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此网页有一个重定向循环ERR_TOO_MANY_REDIRECTS

这是我的代码,我遇到了问题,它说它有一个重定向循环

<?php
session_start();
require_once("db_connection.php");

if (!$connect) {
    die("Connection failed: " . mysqli_connect_error());
}

$username = $_POST['username'];
$password = $_POST['password'];

$query = "SELECT * FROM admins WHERE username='{$username}' AND password='{$password}'";
$result = mysqli_query($connect , $query);

if (isset($result)) {
    echo "success";
}

$rows = mysqli_fetch_assoc($result);

if(mysqli_num_rows($result)==1){
    $_SESSION['id'] = $rows['id'];
}

if(mysqli_num_rows($result)!=1 || !isset($rows['id'])){
    header("location: login.php");
}

?>

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当我尝试启动时,它会在浏览器上显示