[PHP] Site Searchable function

[Kevin A Williams]

Hi,

I was wondering whether anyone could direct me in the direction of creating a search 
function like the one on php.net?

I have tried looking rather fruitlessly to implement a system, would one possible 
implementation be to use reference files for the information and then use string 
matching to analyse the information, or search the source .php files (although 
security issues of revealing scripts).

Thanks in advance