php - Send Bootstrap Button-Group value in a form with Get or Post

I created this form with bootstrap 3:

Im using the button group, because it looks better then a dropdwon menue or just checkboxes.

I tried to send the btn-group value by the _get methode but it does not work.
So how can in submit the value with my _get methode to my PHP file?

Thank you for helping

Answer

I found a solution

                            

                            
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