Can you get the value of an Input from the Input name?

Using PHP, and I am trying to get the value of an Input field by getting the Input name.

I have a Gravity Form poll which has two radio button inputs.

(Apparently in Gravity Form, polls are not treated as radio buttons, so I cannot set the value from the form edit or creation.)

In the Chrome inspector, I can see the two inputs which look like this:

<input name="input_1" type="radio" value="gpoll72c" id="choice_1234_1_0">
<input name="input_1" type="radio" value="gpoll288" id="choice_1234_1_1">

I need to know which of these two poll radio buttons were selected upon the poll (form) submission.

I tried to use $_GET['input_1'].

I used an alert() which only displayed a blank window.

I was hoping to at least see either gpoll72c or gpoll288 in the alert, but nothing.

Is there another way I can do this? Am I doing this wrong? If so, how can I fix it?

Please help.

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