What is the best practice for retrieving user domain and username in PHP for comparison with a SQL table?

When retrieving user domain and username in PHP for comparison with a SQL table, it is best practice to sanitize and validate the input data to prevent SQL injection attacks. One way to do this is by using prepared statements with placeholders in the SQL query to securely pass the user input. Additionally, you can use PHP's filter_var function to validate the input data before using it in the SQL query. 

// Retrieve user domain and username
$userDomain = filter_var($_POST['user_domain'], FILTER_SANITIZE_STRING);
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);

// Validate user input
if (empty($userDomain) || empty($username)) {
    // Handle empty input error
}

// Prepare SQL query with placeholders
$sql = "SELECT * FROM users WHERE user_domain = ? AND username = ?";
$stmt = $pdo->prepare($sql);
$stmt->execute([$userDomain, $username]);

// Fetch results
$results = $stmt->fetchAll(PDO::FETCH_ASSOC);

// Use the results for comparison or further processing

Keywords

PHP user domain username comparison SQL table

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