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我正在开发一个网站,用户可以将多个图像上传到服务器/网站,在我的上传脚本中,我将图像大小限制为 10MB。这是因为我认为很多现代相机都会拍摄大图像。

上传脚本一次拍摄一张图片,并将其大小调整为 3 个不同的版本,900x600、600x450 和一个较小的缩略图,并在 2 个较大的图像的顶部放置一个水印图像。

我将 php.ini memory_limit 设置为 96MB,我认为这很容易。

经过一番测试,我上传了一张 6.38MB 大小的 jpg 图像,分辨率为 6143 x 3855 像素。我收到错误消息“致命错误:允许的内存大小为 100663296 字节已用尽(尝试分配 24572 字节)”

您认为需要这么多内存来上传和处理这种大小的图像是否合理?还是您认为这更有可能是我脚本中的编码问题?

96 MB 内存限制对我来说似乎很多。其他人处理大图像上传的经验是什么?我应该将内存限制设置为 128MB 或更高吗?或者我应该看看重写我的上传脚本?

我的代码添加如下:

      //If a new image has been added, resize and upload to filesystem
      if ($_FILES['new_image']['name'] !=''){

          $allowed_types=array(
            'image/gif' => '.gif',
            'image/jpeg' => '.jpg',
            'image/png' => '.png',
            'image/x-png' => '.png',
            'image/pjpeg' => '.jpg'
          );

          $img = $_FILES['new_image'];

          // Check the file to be uploaded is the correct file type and is under 9MB              

          if ((array_key_exists($img['type'], $allowed_types)) && ($img['size'] < 9000000))              {
          // File to be uploaded is Valid


          // File to be uploaded is Valid

          $imagename = stripslashes($_FILES['new_image']['name']);

          // make the random file name
          $randName = md5(rand() * time());
          $ext = pathinfo($imagename, PATHINFO_EXTENSION); 


          $imagename = $randName . "." . $ext;
          $source = $_FILES['new_image']['tmp_name'];


          // Check if Directory Exists, if not create it
          if(!file_exists("images/breeds/".$trimmed['profile_id']))
          { 
               mkdir("images/breeds/".$trimmed['profile_id']) or die("Could not create images folder for article ".$trimmed['profile_id']);
          } 

          // Check if thumbnail Directory Exists
          if(!file_exists("images/breeds/".$trimmed['profile_id']."/thumbs")) 
          { 
              mkdir("images/breeds/".$trimmed['profile_id']."/thumbs") or die("Could not create thumbnail folder for article ".$trimmed['profile_id']);
          } 

          // Check if thumbnail Directory Exists
          if(!file_exists("images/breeds/".$trimmed['profile_id']."/large")) 
          { 
              mkdir("images/breeds/".$trimmed['profile_id']."/large") or die("Could not create thumbnail folder for article ".$trimmed['profile_id']);
          } 


          $LargeImage = "images/breeds/".$trimmed['profile_id']."/large/".$imagename;
          $NormalImage = "images/breeds/".$trimmed['profile_id']."/".$imagename;
          $SmallImage = "images/breeds/".$trimmed['profile_id']."/thumbs/".$imagename;

          //uploaded temp file
          $file = $_FILES['new_image']['tmp_name'];


          //Get Image size info
          list($width, $height, $image_type) = getimagesize($file);

          //SourceImage
          switch ($image_type) 
          {
            case 1: $image = imagecreatefromgif($file); break;
            case 2: $image = imagecreatefromjpeg($file);  break;
            case 3: $image = imagecreatefrompng($file); break;
            default:  trigger_error('Unsupported filetype!', E_USER_WARNING);  break;
          }


          // Constraints for Large Image 
          $max_width = 900; 
          $max_height = 600; 
          $ratioh = $max_height/$height; 
          $ratiow = $max_width/$width; 
          $ratio = min($ratioh, $ratiow); 

          if (($height < $max_height) && ($width < $max_width)) {
           //keep same dimensions
           $modwidth = $width;
           $modheight = $height;
          } else {
          // New dimensions 
          $modwidth = intval($ratio*$width); 
          $modheight = intval($ratio*$height);
          }

          $tmpLarge = imagecreatetruecolor( $modwidth, $modheight );

          imagecopyresampled($tmpLarge, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ; 

          // Add Watermark to large image at top right

          $wm = "images/p4h-wm-200.png";
          $wmImage = imagecreatefrompng($wm); 
          $wmW = imagesx($wmImage); 
          $wmH = imagesy($wmImage); 

          $photoW = imagesx($tmpLarge); 
          $photoH = imagesy($tmpLarge);
          $dest_x = $photoW - $wmW - 10; 
          $dest_y = 10;

          // imagecopymerge($tn, $wmImage, $dest_x, $dest_y, 0, 0, $wmW, $wmH, 100); 
          imagecopy($tmpLarge, $wmImage, $dest_x, $dest_y, 0, 0, $wmW, $wmH);


          switch ($image_type) 
          {
             case 1: imagegif($tmpLarge,$LargeImage); break;
             case 2: imagejpeg($tmpLarge,$LargeImage, 80);  break;
             case 3: imagepng($tmpLarge,$LargeImage, 0); break;
             default:  trigger_error('Failed resize image!', E_USER_WARNING);  break;
          }


          // Destroy tmp images to free memory
          imagedestroy($tmpLarge);
          imagedestroy($wmImage);


          // Constraints for Normal Image 
          $max_width = 550; 
          $max_height = 413; 
          $ratioh = $max_height/$height; 
          $ratiow = $max_width/$width; 
          $ratio = min($ratioh, $ratiow); 

          if (($height < $max_height) && ($width < $max_width)) {
           //keep same dimensions
           $modwidth = $width;
           $modheight = $height;
          } else {
          // New dimensions 
          $modwidth = intval($ratio*$width); 
          $modheight = intval($ratio*$height);
          }

          $tmpNormal = imagecreatetruecolor( $modwidth, $modheight );

          imagecopyresampled($tmpNormal, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ; 

          // Add Watermark to large image at top right

          $wm = "images/p4h-wm-150.png";
          $wmImage = imagecreatefrompng($wm); 
          $wmW = imagesx($wmImage); 
          $wmH = imagesy($wmImage); 

          $photoW = imagesx($tmpNormal); 
          $photoH = imagesy($tmpNormal);
          $dest_x = $photoW - $wmW - 10; 
          $dest_y = 10;

          // imagecopymerge($tn, $wmImage, $dest_x, $dest_y, 0, 0, $wmW, $wmH, 100); 
          imagecopy($tmpNormal, $wmImage, $dest_x, $dest_y, 0, 0, $wmW, $wmH);

          switch ($image_type) 
          {
             case 1: imagegif($tmpNormal,$NormalImage); break;
             case 2: imagejpeg($tmpNormal,$NormalImage, 90);  break;
             case 3: imagepng($tmpNormal,$NormalImage, 0); break;
             default:  trigger_error('Failed resize image!', E_USER_WARNING);  break;
          }

          // Destroy tmp images to free memory
          imagedestroy($tmpNormal);
          imagedestroy($wmImage);


          // Now that the full size image has been saved, resize the thumbnail one to a fixed size for homepage display
          // Constraints 
          $thumb_width = 150; 
          $thumb_height = 112.5; 

         // Calculate stuff and resize image accordingly     
         $src_ratio = $width/$height;
         $dst_ratio = $thumb_width/$thumb_height;
         if($src_ratio < $dst_ratio) // trim top and bottom
         {
            $ratio = $width/$thumb_width;
            $crop_height = $thumb_height*$ratio;
            $src_y = round(($height-$crop_height)/2);
            $crop_width = $width;
            $src_x = 0;
         }
         else // trim left and right
         {
            $ratio = $height/$thumb_height;
            $crop_width = $thumb_width*$ratio;
            $src_x = round(($width-$crop_width)/2);
            $crop_height = $height;
            $src_y = 0;
         }


          $tmpSmall = imagecreatetruecolor( $thumb_width, $thumb_height );

          imagecopyresampled($tmpSmall, $image, 0, 0, $src_x, $src_y, $thumb_width, $thumb_height, $crop_width, $crop_height);

          switch ($image_type) 
          {
             case 1: imagegif($tmpSmall,$SmallImage); break;
             case 2: imagejpeg($tmpSmall,$SmallImage, 90);  break;
             case 3: imagepng($tmpSmall,$SmallImage, 0); break;
             default:  trigger_error('Failed resize image!', E_USER_WARNING);  break;
          }

        // Destroy images to free memory
        imagedestroy($image);
        imagedestroy($tmpSmall);
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3 回答 3

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jpg 是 6.38MB ,但要转换图像,使用的内部表示是原始未压缩的表示。

你的图像是 23.6 兆像素

它的未压缩表示可能是每像素 32 位(4 字节),即:4*23.6MBytes = 94 MBytes。

所以,我想说,你需要处理这么大的图像吗?

如果是,则将 memory_limit 设置得更高。

于 2012-03-01T16:01:07.340 回答
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您可能需要向 PHP 提供更多关于何时可以释放内存的提​​示。一个简单$some_variable = null;的通常就足够了。

完成图像(主图像及其每个缩略图)后,将引用变量设置为null以帮助释放内存。

否则,请尝试在脚本顶部和整个脚本的各个位置打印或记录memory_get_usage()( http://www.php.net/manual/en/function.memory-get-usage.php ) 的结果以进行跟踪在内存陷入困境的地方。

于 2012-03-01T16:01:49.807 回答
0

一个 6143x3855 的图像将需要至少71,043,795 字节的内存来存储原始像素数据(每个像素 3 个字节)。然后您创建一系列其他图像来保存原始图像的调整大小版本,等等......

难怪你的内存用完了。

于 2012-03-01T16:18:26.640 回答