程序逻辑有有关问题，请帮忙

<?php<br />$arr = array(<br />	0 => array('id'=>12,'name'=>'NO.1'),<br />	1 => array('id'=>13,'name'=>'NO.2'),<br />);<br /><br />$_check_id = 0;<br />if($arr) {<br />foreach($arr as $v){<br />?><br /><input type="radio" name="c" id="d_<?php echo $v['id']?>" value="<?php echo $v[id]?>" /><?php echo $v['name']?><br><br /><?php <br />}<br />}?>

<br /><br />	$arr = array(<br />    0 => array('id'=>12,'name'=>'NO.1'),<br />    1 => array('id'=>13,'name'=>'NO.2'),<br />    2 => array('id'=>14,'name'=>'NO.3'),<br />    3 => array('id'=>15,'name'=>'NO.4'),<br />	);<br />	<br />	$_check_id = 14;<br />	$found = false;<br />	$htmls = array();<br />	if($arr) {<br />		foreach($arr as $v){<br />			$input_pre = <<<EOT<br />				<input type="radio" name="c" id="d_{$v['id']}" value="{$v['id']}"<br />EOT;<br />			$input_post = <<<EOT<br />				/>{$v['name']}<br />EOT;<br />			if(!$found && $_check_id == $v['id']) {<br />				$found = true;<br />				$input_pre .= ' checked ';<br />			}<br />			$htmls[] = array($input_pre, $input_post);<br />		}<br />	}<br />	$htmlstr = '';<br />	foreach($htmls as $html) {<br />		if(!$found) {<br />			$html[0] .= ' checked ';<br />			$found = true;<br />		}<br />		$htmlstr .= implode('', $html);<br />	}<br />	echo $htmlstr;<br />

<?php<br />$arr = array(<br />    0 => array('id'=>12,'name'=>'NO.1'),<br />    1 => array('id'=>13,'name'=>'NO.2'),<br />    2 => array('id'=>14,'name'=>'NO.3'),<br />);<br /> <br />$_check_id = 0;<br />if($arr) {<br />  foreach($arr as &$v) {<br />    if($_check_id == $v['id']) {<br />      $v['check'] = ' checked';<br />      $_check_id = -1;<br />    }<br />  }<br />  if($_check_id >=0) $arr[0]['check'] = ' checked';<br />  foreach($arr as $v){<br />?><br /><input type="radio" name="c" id="d_<?php echo $v['id']?>" value="<?php echo $v['id']?>" <?php ;echo isset($v['check'])?$v['check']:''?> /><?php echo $v['name']?><br /><?php <br />}<br />}?>

<br />foreach($arr as $key=>$v){<br />	if($key == $_check_id){<br />	//这儿是checked<br />	continue;<br />	}<br />......<br />