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signup.php
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Twitter clone | Sign up </title>
<!-- Bootstrap styles cdn -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
</head>
<body>
<?php require_once 'header.php'; ?>
<div class="row my-5">
<div class="container col-3"></div>
<div class="container col-6">
<form action=<?php echo htmlspecialchars($_SERVER['PHP_SELF']); ?> method="post">
<div class="form-group">
<label for="username">Username</label>
<input type="text" class="form-control" name="username" id="username" placeholder="Enter username" required>
</div>
<div class="form-group">
<label for="password">Password</label>
<input type="password" class="form-control" name="password" id="password" required>
</div>
<button type="submit" class="btn btn-primary">Sign up</button>
</form>
<p class="mt-4">Already have an account? <a href="login.php">Log in</a></p>
</div>
<div class="container col-3"></div>
</div>
<?php
if (isset($_POST["username"]) && isset($_POST["password"])) {
$username = $_POST["username"];
$password = $_POST["password"];
// Query the database with the login values to create a new user into the database
$newUserQuery = "insert into users(username, password) values('$username', '$password');";
$response = $connect->query($newUserQuery);
if ($response == 1) {
$_SESSION["username"] = $username;
redirect('./index.php');
} else {
$message = 'The username is already in use';
include_once './components/alert.php';
}
}
?>
<!-- Bootstrap scripts -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
</body>
</html>