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PHP - How to set variables without having user input with a form

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So I am studying how the Google search engine works and how it preforms queries to gain a better understanding of how to collect data and sort through that data.  Now, I am messing around with some forms to figure out how the actual system takes in the values. When I look at the actual page code(the code generated by the php) I only see, in the search form, that there is a text field and a submit button. Now i know to set a text field's name to "q" but how to I set it up so that it can go to google images and not just google web search. I am trying to use the following format.

what would I add so that it would go to goog;le images instead
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Hello, Rocky.

By the default, the server could not guess where the search should be triggered only passing the parameter "q". If I understand your scenario, you want to create a search where the user can input some words and then redirect the users to image's section. Try setting the "tbm" parameter to "isch" like below:

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