Form met een radio button werkt niet?

    <div class="control-group">
      <!-- Username -->
      <label class="control-label"  for="my">Users involved</label>
      <div class="controls"><?php if(isset($_POST['my'])) echo 'true'; else echo 'false' ?>
        <!-- <input type="text" id="username" name="forUserT" placeholder="" value="<?php echo $row['forUser'] ?>" class="form-control"> -->
        <input type="radio" name="my" placeholder="" value="1" class="form-control" />
    	1
    	<input type="radio" name="my" placeholder="" value="2" class="form-control" /> 2
        <p class="help-block">Please enter all the users involved, devided by a comma and space ("user1, user2"). If every admin is involved please enter PUBLIC.</p>
      </div>
    </div>

    <div class="control-group">
      <!-- E-mail -->
      <label class="control-label" for="percentage">Percentage</label>
      <div class="controls">
       <!-- <input type="text" id="email" name="percentage" placeholder="" value="<?php echo $row['percentage'] ?>" class="form-control"> -->
        <input type="text" id="email" name="percentage" value="" class="slider form-control" data-slider-min="0" data-slider-max="100" data-slider-step="1" data-slider-value="<?php echo $sliderpercentage ?>" data-slider-orientation="horizontal" data-slider-selection="before" data-slider-tooltip="show" data-slider-id="blue" style="width: 250px; background-: #f56954 !important">
        <p class="help-block">Please enter the current percentage.</p>
      </div>
    </div>