我遇到了一个问题，我无法弄清楚。我的所有其他表格都可以正常工作。但登录表单需要完成2次才能执行。
我需要输入用户名和密码，提交表单，然后刷新页面。 当我输入用户名/密码并第二次提交时，功能起作用并转到 profile.php
登录.php
<?php
require_once("../Style/user-navigation.php");
require_once("../System/class.user.php");
$user = new USER();
if($user->is_loggedin()!=""){
?><script> location.replace("Home.php?action=select&id=<?php echo $userRow['id']; ?>"); </script>
<?php
}
if(isset($_POST['btn-login'])){
$username = strip_tags($_POST['username']);
$password = strip_tags($_POST['password']);
if($user->doLogin($username,$password)){ ?>
<script> location.replace("Home.php?action=select&id=<?php echo $userRow['id']; ?>"); </script>
<?php
}
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body class="nav-md" style="background-image: url('https://zellox.com/wp-content/uploads/2016/05/background-website-%E2%80%AB1%E2%80%AC-1600x900.gif');">
<!-- page content -->
<div class="clearfix"></div>
<a class="hiddenanchor" id="signin"></a>
<div class="login_wrapper">
<div class="animate form login_form">
<section class="login_content">
<form method="post">
<h1>Login Form</h1>
<div>
<input type="text" class="form-control" name="username" placeholder="Username" required="" />
</div>
<div>
<input type="password" class="form-control" name="password" placeholder="Password" required="" />
</div>
<div>
<button type="submit" name="btn-login" class="btn btn-primary ">Log In</button>
<a class="reset_pass" href="#">Lost your password?</a>
</div>
<div class="clearfix"></div>
<div class="separator">
<p class="change_link">New to site?
<a href="Register.php" class="to_register"> Create Account </a>
</p>
<div class="clearfix"></div>
<br />
</div>
</form>
</section>
</div>
</div>
</div>
<!-- /page content -->
</body>
</html>
以及后端代码“class.user.php”登录功能
public function doLogin($username,$password){
try
{
$stmt = $this->conn->prepare("SELECT id, username, password FROM users WHERE username=:username");
$stmt->execute(array(':username'=>$username));
$userRow=$stmt->fetch(PDO::FETCH_ASSOC);
if($stmt->rowCount() == 1)
{
if($password= $userRow['password'])
{
$_SESSION['user_session'] = $userRow['id'];
return true;
}
else
{
return false;
}
}
}
catch(PDOException $e)
{
echo $e->getMessage();
}
}
最佳答案
在使用 session 和 HTML 之前添加它:
session_start();
关于PHP登录表单需要提交2次，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44908610/