The following form allows you to pick which service to submit your search criteria to and creates and submit the appropiate form to it. A form is created using PHP which has the necessary criteria specified, and can be extended.

PHP : Multi-Search Form

Search multiple search engines or other search services using only one form. The following form allows you to pick which service to submit your search criteria to and creates and submit the appropiate form to it. This service could be a search engine like AltaVista or Ask Jeeves, or even lookup services like E*TRADE's Stock Quote, Webster's Dictionary or Internic's Whois. It doesn't matter.

A form is created using PHP which has the necessary criteria specified, and can easily be extended by adding your own services to it. This script also allows for an unlimited number of hidden fields you can specify with the search.