How can user input be securely handled in PHP forms?

User input in PHP forms can be securely handled by using functions like htmlspecialchars() to escape special characters and prevent XSS attacks. Additionally, input validation should be performed to ensure that the data entered by the user meets the expected format. Finally, using prepared statements with parameterized queries can help prevent SQL injection attacks. 

// Securely handle user input in PHP forms
$user_input = $_POST['user_input'];

// Escape special characters
$escaped_input = htmlspecialchars($user_input);

// Validate input format
if (filter_var($escaped_input, FILTER_VALIDATE_EMAIL)) {
    // Input is a valid email address
} else {
    // Input is not a valid email address
}

// Use prepared statements to prevent SQL injection
$stmt = $pdo->prepare("INSERT INTO users (email) VALUES (:email)");
$stmt->bindParam(':email', $escaped_input);
$stmt->execute();

Keywords

SQL injection XSS attacks htmlspecialchars filter_input validation

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