MAX_FILE_SIZE 设置的值,不能大于 ini 设置中 upload_max_filesize 选项设置的值。其默认值为 2M 字节。

如果内存限制设置被激活,可能需要将 memory_limit 设置的更大些,请确认 memory_limit 的设置足够的大。

如果 max_execution_time 设置的值太小,脚本运行的时间可能会超过该设置。因此,也请保证 max_execution_time 足够的大。

注意: max_execution_time 仅仅只影响脚本本身运行的时间。任何其它花费在脚本运行之外的时间,诸如用函数 system() 对系统的调用、sleep() 函数的使用、数据库查询、文件上传等,在计算脚本运行的最大时间时都不包括在内。


max_input_time 以秒为单位设定了脚本接收输入的最大时间,包括文件上传。对于较大或多个文件,或者用户的网速较慢时,可能会超过默认的 60 秒

如果 post_max_size 设置的值太小,则较大的文件会无法被上传。因此,请保证 post_max_size 的值足够的大。


请注意 CERN httpd 似乎会丢弃它从客户端获得的 content-type mime 头信息中第一个空格后所有的内容,基于这一点,CERN httpd 不支持文件上传特性。


开发人员不应将普通的输入字段和文件上传的字段混用同一个表单变量(例如都用 foo[])。

add a note add a note

User Contributed Notes 11 notes

amalcon _a_t_ eudoramail _d_o_t_ com
16 years ago
Note that, when you want to upload VERY large files (or you want to set the limiters VERY high for test purposes), all of the upload file size limiters are stored in signed 32-bit ints.  This means that setting a limit higher than about 2.1 GB will result in PHP seeing a large negative number.  I have not found any way around this.
Nirmal Natarajan
11 years ago
If using IIS 7.0 or above, the Request Filtering is enabled by default and the max allowed content length is set to 30 MB.

One must change this value if they want to allow file uploads of more than 30 MB.

Sample web.config entry:

                <requestLimits maxAllowedContentLength="314572800"/>

The above setting will allow 300 MB of data to be sent as a request. Hope this helps someone.
adrien.nizon+phpnet at gmail dot com
4 years ago
[Editor's note: to be more precise, MAX_FILE_SIZE can't exceed PHP_INT_MAX before PHP 7.1.]

Please note that the field MAX_FILE_SIZE cannot exceed 2147483647. Any greater value will lead to an upload error that will be displayed at the end of the upload

This is explained by the related C code :
if (!strcasecmp(param, "MAX_FILE_SIZE")) {
    max_file_size = atol(value);

The string is converted into a long int, which max value is... 2147483647

Seems to be corrected since php-7.1.0beta3 (https://github.com/php/php-src/commit/cb4c195f0b85ca5d91fee1ebe90105b8bb68356c)
admin at creationfarm dot com
18 years ago
The macintosh OS (not sure about OSx) uses a dual forked file system, unlike the rest of the world ;-). Every macintosh file has a data fork and a resource fork. When a dual forked file hits a single forked file system, something has to go, and it is the resource fork. This was recognized as a problem (bad idea to begin with) and apple started recomending that developers avoid sticking vital file info in the resource fork portion of a file, but some files are still very sensitive to this. The main ones to watch out for are macintosh font files and executables, once the resource fork is gone from a mac font or an executable it is useless. To protect the files they should be stuffed or zipped prior to upload to protect the resource fork.

Most mac ftp clients (like fetch) allow files to be uploaded in Macbinhex, which will also protect the resource fork when transfering files via ftp. I have not seen this equivilent in any mac browser (but I haven't done too much digging either).

FYI, apple does have an old utility called ResEdit that lets you manipulate the resource fork portion of a file.
dg at artegic dot de
11 years ago
In case of non-deterministic occurence of the UPLOAD_ERR_PARTIAL error:  The HTTPD (e.g. Apache) should respond with a 'Accept-Ranges: none' header field.
tjaart at siam-data-services dot com
15 years ago
Took me a while to figure this one out...

I think this is actually a header problem, but it only
happens when doing a file upload.

If you attept a header("location:http://...) redirect after
processing a $_POST[''] from a form doing a file upload
(i.e. having enctype="multipart/form-data"), the redirect
doesn't work in IE if you don't have a space between
location: & http, i.e.
header("location:http://...)  vs
header("location: http://...)

if ($_POST['submit']=='Upload') {
// Process File and the redirect...
header("location: http://"..."/somewhere.php");
<form enctype="multipart/form-data" action="upload.php" method="POST">
    <input type="hidden" name="MAX_FILE_SIZE" value="20000">
    Your file: <input name="filename" type="file">
    <input name="submit" type="submit" value="Upload">

This only happens if all of the following are true:
header("location:http://...) with no space
Form being processed has enctype="multipart/form-data"

To fix the problem, simply add the space.

Hope this helps someone else.
morganaj at coleggwent dot ac dot uk
17 years ago
Here is another that may make your upload fall over.  If you are using Squid or similar proxy server make sure that this is not limiting the size of the HTTP headers. This took me weeks to figure out!
anders jenbo pc dk
13 years ago
A responce to admin at creationfarm dot com, Mac OS X and Windows running on a NTFS disk also uses a multi stream file system. Still only the data stream in transfared on http upload. It is preferable to pack Mac OS X files in .dmg files rathere then zip but the avarage user will find zip much easir and they are supported on more platforms.
tomcashman at unitekgroup dot com
17 years ago
For apache, also check the LimitRequestBody directive.
If you're running a Red Hat install, this might be set in /etc/httpd/conf.d/php.conf.
By default, mine was set to 512 KB.
oliver dot schmidt at drehsinn dot de
14 years ago
If you want to use open_basedir for securing your server (which is highly recommended!!!) remember to add your tmp dir to the open_basedir value in php.ini.

Example: open_basedir = <your htdocs root, etc...>:/tmp

(Tested on gentoo Linux, Apache 2.2, PHP 5.1.6)
sebastian at drozdz dot ch
17 years ago
It's important that the variable 'open_basedir' in php.ini isn't  set to a directory that doesn't not includes tempupload directory
To Top