To restricts Users from uploading File Size, we can configure Apache with LimitRequestBody Directive. You can add this directive using .htaccess file or httpd.conf file under virtual host or directory configuration options. You can set value (in bytes) from 0 (unlimited) to 2147483647 (2GB) that are allowed in a request body.
For example, limit /var/www/html/example.com/uploads to 200K, you might use the following directive (add to .htaccess or httpd.conf file):
Restart Apache Server, if added to httpd.conf.
# service httpd restart