Starting httpd: httpd: Syntax error on line 196 of /etc/httpd/conf/httpd.conf: Cannot load /etc/httpd/modules/mod_file_cache.so into server: /etc/httpd/modules/mod_file_cache.so: cannot open shared object file: No such file or directory
Thats not actually a PHP error, that just means you have the system configured to use mod_file_cache and you dont have that module installed, or the path is wrong. Unless you know you are using file_cache (which is unlikely unless you are doing reverse proxying or something) then you can comment that out.
To downgrade an rpm you can use the --downgrade switch, you'll need to download the rpms you want to downgrade or you can use yum downgrade php. You'll want to read up on both of those options as php has lots of dependencies and you dont want to clobber the wrong thing.
Ok, i have a problem with mysql
Seems not to be up
What error do you get when you try to start mysql?
Into phpmyadmin i have a warning about lib PHP MySQL 5.0.90 is different than MySQL 5.1.55. into server
You can ignore that.