What potential issues can arise when comparing session values with form input values in PHP?

When comparing session values with form input values in PHP, potential issues can arise due to the possibility of session values being manipulated or outdated. To solve this, it is important to validate and sanitize form input data before comparing it with session values to ensure data integrity and security. 

// Validate and sanitize form input data
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$password = filter_input(INPUT_POST, 'password', FILTER_SANITIZE_STRING);

// Compare form input values with session values
if ($username === $_SESSION['username'] && $password === $_SESSION['password']) {
    // Valid credentials, proceed with authentication
} else {
    // Invalid credentials, handle accordingly
}

Keywords

session values form input values comparison data validation type coercion

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