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PHP User Authentication System.php
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#PHP User Authentication System with MySQL (signup and login):
<?php
// Database connection
$host = 'localhost';
$user = 'root';
$password = '';
$dbname = 'user_db';
$conn = new mysqli($host, $user, $password, $dbname);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
// Signup
if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['signup'])) {
$username = $_POST['username'];
$password = password_hash($_POST['password'], PASSWORD_BCRYPT);
$sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
if ($conn->query($sql) === TRUE) {
echo "Signup successful!";
} else {
echo "Error: " . $conn->error;
}
}
// Login
if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['login'])) {
$username = $_POST['username'];
$password = $_POST['password'];
$sql = "SELECT * FROM users WHERE username='$username'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
$row = $result->fetch_assoc();
if (password_verify($password, $row['password'])) {
echo "Login successful!";
} else {
echo "Invalid password.";
}
} else {
echo "No user found.";
}
}
?>
<!-- HTML Form -->
<!DOCTYPE html>
<html>
<head>
<title>User Auth</title>
</head>
<body>
<h2>Signup</h2>
<form method="POST">
<input type="text" name="username" placeholder="Username" required>
<input type="password" name="password" placeholder="Password" required>
<button type="submit" name="signup">Signup</button>
</form>
<h2>Login</h2>
<form method="POST">
<input type="text" name="username" placeholder="Username" required>
<input type="password" name="password" placeholder="Password" required>
<button type="submit" name="login">Login</button>
</form>
</body>
</html>