我一直在工作的网站是我一段时间以来一直在处理的问题,现在我知道它为什么会发生,但不知道如何解决。请帮忙!!
第1页:在第一页中,将登录页面集$_SESSION['user_id']
设置为在数据库用户ID中获取的值。在同一页面上可以打印会话,并且可以正常工作($_SESSION['user_id']
已打印),还可以浏览下一页(用户主页)。
第2页:在第2页(用户主页)中,$_SESSION['user_id']
变为空值,为什么会发生这种情况?最有可能看到此问题,忘记设置会话开始,但是我在两个页面上都设置了会话开始...
第1页
<?php
if (isset($_POST['sub'])) {
$user = $_POST['user'];
$pass = $_POST['pass'];
$con = mysqli_connect("localhost", "root", "");
$db = mysqli_select_db($con, "Database");
$qry = "select * from TABLE where username='$user' and password='$pass'";
$res = mysqli_query($con, $qry) or die("could not connect to mysql");
$row = mysqli_fetch_array($res);
$len = mysqli_num_rows($res);
if ($len <= 0) {
echo "<script>";
echo "alert('Oops.Username Or Password Incorrect!');window.location.href='login.php';";
echo "</script>";
} else {
session_start();
$_SESSION['id'] = $row['id'];
$_SESSION['message'] = $user;
$_SESSION['logout'] = "";
$id = $_SESSION['id'];
echo "<script>";
echo "alert('log in Success $id ');window.location.href='login.php';"; //$id is print correctly
echo "</script>";
}
}
?>
第2页
<?php
ob_start();
session_start();
if (isset($_SESSION['id'])) {
$id = $_SESSION['id'];
echo "$user"; // not printed
}
if (isset($_SESSION['message'])) {
$msg = $_SESSION['message'];
$_SESSION['message'] = "";
}
if (isset($_SESSION['logout'])) {
$msg = $_SESSION['logout'];
if ($msg == 'logout') {
header("location:login.php");
$_SESSION['message'] = "you must login first";
exit(0);
}
}
?>
<?php
echo "welcome"; // only print this string the above session are not work
?>
我也在某些项目之前也使用了此代码,它可以正常工作,然后为什么这次会话值不起作用?
使用首页开头的会话,就像这样。希望这会起作用
<?php
session_start();
if (isset($_POST['sub']))
{
$user=$_POST['user'];
$pass=$_POST['pass'];
$con=mysqli_connect("localhost","root","");
$db=mysqli_select_db($con,"Database");
$qry="select * from TABLE where username='$user' and password='$pass'";
$res=mysqli_query($con,$qry)or die("could not connect to mysql");
$row=mysqli_fetch_array($res);
$len=mysqli_num_rows($res);
if($len<=0)
{
echo"<script>";
echo"alert('Oops.Username Or Password Incorrect!');window.location.href='login.php';";
echo"</script>";
}
else
{
$_SESSION['id']=$row['id'];
$_SESSION['message']=$user;
$_SESSION['logout']="";
$id=$_SESSION['id'];
echo"<script>";
echo"alert('log in Success $id ');window.location.href='login.php';"; //$id is print correctly
echo"</script>";
}
}
?>