I have a login form through which a user can login to the website. I am checking whether the username and password match or not. If it matches, the user will be redirected to the Website, but if it doesn't match, an error message will be shown on the upper part of a form.
For this, I am storing the error message in a variable and then printing it to the upper part of the form. But it is not getting the value of the variable. Codes are as follows:
<?php
$link = mysqli_connect("localhost", "root", "", "youtube_project");
?>
<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title>Login Form</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<div class="login">
<div class="login-triangle"></div>
<h2 class="login-header">Log in</h2>
<form class="login-container" name="form1" action="" method="post">
<p style="color:red;"><?php if(isset($msg)){ echo $msg; } //Printing error msg, but couldn't get it ?></p>
<p><input type="text" placeholder="Username" name="username" required></p>
<p><input type="password" placeholder="Password" name="pwd" required></p>
<p><input type="submit" name="submit1" value="Log in"></p>
</form>
</div>
<script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>
<?php
if(isset($_POST['submit1'])){
$username = mysqli_real_escape_string($link, $_POST['username']);
$pwd = mysqli_real_escape_string($link, $_POST['pwd']);
$sql = mysqli_query($link, "SELECT * FROM admin_login WHERE username='$username' && password='$pwd'");
if(mysqli_num_rows($sql) >= 1){
?>
<script type="text/javascript">
window.location="demo.php";
</script>
<?php
} else {
$msg = "Invalid Username/Password combination"; //Storing error msg
}
}
?>
</body>
</html>
