There are two values ​​in php.ini

; Maximum allowed size for uploaded files.
 upload_max_filesize = 32M

; Maximum size of POST data that PHP will accept.
post_max_size = 32M

In fact, according to his notes have talked about
One is the maximum limit upload files
One is the transfer value of the maximum limit POST

Because in general

Files are transferred using POST more
So La
Two have set the target size will be useful Oh