PHP post max size overrides upload max filesize

Question

In my site host  I have seen  via phpinfo  that    post max size   8Mb upload max filesize   16Mb   This led me to think that I should be able to upload as file as big as 16Mb  However  when I do this through a post method  as normal   post max size takes over and declares that I sent too much   What is the method which permits sending a file as big as 16Mb   GET - PUT - other    Hope someone can clarify this for me   Simon

User · Answer

The normal method to send a file upload is POST, thus also post_max_size should be 16 Mb or more.

Incidentally, also memory_limit plays a role. It should be bigger than 16Mb, but since the default value is 128Mb, you won't see this problem. Example php.ini configuration:

post_max_size = 16M
upload_max_filesize = 16M
memory_limit = 128M

Change these value in php.ini if you've access to it, otherwise you can try to change them in an .htaccess file.

php_value upload_max_filesize 16M
php_value post_max_size 16M

This will work only if the AllowOverride settings permit it. Otherwise, you've to ask to your hosting company.

User · Answer

post max size   Sets max size of post data allowed  This setting also affects file upload To upload large files  this value must be larger than upload max filesize Generally speaking  memory limit should be larger than post max size  PHP Default  8M  upload max filesize   The maximum size of an uploaded file PHP Default  2M   memory limit  gt  post max size  gt  upload max filesize PHP Default  128M  gt  8M  gt  2M By default  post max size should be 4 times greater than upload max filesize  In turn memory limit should be 16 times greater than post max size

User · Answer

change in php ini max input vars   1000

User · Answer

By POST file uploads are done  commonly  there are also other methods   Look into the method attribute of the form which contains the file-upload field     The lowest limit of any related setting supersedes a higher setting    post max size upload max filesize memory limit   See Handling file uploads  Common Pitfals which explains this in detail and how to calculate the values

User · Answer

upload max filesize is the limit of any single file  post max size is the limit of the entire body of the request  which could include multiple files   Given post max size   20M and upload max filesize   6M you could upload up to 3 files of 6M each  If instead post max size   6M and upload max filesize   20M then you could only upload one 6M file before hitting post max size  It doesn t help to have upload max size   post max size   It s not obvious how to recognize going over post max size    POST and   FILES will be empty  but   SERVER  CONTENT LENGTH   will be   0  If the client just didn t upload any post variables or files  then   SERVER  CONTENT LENGTH   will be 0

User · Answer

Your server configuration settings allows users to upload files upto 16MB  because you have set upload max filesize   16Mb  but the post max size accepts post data upto 8MB only  This is why it throws an error  Quoted from the official PHP site    To upload large files  post max size value must be larger than upload max filesize   memory limit should be larger than post max size    You should always set your post max size value greater than the upload max filesize value

[php] PHP post_max_size overrides upload_max_filesize

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