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My login form has username and password fields. When a user logs in with their username and password, I want to display the user's full name instead of their username. On the next page, I want to say welcome FULLNAME, not welcome USERNAME.

This is the html code of index.php or login page:

<form action="" method="POST">
            <div class="rows grid">
                
                <div class="row">
                    <label for="username">用戶名</label>
                    <input type="text" id="username" name="userName" placeholder="輸入用戶名" required>
                </div>
                <!--密碼-->
                <div class="row">
                    <label for="password">密碼</label>
                    <input type="password" id="password" name="passWord" placeholder="輸入密碼" required>
                </div>
                <!--提交按鈕-->
                <div class="row">
                    <input type="submit" id="submitBtn" name="submit" value="登錄" required>
                <!--注冊鏈接-->
                    <span class="registerLink">還沒有賬號？<a href="register.php">注冊</a></span>
                </div>
            </div>
        </form>
    </div>
    </div>

This is the php code:

<?php
// 提交
if(isset($_POST['submit'])){ 
// 存儲用戶名、密碼、郵箱、號碼
$userName = $_POST['userName'];
$passWord = $_POST['passWord'];
// 從數(shù)據(jù)庫中選擇
$sql = "SELECT * FROM admin WHERE 
    usernames = '$userName' AND
    passwords = '$passWord'";
// 執(zhí)行查詢
$result = mysqli_query($conn, $sql);
// 計(jì)算相同用戶名和密碼的帳戶數(shù)量
$count = mysqli_num_rows($result);
// 將結(jié)果計(jì)數(shù)到數(shù)組中
$row = mysqli_fetch_assoc($result);
// 檢查數(shù)據(jù)庫中是否有帳戶
if ($count == 1){
    $_SESSION['loginMessage'] = '<span class = "success">歡迎 '.$userName.'</span>';
    header('location:' .SITEURL. 'dashboard.php');
    exit(); 
}
else{
    $_SESSION['noAdmin'] = '<span class = "fail">請檢查您的用戶名和密碼，然后重試。</span>';
    header('location:' .SITEURL. 'index.php');
    exit();
    }
}
?>

This is register.php or registration link:

<form action="" method="POST">
                <div class="rows grid">
                    <!--全名-->
                    <div class="row">
                        <label for="fullname">全名</label>
                        <input type="text" id="fullname" name="fullName" placeholder="輸入全名" required>
                    </div>
                     <!--用戶名-->
                     <div class="row">
                        <label for="username">用戶名</label>
                        <input type="text" id="username" name="userName" placeholder="輸入用戶名" required>
                    </div>
                     <!--郵箱-->
                     <div class="row">
                        <label for="email">郵箱</label>
                        <input type="email" id="email" name="emaiL" placeholder="輸入郵箱" required>
                    </div>
                      <!--手機(jī)號碼-->
                      <div class="row">
                        <label for="number">手機(jī)號碼</label>
                        <input type="number" id="number" name="numbeR" placeholder="輸入手機(jī)號碼" required>
                    </div>
                    <!--密碼-->
                    <div class="row">
                        <label for="password">密碼</label>
                        <input type="password" id="password" name="passWord" placeholder="輸入密碼" required>
                    </div>
                    <!--提交按鈕-->
                    <div class="row">
                        <input type="submit" id="submitBtn" name="submit" value="注冊" required>
                    <!--已有賬號？-->
                        <span class="registerLink">已經(jīng)有賬號了？<a href="index.php">登錄</a></span>
                    </div>
                </div>
            </form>

Note: I want to display the entered full name in the welcome dashboard.