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我有一个从数据库返回图像的函数，该图像在数据库中是 100% 正常的，但是当它被发送到浏览器时，一个换行符（返回）被插入到最开始，它会损坏文件。

返回文件的代码是：

//if(ob_get_length() > 0)
            //{
                //ob_clean();
            //}

将上面的内容注释掉，因为当它被取消注释时，它甚至不会让浏览器下载文件。

function header_file($data, $file_data)
            {
                $last_modified = gmdate('D, d M Y H:i:s', $file_data['unix_last_modified_time'])." GMT";

                // update the accessed record
                $GLOBALS['db']->query("update file_uploads set file_upload_accessed_count = file_upload_accessed_count + 1 where file_upload_id = '".$GLOBALS['id']."'");

                // if browser question if it's up to date
                if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']))
                {
                    // parse header
                    $if_modified_since = preg_replace('/;.*$/', '', $_SERVER['HTTP_IF_MODIFIED_SINCE']);

                    if ($if_modified_since == $last_modified)
                    {
                        // the browser's cache is still up to date
                        header("HTTP/1.0 304 Not Modified");
                        header("Cache-Control: max-age=86400, must-revalidate");
                        exit;
                    }
                }

                header("Cache-Control: max-age=86400, must-revalidate");
                header("Last-Modified: ".$last_modified);
                header("Content-Type: ".$file_data['file_upload_type']);

                if($file_data['file_upload_type'] == 'application/x-shockwave-flash')
                    header("Content-Disposition: inline; filename=\"".str_replace(' ','_',$file_data['file_upload_name'])."\"");
                else
                    header("Content-Disposition: attachment; filename=\"".str_replace(' ','_',$file_data['file_upload_name'])."\"");

                // send data to output
                echo $data;
                exit;
            }

相关问题： 从数据库返回的 PHP 头文件损坏的文件？ https://stackoverflow.com/questions/19768650/zend-caching-of-images-gives-problems-once-the-site-goes-down-for-a-while

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1 回答 1

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I would do the following. You have an extra space somewhere in your PHP file.
It can be a bit tricky to find, so start putting some 

echo "here"

in your code to see if this newline is found before or after the echo. Keep moving he echo statement up or down the file until you can see where it is (it might be in an include file, so you will have to track it down.

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于 2013-11-06T07:20:36.267 回答