PHP把文本文档的内容按行输出来以后，如何按下图的形式显示出来

//写入文本
$myfile = fopen("newfile.txt", "a+") or die("Unable to open file!");
$username=@$_POST[username];
fwrite($myfile, $username);

$password=@$_POST[password]."
";
fwrite($myfile, $password);

//读取文件
$myfile = fopen("newfile.txt", "r") or die("Unable to open file!");
// 

用户名
密码
 
删除

    
    



$path = 'D:\wamp\www\a.txt';
$f = fopen($path, "r");
echo "用户名"." " ."密码"." 操作
";
while(!feof($f))
{
    if (!feof($f)){
        $buffer = fgets($f, 4096);
        $arr = explode("
------解决思路----------------------
",$buffer);
        if(count($arr) > 1){
            echo $arr[0]." " . $arr[1]." 删除
";
        }
    }
}
fclose($f);
?>

$username = $_POST['username'];
$password = $_POST['password'];
$path = 'D:\wamp\www\a.txt';
$fp = fopen($path,"a");
fwrite($fp,$username."
------解决思路----------------------
".$password."\r\n");
fclose($fp);
header("Location:form.php");
?>

用户名 密码 操作
11 22 删除
33 44 删除
55 66 删除
ss dd 删除
s sss 删除