Ajax上传文件：$ _FILES为空，但文件存在于请求标头中 [英] Ajax Upload File: $_FILES is empty but files exists in request header

问题描述

当用户在页面上删除文件时，我使用formdata上传文件。在客户端一切正常，文件详细信息存在于Request标头中，但是当我打印__（$ _ FILES）时，它返回一个空数组。没有设置服务器端限制。我通过手动上传文件来测试它。

I am using formdata to upload file when user drops files on page. everything works fine in client side and file details exist in Request header but when i print_r($_FILES), it returns an empty array. No Server side limit is set. i did test it by uploading a file manually.

请求详细信息： https://www.dropbox.com/s/tfta4ulqlxsaism/csz.PNG

js代码：

$('html').live('drop', function(e)
    {
       try
        {
            e.stopPropagation();
            e.preventDefault();
            var files = e.originalEvent.dataTransfer.files || e.target.file || e.dataTransfer.files;
            var file;
            var len = files.length;
            var i =0;
            var formdata = new FormData();
            for ( ; i < len; i++ ) {
                file = files[i];
                if ( window.FileReader ) {
                    reader = new FileReader();
                    reader.onloadend = function (e) { 
                        $('html').removeClass('hover');
                    };
                    reader.readAsDataURL(file);
                }

                if (formdata) {
                    formdata.append("files[]", file);
                }       
            }
            if (formdata) 
            {
                $.ajax({
                    url: base_url+"/kh/site/file/upld",
                    type: "POST",
                    data: formdata,
                    processData: false,
                    contentType: false,
                    success : function(res){
                        console.log(res);
                    },
                    error: function(res){
                        console.log(res);
                    }
                });
            }
            return false;
        }catch(a){console.log(a.message);}     
    });

PHP代码：

<?php print_r($_FILES); ?>

我缺少什么？

谢谢提前！

推荐答案

我遇到了完全相同的问题，结果证明这不是AJAX错误。说到PHP，上传不仅限于 upload_max_filesize 。在服务器上配置上传参数时，请考虑以下内容：

I had the exact same issue, and it turns out it is not an AJAX fault. When it comes to PHP, upload is limited NOT only by upload_max_filesize. Take into consideration the following ini's when configuring upload params on your server:

max_execution_time ：如果你设置 upload_max_filesize 到100mb，脚本的max_execution_time为5秒，服务器最有可能返回404或500.

max_execution_time: if u set upload_max_filesize to 100mb and the script has a max_execution_time of 5 sec., the server will most likely return 404 or 500.

max_input_time ：您希望此值足够高，以便完成完整上传，具体取决于 upload_max_filesize 。如今的互联网连接有很大的下载带宽，但上传是有问题的。

max_input_time: u want this to be high enough in order for a full upload to complete, depending on upload_max_filesize. Internet connections nowadays have a large download bandwidth, but the upload is questionable.

post_max_size ：上传过程是由定义，一个$ _POST请求，所以如果 upload_max_filesize 的值为100mb，你就不能有 post_max_size 的值那个更低。嗯，实际上你可以，但上传时，如果总上传大小介于 post_max_size 和 upload_max_filesize 之间，$ _FILES将会仍然是空的。

post_max_size: an upload process is by definition, a $_POST request, so if upload_max_filesize has a value of 100mb, u can't have a post_max_size value that is lower. Well, actually u can, but when uploading, if the total upload size falls between post_max_size and upload_max_filesize, $_FILES will still be empty.

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