbMJV' is not a valid JPEG file in /var/www/html/_controls/_images.php on line 28

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /var/www/html/_controls/_images.php on line 52

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: gd-jpeg: JPEG library reports unrecoverable error: in /var/www/html/_controls/_images.php on line 28

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: '/var/tmp/phpUakeQQ' is not a valid JPEG file in /var/www/html/_controls/_images.php on line 28

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /var/www/html/_controls/_images.php on line 52

Warning: Cannot modify header information - headers already sent by (output started at /var/www/html/_controls/_images.php:28) in /var/www/html/_templates/code/admin/edit_project_image.php on line 40

我的源代码：

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phpaFbMJV显然不是JPEG文件？

您提供的文件不是有效文件，请检查该文件。只有扩展名.jpg不一定是有效的jpg格式图像。

一旦试图发现漏洞的用户很容易覆盖内容类型头，我建议您使用打开文件

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接下来，您希望在保存图像时保留图像格式。我建议您只使用一种格式，例如png，这样您的所有图像现在都是相同的类型，您就不必再担心这些了。

如果您显示代码检查是否安装了GD库，我们可以为您提供帮助，因为错误会有所不同，类似于警告：某些功能已被禁用..意味着我没有得到你，请你清楚地告诉我。但我上载了有效的jpeg图像文件。@ramkumar尝试使用move_uploaded_文件简单地移动图像，然后下载，以查看服务器接收到的内容。您的问题中缺少一些代码。$raw\u file\u post数组的内容是什么？

    <?
class image_control
{
     public $raw_image = "";
     public $temp_loc = "";

     public $image = "";
     public $image_resized = "";

     public $name = "";
     public $type = "";
     public $width = "";
     public $height = "";

     public $resize_to_width = "";
     public $resize_to_height = "";

     public $errors = array();

     function __construct($raw_file_post){
          $this->raw_image = $raw_file_post;

          $this->temp_loc = $raw_file_post['tmp_name'];
          $this->name = $raw_file_post['name'];

          if($raw_file_post['type'] == "image/jpeg" || $raw_file_post['type'] == "image/pjpeg"){
               $this->type = 'jpeg';
               $this->image = imagecreatefromjpeg($this->temp_loc);
          }
          elseif($raw_file_post['type'] == "image/png" || $raw_file_post['type'] == "image/x-png"){
               $this->type = 'png';
               $this->image = imagecreatefrompng($this->temp_loc);
          }
          elseif($raw_file_post['type'] == "image/gif"){
               $this->type = 'gif';
               $this->image = imagecreatefromgif($this->temp_loc);
          }
          else
               $error[] = 001;

          list($this->width, $this->height) = getimagesize($this->temp_loc);

          $this->image_resized = imagecreatetruecolor($this->width, $this->height);

          imageantialias($this->image_resized, true);

          imagealphablending($this->image_resized, false);
          imagesavealpha($this->image_resized,true);
          $transparent = imagecolorallocatealpha($this->image_resized, 255, 255, 255, 127);
          imagefilledrectangle($this->image_resized, 0, 0, $this->width, $this->height, $transparent);

          imagecopyresampled($this->image_resized, $this->image, 0, 0, 0, 0, $this->width, $this->height, $this->width, $this->height);
          $this->image = $this->image_resized;
          $this->image_resized = "";
     }

     function resize($width, $height, $resample = false){
          if($width !== '' && $width !== NULL && $width !== 'auto')
               $this->resize_to_width = $width;

          if($height !== '' && $height !== NULL && $height !== 'auto')
               $this->resize_to_height = $height;

          if($width == 'auto' || $height == 'auto'){
               if($height == 'auto')
                    $this->resize_to_height = ($this->resize_to_width / $this->width) * $this->height;

               if($width == 'auto')
                    $this->resize_to_width = ($this->resize_to_height / $this->height) * $this->width;
          }

          $this->image_resized = imagecreatetruecolor($this->resize_to_width, $this->resize_to_height);

          imageantialias($this->image_resized, true);

          imagealphablending($this->image_resized, false);
          imagesavealpha($this->image_resized,true);
          $transparent = imagecolorallocatealpha($this->image_resized, 255, 255, 255, 127);
          imagefilledrectangle($this->image_resized, 0, 0, $this->resize_to_width, $this->resize_to_height, $transparent);

          imagecopyresampled($this->image_resized, $this->image, 0, 0, 0, 0, $this->resize_to_width, $this->resize_to_height, $this->width, $this->height);

          if($resample == true){
              $this->image = $this->image_resized;
              $this->width = $this->resize_to_width;
              $this->height = $this->resize_to_height;

              $this->image_resized = "";
              $this->resize_to_width = "";
              $this->resize_to_height = "";
          }
     }

     function save($folder_dir, $name){
          if(is_dir($folder_dir)){
               if($this->type == 'jpeg')
                    imagejpeg($this->image, $folder_dir . '/' . $name . '.jpg', 100)
                         or die('Image error');
               elseif($this->type == 'png')
                    imagepng($this->image, $folder_dir . '/' . $name . '.png')
                         or die('Image error');
               elseif($this->type == 'gif')
                    imagegif($this->image, $folder_dir . '/' . $name . '.gif')
                         or die('Image error');
          }
          else
               return false;

          return true;
     }
}
?>

/var/tmp/phpaFbMJV' is not a valid JPEG file

$this->image = @imagecreatefromstring(@file_get_contents($this->temp_loc));
if ($this->image === false) {
  throw new Exception("File is unreachable or not a supported image");
}