A script isnt going to 100% protect you from ddos and httpd flooders, if you are on shared hosting your hosting company should arleady have preventative measures in place that will stop it long before it should reach you.
and bashy, be very careful using mod_security and mod_evasive if you enter a bad ruleset then its going to render you're server useless but they are great tools when used correctly. Also check out APF firewall and brute force detection to help reduce DDOs attacks
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