What are some common methods for securing files on a server with password protection using PHP?

Securing files on a server with password protection using PHP involves creating a login system where users must enter a username and password to access the files. This can be achieved by storing user credentials in a database, verifying the entered credentials against the database, and granting access only if the credentials match. 

<?php
session_start();

// Check if the user is already logged in
if(isset($_SESSION['username'])) {
    // Display the protected files here
    echo "Welcome, ".$_SESSION['username']."!";
} else {
    // If not logged in, show the login form
    if(isset($_POST['login'])) {
        $username = $_POST['username'];
        $password = $_POST['password'];
        
        // Verify the credentials against a database
        if($username == 'admin' && $password == 'password123') {
            $_SESSION['username'] = $username;
            echo "Login successful!";
        } else {
            echo "Invalid username or password.";
        }
    }
    ?>
    <form method="post">
        <input type="text" name="username" placeholder="Username">
        <input type="password" name="password" placeholder="Password">
        <button type="submit" name="login">Login</button>
    </form>
    <?php
}
?>

Keywords

file security password protection server PHP functions authentication

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