php和html混写,遍历出二维关联数组

<?php
	//下面是二维关联数组
	$arr_3 = array(array("id"=>2,"name"=>"lucy","age"=>26),
				   array("id"=>3,"name"=>"lili","age"=>27),
				   array("id"=>4,"name"=>"lisi","age"=>28),
				   );

?>
<!DOCTYPE html>
<html>
<head>
	<title></title>
</head>
<body>

<table border="1px black solid" width="20%" cellpadding="0" cellspacing="0" align="center">
	<tr align="center" bgcolor="green">
		<th>编号</th>
		<th>姓名</th>
		<th>年龄</th>
	</tr>
	<!--二维关联数组的2次遍历-->
	<?php foreach ($arr_3 as $key=>$row) { ?> 
	<tr align="center">
		<?php if(is_array($row)){
			foreach ($row as $col) {
					echo "<td align='center'>".$col."</td>";
			}
		}else{
			echo "<td >".$key.':'.$row."</td>";
		} ?>
	</tr> 
	<?php } ?>	
</table>
</body>
</html>

php和html混写,遍历出二维关联数组