Php 登录页面不起作用
当我第一次打开登录页面时，即使我使用了正确的用户名和密码，登录页面也不会被重定向到主页。但在第二次登录时，它被正确地重定向到主页。login.php的代码如下所示Php 登录页面不起作用,php,Php,当我第一次打开登录页面时，即使我使用了正确的用户名和密码，登录页面也不会被重定向到主页。但在第二次登录时，它被正确地重定向到主页。login.php的代码如下所示 <?php session_start(); $_SESSION['login_user'] = false; ?> <?php session_start(); $username=""; $password=""; $usernameErr=""; $passwordErr="
<?php
session_start();
$_SESSION['login_user'] = false;
?>
<?php
session_start();
$username="";
$password="";
$usernameErr="";
$passwordErr="";
$empty=false;
$_SESSION['login_user'] = false;
if(isset($_POST['submit']))
{
if(empty($_POST['username']))
{
$empty=true;
$usernameErr="Username is empty. Please try again";
}
else
{
$username=$_POST['username'];
}
if(empty($_POST['password']))
{
$empty=true;
$passwordErr="Password is empty. Please try again";
}
else
{
$password=$_POST['password'];
}
if(!$empty)
{
$servername="myxor.in.mysql";
$dbusername="myxor_in";
$dbpassword="srikanth177";
$dbname="myxor_in";
$conn=new mysqli($servername, $dbusername, $dbpassword, $dbname);
if($conn->connect_error)
{
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT firstname,package,username,password FROM users WHERE username='$username'";
$result = $conn->query($sql);
if (($result->num_rows) > 0)
{
$row = $result->fetch_assoc();
if($username === $row['username'])
{
if($password === $row['password'])
{
$_SESSION['fname'] = $row['firstname'];
$_SESSION['pack'] = $row['package'];
//$_SESSION['login_user'] = $username;
$_SESSION['login_user'] = true;
header('Location: http://www.myxor.in/home.php');
exit;
}
else
{
$passwordErr = "Invalid Password. Please Try Again";
}
}
} else
{
$usernameErr = "Invalid Username. Please Try Again";
}
}
}
else echo "submit not set";
echo $usernameErr;
echo "<br>";
echo $passwordErr;
?>
<?php
session_start();
$_SESSION['login_user'] = false;
?>
<?php
session_start();
$username="";
$password="";
$usernameErr="";
$passwordErr="";
$empty=false;
$_SESSION['login_user'] = false;
if(isset($_POST['submit']))
{
if(empty($_POST['username']))
{
$empty=true;
$usernameErr="Username is empty. Please try again";
}
else
{
$username=$_POST['username'];
}
if(empty($_POST['password']))
{
$empty=true;
$passwordErr="Password is empty. Please try again";
}
else
{
$password=$_POST['password'];
}
if(!$empty)
{
$servername="myxor.in.mysql";
$dbusername="myxor_in";
$dbpassword="srikanth177";
$dbname="myxor_in";
$conn=new mysqli($servername, $dbusername, $dbpassword, $dbname);
if($conn->connect_error)
{
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT firstname,package,username,password FROM users WHERE username='$username'";
$result = $conn->query($sql);
if (($result->num_rows) > 0)
{
$row = $result->fetch_assoc();
if($username === $row['username'])
{
if($password === $row['password'])
{
$_SESSION['fname'] = $row['firstname'];
$_SESSION['pack'] = $row['package'];
//$_SESSION['login_user'] = $username;
$_SESSION['login_user'] = true;
header('Location: http://www.myxor.in/home.php');
exit;
}
else
{
$passwordErr = "Invalid Password. Please Try Again";
}
}
} else
{
$usernameErr = "Invalid Username. Please Try Again";
}
}
}
else echo "submit not set";
echo $usernameErr;
echo "<br>";
echo $passwordErr;
?>
您应该在登录页面上打印会话变量。大概是这样的：
var_dump($_SESSION);
因此，当您输入登录信息并且在第一次尝试时没有重定向时，您将看到是否正在设置这些值。这是第一步。然后，您将更好地了解需要在文件中更改的内容。尝试使用以下代码
<?php
session_start();
$username="";
$password="";
$usernameErr="";
$passwordErr="";
$empty=false;
$_SESSION['login_user'] = false;
if(isset($_POST['submit']))
{
if(empty($_POST['username']))
{
$empty=true;
$usernameErr="Username is empty. Please try again";
}
else
{
$username=$_POST['username'];
}
if(empty($_POST['password']))
{
$empty=true;
$passwordErr="Password is empty. Please try again";
}
else
{
$password=$_POST['password'];
}
if(!$empty)
{
$servername="myxor.in.mysql";
$dbusername="myxor_in";
$dbpassword="srikanth177";
$dbname="myxor_in";
$conn=new mysqli($servername, $dbusername, $dbpassword, $dbname);
if($conn->connect_error)
{
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT firstname,package,username,password FROM users WHERE username='$username'";
$result = $conn->query($sql);
if (($result->num_rows) > 0)
{
$row = $result->fetch_assoc();
if($username == $row['username'])
{
if($password == $row['password'])
{
$_SESSION['fname'] = $row['firstname'];
$_SESSION['pack'] = $row['package'];
//$_SESSION['login_user'] = $username;
$_SESSION['login_user'] = true;
header('Location: http://www.myxor.in/home.php');
}
else
{
$passwordErr = "Invalid Password. Please Try Again";
}
}
} else
{
$usernameErr = "Invalid Username. Please Try Again";
}
}
}
else echo "submit not set";
echo $usernameErr;
echo "<br>";
echo $passwordErr;
?>
设置会话中可能存在一些问题。Pl.检查第二次登录页面时会话是否启用？首先，您应该检查$\u会话['login\u user']是否为true（如果为true），然后将其重定向到home.php，您应该在上面将$\u会话['login\u user']设置为true，以测试它是否真的到达了这一点。尝试类似的方式：echo“到达这里#1”您还需要放置一个临时出口在重定向之前，否则您将看不到消息显示。如果您没有看到“Got to here#1”消息，请在脚本中的其他位置放置另一条消息，然后查看该消息是否显示。这是一个基本的错误测试，用于缩小脚本运行的范围。如果您需要查看变量的内容，也可以将这些内容回显出来。