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php - 全局 $_SESSION 变量

问题描述

我一直在关注Dani Krossings 登录系统，这是一个很棒的教程，正是我正在寻找的，只有一件事我正在努力解决。

登录后，标题不会刷新。登录后，标题应更改为 ...Profile Page, Logout。我的代码保留为注册，登录。就像 $_SESSION 变量没有到达标题一样。但是，如果在登录后，我选择了注册或登录链接，则标题会更改为应有的内容。

功能码

function uidExists($conn, $username) {
  $sql = "SELECT * FROM users WHERE usersUid = ? OR usersEmail = ?;";
    $stmt = mysqli_stmt_init($conn);
    if (!mysqli_stmt_prepare($stmt, $sql)) {
        header("location: ../signup.php?error=stmtfailed");
        exit();
    }

    mysqli_stmt_bind_param($stmt, "ss", $username, $username);
    mysqli_stmt_execute($stmt);

    // "Get result" returns the results from a prepared statement
    $resultData = mysqli_stmt_get_result($stmt);

    if ($row = mysqli_fetch_assoc($resultData)) {
        return $row;
    }
    else {
        $result = false;
        return $result;
    }

    mysqli_stmt_close($stmt);
}

function loginUser($conn, $username, $pwd) {
    $uidExists = uidExists($conn, $username);

    if ($uidExists === false) {
        header("location: ../login.php?error=wronglogin");
        exit();
    }

    $pwdHashed = $uidExists["usersPwd"];
    $checkPwd = password_verify($pwd, $pwdHashed);

    if ($checkPwd === false) {
        header("location: ../login.php?error=wronglogin");
        exit();
    }
    elseif ($checkPwd === true) {
        session_start();
        $_SESSION["userid"] = $uidExists["usersId"];
        $_SESSION["useruid"] = $uidExists["usersUid"];
        header("location: ../index.php?error=none");
        exit();
    }
}

头文件.php

<?php
  session_start();
  include_once 'includes/functions.inc.php';
?>

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>PHP Project 01</title>
    <!--I won't do more than barebone HTML, since this isn't an HTML tutorial.-->
    <link href="https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;0,900;1,100;1,300;1,400;1,500;1,700;1,900&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="css/reset.css">
    <link rel="stylesheet" href="css/style.css">
  </head>
  <body>

    <!--A quick navigation-->
    <nav>
      <div class="wrapper">
        <a href="index.php"><img src="img/logo-white.png" alt="Blogs logo"></a>
        <ul>
          <li><a href="index.php">Home</a></li>
          <li><a href="discover.php">About Us</a></li>
          <li><a href="blog.php">Find Blogs</a></li>
          <?php
            if (isset($_SESSION["useruid"])) {
              echo "<li><a href='profile.php'>Profile Page</a></li>";
              echo "<li><a href='logout.php'>Logout</a></li>";
            }
            else {
              echo "<li><a href='signup.php'>Sign up</a></li>";
              echo "<li><a href='login.php'>Log in</a></li>";
            }
          ?>
        </ul>
      </div>
    </nav>

<!--A quick wrapper to align the content (ends in footer.php)-->
<div class="wrapper">

登录.php

<?php
include_once 'header.php';

?>

<section class="signup-form">
  <h2>Log In</h2>
  <div class="signup-form-form">
    <form action="includes/login.inc.php" method="post">
      <input type="text" name="uid" placeholder="Username/Email...">
      <input type="password" name="pwd" placeholder="Password...">
      <button type="submit" name="submit">Sign up</button>
    </form>
  </div>
  <?php
    // Error messages
    if (isset($_GET["error"])) {
      if ($_GET["error"] == "emptyinput") {
        echo "<p>Fill in all fields!</p>";
      }
      else if ($_GET["error"] == "wronglogin") {
        echo "<p>Wrong login!</p>";
      }
    }
  ?>
</section>

<?php
  include_once 'footer.php';
?>

登录.inc.php

<?php

if (isset($_POST["submit"])) {

  // First we get the form data from the URL
  $username = $_POST["uid"];
  $pwd = $_POST["pwd"];

  // Then we run a bunch of error handlers to catch any user mistakes we can (you can add more than I did)
  // These functions can be found in functions.inc.php

  require_once 'dbh.inc.php';
  require_once 'functions.inc.php';

  // Left inputs empty
  if (emptyInputLogin($username, $pwd) === true) {
    header("location: ../login.php?error=emptyinput");
        exit();
  }

  // If we get to here, it means there are no user errors

  // Now we insert the user into the database
  loginUser($conn, $username, $pwd);

} else {
    header("location: ../login.php");
    exit();
}

有人对我如何在提交成功的登录表单时刷新标题有任何想法吗？

标签： php

解决方案

由于有时在重新加载页眉后会在页面上留下一些内容，因此我们需要在die()从页眉更改位置后使用。

TBH，不推荐使用 PHP 重定向，我建议您使用内置 JavaScript 函数重定向用户，window.location.replace(path)

您可以在 PHP 脚本中使用

  ?>
    <script>
      window.location.replace(path)
    </script>
  <?php

或者只是创建自己的函数：

function redirect($path) {
  ?>
    <script>
      window.location.replace('<?php echo $path ?>')
    </script>
  <?php
}

并使用它：redirect("profile.php")

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