我已经构建了登录系统，我希望在用户登录时显示用户名和名字 [英] I already build login system and I want to display username and first name when user logged in
问题描述
这些代码没有显示任何错误，但我没有收到用户名
function display_username（）{
// 启动会话
// 3。如果表单已提交。
// 3.1如果提交表单
if （isset（$ _ POST [' username']）和 isset（$ _ POST [' 密码']））{
// 3.1.1分配已发布值变量。
// 3.1.2检查值是否存在是否在数据库中
$ query = SELECT * FROM`users` WHERE username ='$ username'和password ='$ password';
$ result = mysqli_query（$ connection，$ query）或 die（ mysqli_error（$连接））;
$ count = mysqli_num_rows（$ result）;
// 3.1.2如果发布的值等于数据库值，则会创建会话用户。
// if（$ count == 1）{
$ _SESSION [' username'] = $用户名;
// } else {
// 3.1.3如果登录凭据不匹配，将显示错误消息。
// $ fmsg =无效的登录凭证。;
// }
// }
// 3.1.4如果用户已登录用消息向用户致意
if （isset（$ _ SESSION [' username']））{
$ username = $ _SESSION [' 用户名'];
echo Hayyyyyy 。 $ username 。
;}
}
}
/ ****** **********注册用户功能******************** /
function register_user（$ first_name，$ last_name，$ username，$ email，$ password）{
$ first_name = escape（$ first_name）;
$ last_name = escape（$ last_name）;
$ username = escape（$ username）;
$ email = escape（$ email）;
$ password = escape（$ password）;
if（email_exists（$ email））{
return false;
} else if （username_exists（$ username）） {
return false;
} else {
$ password = MD5（$密码）;
$ validation_code = md5（$ username。microtime（））;
$ sql = INSERT INTO用户（first_name，last_name，username，email，password，validation_code，active）;
$ sql。= VALUES（'$ first_name'，'$ last_name'，'$ username'， '$ email'，'$ password'，'$ validation_code'，0）;
$ result = query（$ sql）;
确认（$ result）;
$ subject = 激活帐户;
$ msg = 请点击链接以下激活您的账户
http://omilearn.com/activate.php?email=$email&code=$validation_code
;
$ headers = 来自：noreply@omilearn.com;
send_email（$ email，$ subject，$ msg，$ headers）;
return true;
}
}
< pre lang =PHP> < pre lang = PHP < span class =code-keyword>>
/ ****************验证函数********* *********** /
function validate_user_registration（）{< br $>
$ errors = [];
$ min = 3;
$ max = 20;
// if（$ _ SERVER ['REQUEST_METHOD'] == POST）{
if（isset（$ _ POST ['register-submit']））{
$ first_name = clean（ $ _POST ['first_name']）;
$ last_name = clean（$ _ POST ['last_name']）;
$ username = clean（$ _ POST ['username' ]）;
$ email = clean（$ _ POST ['e mail']）;
$ password = clean（$ _ POST ['password']）;
$ confirm_password = clean（$ _ POST ['confirm_password']）; < br $> b $ b
if（strlen（$ first_name）< $ min）{
$ errors [] =你的名字不能少于{$ min}个字符;
}
if（strlen（$ first_name）> $ max）{
$ errors [] =你的名字不能超过{$ max}个字符;
}
if（strlen（$ last_name）< $ min）{
$ errors [] =你的姓氏不能少于{$ min}字符;
}
if（strlen（$ last_name）> $ max）{
$错误[] =你的姓氏不能超过{$ max}个字符;
}
if（strlen（$ username）< $ min）{
$ errors [] =你的用户名不能少于{$ min}个字符; < br $> b $ b
}
if（strlen（$ username）> $ max）{
$ errors [] =您的用户名不能超过{$ max}个字符;
}
if（username_exists（$ username））{
$ errors [] =抱歉，用户名已被占用;
$ / b $ b $
if（email_exists（$ email） ）{
$ errors [] =很抱歉，电子邮件已经注册;
} < br $>
if（strlen（$ email）< $ min）{
$ errors [] =您的电子邮件不能超过{$ max}个字符;
}
if（$ password！== $ confirm_password）{
$ errors [] =您的密码字段不匹配;
}
if（！empty（$ errors））{
foreach（$ errors as $ error）{
echo validation_errors（$ error）;
}
}否则{
if（register_user（ $ first_name，$ last_name，$ username，$ email，$ password））{
set_message （
请检查您的电子邮件或垃圾邮件文件夹以获取激活链接
）;redirect（ index.php）;
}否则{
set_message（
抱歉，我们无法注册用户
）;redirect（index.php）;
}
}
} //发布请求
} //功能
我的尝试：
i尝试了很多代码但没有工作
<？php display_username（'$ username'）; ？>
<？php $ _SESSION ['用户名']？>
<？php
session_start（）; < br $>
echo $ _SESSION ['username']; ？> ;;
函数display_username（）{
$ query = mysqli_query（$ con，' SELECT username FROM users WHERE users =$ _ SESSION ['username']'）;
$ fetch = mysqli_fetch_assoc（$ con，$ query）;
$ userNameToShow = $ fetch ['username'];
}
<？php display_username（）？>
if （isset（$ _ SESSION ['email']）
_POST [' 用户名']）和 isset（
_POST [' password']））{
// 3.1.1将过帐的值分配给变量。
// 3.1.2检查值是e数据库中的xisting是否
query = SELECT * FROM`users` WHERE username ='
these code doesnt show any error but i am not getting username
function display_username() {
//Start the Session
//3. If the form is submitted or not.
//3.1 If the form is submitted
if (isset($_POST['username']) and isset($_POST['password'])){
//3.1.1 Assigning posted values to variables.
//3.1.2 Checking the values are existing in the database or not
$query = "SELECT * FROM `users` WHERE username='$username' and password='$password'";
$result = mysqli_query($connection, $query) or die(mysqli_error($connection));
$count = mysqli_num_rows($result);
//3.1.2 If the posted values are equal to the database values, then session will be created for the user.
//if ($count == 1){
$_SESSION['username'] = $username;
//}else{
//3.1.3 If the login credentials doesn't match, he will be shown with an error message.
//$fmsg = "Invalid Login Credentials.";
//}
//}
//3.1.4 if the user is logged in Greets the user with message
if (isset($_SESSION['username'])){
$username = $_SESSION['username'];
echo "Hayyyyyy" . $username . "
";}
}
}
/****************Register user functions ********************/
function register_user($first_name, $last_name, $username, $email, $password) {
$first_name = escape($first_name);
$last_name = escape($last_name);
$username = escape($username);
$email = escape($email);
$password = escape($password);
if(email_exists($email)) {
return false;
} else if (username_exists($username)) {
return false;
} else {
$password = md5($password);
$validation_code = md5($username . microtime());
$sql = "INSERT INTO users(first_name, last_name, username, email, password, validation_code, active)";
$sql.= " VALUES('$first_name','$last_name','$username','$email','$password','$validation_code', 0)";
$result = query($sql);
confirm($result);
$subject = "Activate Account";
$msg = " Please click the link below to activate your Account
http://omilearn.com/activate.php?email=$email&code=$validation_code
";
$headers = "From: noreply@omilearn.com";
send_email($email, $subject, $msg, $headers);
return true;
}
}
<pre lang="PHP">/****************Validation functions ********************/
function validate_user_registration(){
$errors = [];
$min = 3;
$max = 20;
// if($_SERVER['REQUEST_METHOD'] == "POST") {
if (isset($_POST['register-submit'])) {
$first_name = clean($_POST['first_name']);
$last_name = clean($_POST['last_name']);
$username = clean($_POST['username']);
$email = clean($_POST['email']);
$password = clean($_POST['password']);
$confirm_password = clean($_POST['confirm_password']);
if(strlen($first_name) < $min) {
$errors[] = "Your first name cannot be less than {$min} characters";
}
if(strlen($first_name) > $max) {
$errors[] = "Your first name cannot be more than {$max} characters";
}
if(strlen($last_name) < $min) {
$errors[] = "Your Last name cannot be less than {$min} characters";
}
if(strlen($last_name) > $max) {
$errors[] = "Your Last name cannot be more than {$max} characters";
}
if(strlen($username) < $min) {
$errors[] = "Your Username cannot be less than {$min} characters";
}
if(strlen($username) > $max) {
$errors[] = "Your Username cannot be more than {$max} characters";
}
if(username_exists($username)){
$errors[] = "Sorry that username is already is taken";
}
if(email_exists($email)){
$errors[] = "Sorry that email already is registered";
}
if(strlen($email) < $min) {
$errors[] = "Your email cannot be more than {$max} characters";
}
if($password !== $confirm_password) {
$errors[] = "Your password fields do not match";
}
if(!empty($errors)) {
foreach ($errors as $error) {
echo validation_errors($error);
}
} else {
if(register_user($first_name, $last_name, $username, $email, $password)) {
set_message("
Please check your email or spam folder for activation link
");redirect("index.php");
} else {
set_message("
Sorry we could not register the user
");redirect("index.php");
}
}
} // post request
} // function
What I have tried:
i tried many codes but didnt work
<?php display_username('$username'); ?>
<?php $_SESSION['username'] ?>
<?php
session_start();
echo $_SESSION['username']; ?>;
function display_username() {
$query=mysqli_query($con, ‘SELECT username FROM users WHERE users="$_SESSION[‘username’]"’);
$fetch=mysqli_fetch_assoc($con, $query);
$userNameToShow = $fetch[‘username’];
}
<?php display_username() ?>
if(isset($_SESSION['email'])
_POST['username']) and isset(
_POST['password'])){ //3.1.1 Assigning posted values to variables. //3.1.2 Checking the values are existing in the database or not
query = "SELECT * FROM `users` WHERE username='
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