Retrieving data from form results on external website with PHP

How I might go about writing a script that inputs and submits a form on an external website, allowing me to then harvest the results?

Obviously the forms I'm referring to make use of $_POST rather than $_GET, otherwise I could use the full URL with query string to harvest whatever I need.

Any pointers in the right direction greatly appreciated - not even entirely sure what to search for, I only seem to be able 开发者_开发问答to find how to either harvest data from raw html or process forms (both of which I can do, neither of which are what I'm looking for).

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The right answer is bedind this doors: PHP: cURL - Manual