Php 标头位置在服务器上不起作用
嗨,朋友们,我试图在用户使用heade location登录后重定向页面,但它不起作用,无法理解原因 这是代码Php 标头位置在服务器上不起作用,php,redirect,Php,Redirect,嗨,朋友们,我试图在用户使用heade location登录后重定向页面,但它不起作用,无法理解原因 这是代码 <?php include "config.php"; ?> <?php session_start(); error_reporting(0); ini_set('display_errors', 0); if(isset($_SESSION['username'])){ header("Location: user_details.ph
<?php include "config.php"; ?>
<?php session_start();
error_reporting(0);
ini_set('display_errors', 0);
if(isset($_SESSION['username'])){
header("Location: user_details.php");
}
?>
这是我用php登录的html
<html>
<head>
</head>
<body>
<div id="form">
<form action="" method="POST">
<div class="login-block">
<h1>Login</h1>
<input type="text" value="" placeholder="Username" id="username" name="user"/>
<input type="password" value="" placeholder="Password" id="password" name="pass"/>
<button type="submit" id="btn" value="Login" name="login">Submit</button>
<?php
if(isset($_POST['login']))
{
$username=$_POST['user'];
$password=$_POST['pass'];
$username=mysqli_real_escape_string($conn,$username);
$password=mysqli_real_escape_string($conn,$password);
$password=md5(mysqli_real_escape_string($conn,$password));
$query="SELECT * FROM user WHERE username = '{$username}' and password='{$password}'";
$select_user_query=mysqli_query($conn,$query);
if(!$select_user_query)
{
die("Connection failed".mysqli_error($conn));
}
while($row=mysqli_fetch_array($select_user_query))
{
$db_user_id=$row['id'];
$_SESSION['username']=$row['username'];
$db_user_email=$row['email'];
$db_user_password=$row['password'];
}
if($username === $_SESSION['username'] && $password ===$db_user_password)
{
header("location: titles.php");
}
else
{
echo "<p style='color:#FF7B81'> enter correct username and password <p>";
}
}
?>
</div>
</form>
</div>
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提交
这条线永远不会起作用:
header("location: titles.php");
as头必须在任何形式的输出之前发送。通常的做法是将isset($_POST['submit'])放在HTML块上方,并分配您可能希望放入HTML中供以后使用的变量
尝试重新格式化代码,如下所示:
<?php
if(isset($_POST['login']))
{
$username=$_POST['user'];
$password=$_POST['pass'];
$username=mysqli_real_escape_string($conn,$username);
$password=mysqli_real_escape_string($conn,$password);
$password=md5(mysqli_real_escape_string($conn,$password));
$query="SELECT * FROM user WHERE username = '{$username}' and password='{$password}'";
$select_user_query=mysqli_query($conn,$query);
if(!$select_user_query)
{
die("Connection failed".mysqli_error($conn));
}
while($row=mysqli_fetch_array($select_user_query))
{
$db_user_id=$row['id'];
$_SESSION['username']=$row['username'];
$db_user_email=$row['email'];
$db_user_password=$row['password'];
}
if($username === $_SESSION['username'] && $password ===$db_user_password)
{
header("location: titles.php");
}
else
{
$error = "<p style='color:#FF7B81'> enter correct username and password <p>";
}
}
?>
<html>
<head>
</head>
<body>
<div id="form">
<form action="" method="POST">
<div class="login-block">
<h1>Login</h1>
<input type="text" value="" placeholder="Username" id="username" name="user"/>
<input type="password" value="" placeholder="Password" id="password" name="pass"/>
<button type="submit" id="btn" value="Login" name="login">Submit</button>
<?PHP if(isset($error)){ echo $error; } ?>
</div>
在分配任何会话变量之前
试试这个
您必须启动对象
// Add this start of file after <?php
ob_start();
//在
登录
提交
在重定向之前,不能将输出发送到浏览器。在头重定向之后,还应该有一个出口。一旦输出启动,将无法工作。请尝试使用@Rasclatt。一旦用户正确登录,我想重定向,因此在输出后,只有我可以重定向echo“”;您可以使用@Kaylined的答案修复html的最后一部分,并在开头添加session\u start()
。您也可以随机使用session,在使用session vars之前,您需要添加session\u start()。我已经编辑了一些内容,其中包括输出缓冲不仅仅是ob\u start()
,而这个代码片段可以解决这个问题,真正有助于提高文章的质量。请记住,您将在将来回答读者的问题,这些人可能不知道您的代码建议的原因。还请尽量不要用解释性注释挤满你的代码,这会降低代码和解释的可读性!
// Add this start of file after <?php
ob_start();
<html>
<head>
</head>
<body>
<div id="form">
<form action="" method="POST">
<div class="login-block">
<h1>Login</h1>
<input type="text" value="" placeholder="Username" id="username" name="user"/>
<input type="password" value="" placeholder="Password" id="password" name="pass"/>
<button type="submit" id="btn" value="Login" name="login">Submit</button>
<?php
if(isset($_POST['login']))
{
$username=$_POST['user'];
$password=$_POST['pass'];
$username=mysqli_real_escape_string($conn,$username);
$password=mysqli_real_escape_string($conn,$password);
$password=md5(mysqli_real_escape_string($conn,$password));
$query="SELECT * FROM user WHERE username = '{$username}' and password='{$password}'";
$select_user_query=mysqli_query($conn,$query);
if(!$select_user_query)
{
die("Connection failed".mysqli_error($conn));
}
while($row=mysqli_fetch_array($select_user_query))
{
$db_user_id=$row['id'];
$_SESSION['username']=$row['username'];
$db_user_email=$row['email'];
$db_user_password=$row['password'];
}
if($username === $_SESSION['username'] && $password ===$db_user_password)
{
//header("location: titles.php");
echo "<script>window.location.href='titles.php'</script>";
}
else
{
echo "<p style='color:#FF7B81'> enter correct username and password <p>";
}
}
?>
</div>
</form>
</div>