例
$this->Form->radio('gender', ['Masculine','Feminine','Neuter']);
出力結果
<input name="gender" value="" type="hidden">
<label for="gender-0">
<input name="gender" value="0" id="gender-0" type="radio">
Masculine
</label>
<label for="gender-1">
<input name="gender" value="1" id="gender-1" type="radio">
Feminine
</label>
<label for="gender-2">
<input name="gender" value="2" id="gender-2" type="radio">
Neuter
</label>
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