search facilities

Hi,
I have a content management system, for my database driven website developed 
using php and postgresql but I don't know how to develop a search facility 
for it.

How do I go about it?.

I have seen database driven website developed using php and postgresql and 
they have their built search facilities where can I learn to develop my 
customized search facility please do advice.

Kind Regards

+-----------------------------------------------------+
| Martin W. Kuria (Mr.) martin.kuria@unon.org
+----------------------------------------------------+

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