如何在登录网站后显示用户名？

Question

我正在设计一个网站与登录页面，登录部分和从 db 获取的内容工作正常， 但是我想登录后在主页上显示用户名。我用的 session start ()没有效果，用户名还是没有显示。我查过类似的问题，但都不是我想要的答案。

下面是代码：

 $email = mysqli_real_escape_string($con,$_POST['user']);
$pass = mysqli_real_escape_string($con,$_POST['pass']);
$sel_user = "select * from admins where email='$email' AND password='$pass'";
$run_user = mysqli_query($con, $sel_user);
$check_user = mysqli_num_rows($run_user);
if($check_user>0)
{
$_SESSION['email']=$email
echo "<script>window.open('index2.html','_self')</script>";
}
else {
echo "<script>alert('Email or password is not correct, try again!')</script>";
}

index2.html :

<?php
       session_start();
?>
    <div class="inline-block">
                                <h5 class="no-margin"> Welcome </h5>
                                <h4 class="no-margin"> <?php echo $_SESSION['email']; ?> </h4>
                                <a class="btn user-options sb_toggle">
                                    <i class="fa fa-cog"></i>
                                </a>
                            </div>

Answer 1

Try below code:

First code:

session_start();
$email = mysqli_real_escape_string($con,$_POST['user']);
$pass = mysqli_real_escape_string($con,$_POST['pass']);
$sel_user = "select * from admins where email='$email' AND password='$pass'";
$run_user = mysqli_query($con, $sel_user);
$check_user = mysqli_num_rows($run_user);
if($check_user>0)
{
    $_SESSION['email']=$email
    echo "<script>window.open('index2.html','_self')</script>";
}
else {
    echo "<script>alert('Email or password is not correct, try again!')</script>";
}

index2.php :

<?php session_start(); ?>
<div class="inline-block">
    <h5 class="no-margin"> Welcome </h5>
    <h4 class="no-margin"> <?php echo $_SESSION['email']; ?> </h4>
    <a class="btn user-options sb_toggle">
        <i class="fa fa-cog"></i>
    </a>
</div>

It should work.