File-based database - php vs xml vs ini

[AleSmith]

I want to create a user list and I want to use a 'simple-to-use' file-based databaseThe database must be file-based and to use no server, so it must be either a php, xml or ini file.Which one is the best for creating a user list ?My actual list looks like:\[code\]<?php $accounts = array() ;$accounts[1]['user'] = 'admin';$accounts[1]['password'] = '25e4ee4e9229397b6b17776bfceaf8e7';$accounts[1]['isActive'] = '1';$accounts[1]['rank'] = 'admin';$accounts[2]['user'] = 'admin2';$accounts[2]['password'] = '25e4ee4e9229397b6b17776bfceaf8e7';$accounts[2]['isActive'] = '0';$accounts[2]['rank'] = 'user';?>\[/code\]But the problem is that the operations have a delay - I must refresh the browser after any operation.Any solutions ?