When implementing user authentication in PHP to display specific table data, what security measures should be taken to prevent unauthorized access or data manipulation?

To prevent unauthorized access or data manipulation when implementing user authentication in PHP, you should use secure password hashing techniques, validate user input to prevent SQL injection attacks, and implement proper session management to control user access to specific data. 

<?php
session_start();

// Check if user is authenticated
if(!isset($_SESSION['authenticated']) || $_SESSION['authenticated'] !== true) {
    header('Location: login.php');
    exit;
}

// Retrieve specific table data based on user's role or permissions
if($_SESSION['role'] === 'admin') {
    // Display admin-specific data
} else {
    // Display user-specific data
}
?>

Keywords

SQL injection password hashing session management CSRF protection input validation

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