can't reinstall php

[Pet <petshmidt@googlemail.com>]

Hi,

what I did:

1. apt-get remove php5
2. installed php5.1.6 from sources (just needed it for old scripts)
3. then removed 5.1.6 manually
4. tried to install apt-get install php5 again
5. now php -v produce: bash: php: command not found
6. tried apt-get install php5-cli error:Not replacing deleted config
file /etc/php5/cli/php.ini

I just wont now working apache with php, but if I run an php file in
browser, it offers download it.
No idea now hot to repair my apache+php installation.

Any help would be appreciated