6.1.3 Changing server parameters using the example of parameters such as: upload_max_filesize, post_max_size
These edits must be made in the PHP.INI file in the files at: /etc/php5/apache2/php.ini and /etc/php5/cgi/php.ini
For example, you need to set a limit for uploading files to 64MB:
upload_max_filesize = 64M
Important: After editing the specified files, you must restart the Apache web service to apply the new settings. This can be done in ISPManager as root in the “Services” section.