What are common challenges faced by PHP beginners when implementing a login script?

One common challenge faced by PHP beginners when implementing a login script is securely storing passwords. It is important to hash passwords using a strong hashing algorithm like bcrypt to protect user data in case of a data breach. Additionally, beginners may struggle with validating user input and preventing SQL injection attacks. 

// Example of securely hashing a password using bcrypt
$password = "secretPassword123";
$hashedPassword = password_hash($password, PASSWORD_BCRYPT);

// Example of validating user input and preventing SQL injection
$username = mysqli_real_escape_string($conn, $_POST['username']);
$password = mysqli_real_escape_string($conn, $_POST['password']);

// Query to check if username and hashed password match in the database
$query = "SELECT * FROM users WHERE username='$username'";
$result = mysqli_query($conn, $query);

if ($row = mysqli_fetch_assoc($result)) {
    if (password_verify($password, $row['password'])) {
        // Login successful
    } else {
        // Incorrect password
    }
} else {
    // Username not found
}

Keywords

Authentication PHP sessions password hashing form validation SQL injection

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