In the context of PHP login scripts, what are common pitfalls that may lead to session-related problems like disappearing buttons?

Common pitfalls that may lead to session-related problems like disappearing buttons in PHP login scripts include not properly starting the session, not setting session variables correctly, or not checking for an active session before displaying certain elements on the page. To solve this issue, ensure that the session is started at the beginning of each page that requires session variables, set session variables after successful login, and check for an active session before displaying any elements that rely on session data. 

<?php
// Start the session
session_start();

// Set session variables after successful login
$_SESSION['username'] = 'example_user';

// Check for an active session before displaying elements
if(isset($_SESSION['username'])) {
    // Display buttons or elements that require session data
    echo '<button>Logout</button>';
} else {
    // Display login form or message
    echo '<form action="login.php" method="post">
            <input type="text" name="username" placeholder="Username">
            <input type="password" name="password" placeholder="Password">
            <button type="submit">Login</button>
          </form>';
}
?>

Keywords

PHP login scripts session disappearing buttons troubleshooting

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