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Not possible to have "name" attribute to be an array name in $form->radio()

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Looks like it's not possible to have name attribute to have an array name. If you do this:
<?php echo $form->radio("color", "red", "red")." Red"; ?>
<?php echo $form->radio("color", "blue", "")." Blue"; ?>


it will give you this:
<input type="radio" checked="checked" class="ccm-input-radio" value="red" id="color1" name="color"> Red
<input type="radio" class="ccm-input-radio" value="blue" id="color2" name="color"> Blue


If you do this:
<?php echo $form->radio("color[]", "red", "red")." Red"; ?>
<?php echo $form->radio("color[]", "blue", "")." Blue"; ?>


it will give you this:
<input type="radio" checked="checked" class="ccm-input-radio" value="red" id="color[]1" name="color[]"> Red
<input type="radio" class="ccm-input-radio" value="blue" id="color[]2" name="color[]"> Blue


This prints out a correct "name" attribute but gives a wrong markup for "id". Looks like I have to use the direct html code instead of $form->radio() method.
BlueFractals