upload_max_filesize is one of the important directive on php.ini file. In this directive we can mention the maximum upload file size for a website. Normally there is only one php configuration file for all domains under a shared environment there fore any changes made on that will effect all domains under that server.
We can mannually set some options for a particular user by editting the .htaccess file under the public(public_html) folder.We can simply edit the .htaccess file from file manager or from back-end. The htaccess file entries are listed below,
php_value post_max_size 3M
php_value upload_max_filesize 3M
Thats it… 🙂