<?php $sel_subject['visible'] = 0; ?>
<input type="radio" name="visible" value="0"<?php if($sel_subject['visible'] === 0) { echo " checked"; } ?>/> No
<input type="radio" name="visible" value="1"<?php if($sel_subject['visible'] == 1) { echo " checked"; } ?>/> Yes
<?php $sel_subject['visible'] = 1; ?>
<input type="radio" name="visible" value="0"<?php if($sel_subject['visible'] === 0) { echo " checked"; } ?>/> No
<input type="radio" name="visible" value="1"<?php if($sel_subject['visible'] == 1) { echo " checked"; } ?>/> Yes