Cant get $_POST values from multiple forms

i got a bit of a problem, as you guys can see in my code, i got a foreach looping through my img folder, showing all the images, well i left out the proper styling of the images, since the problem is the form inside every image.

i need to get the value from the radio input, so i can tell my other script to select all the info from the DB where the ID has the same value as the input.

and i needed a if statement so that if nothing is set i can show something saying you need to select a radio before you can listen to any stations.

but my if statement keeps showing 'error', even tho i click on the buttons

i hope anyone could help me out :)

if(isset($_POST['submitRadio')):
    $test = $_POST['radio'];
    echo $test;
else:
    echo 'error';
endif;

foreach(glob('img/radios/big/*.png') as path):
    printf('
        <form method="post">
            <input class="hidden" type="text" name="radio"  value="1">
            <input type="submit" name="submitRadio" value="Go!">
        </form>
    ');
endforeach;