What are the potential pitfalls of not properly securing user input in PHP?

Not properly securing user input in PHP can lead to security vulnerabilities such as SQL injection, cross-site scripting (XSS), and remote code execution. To prevent these risks, it is essential to sanitize and validate user input before using it in any database queries or outputting it to the browser. 

$user_input = $_POST['user_input'];

// Sanitize user input
$sanitized_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Validate user input
if (strlen($sanitized_input) > 0) {
    // Proceed with using the sanitized input
    echo "User input: " . $sanitized_input;
} else {
    // Handle invalid input
    echo "Invalid input";
}

Keywords

SQL injection cross-site scripting input validation htmlspecialchars prepared statements

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