php后台查出数据，输出在html表格里，如何做

$con=mysqli_connect('localhost','root','root','test');  //用户名和密码请自己修改
$a=mysqli_query($con,'select * from a');                  //表名自己修改
$html="";
while($rel=mysqli_fetch_assoc($a)){
    $html=$html."";
}
$html.'
id
name
{$rel['id']}
{$rel['name']}
';
file_put_contents('a.html',$html);