What are some potential pitfalls to consider when using keyboard input in PHP programs?

One potential pitfall when using keyboard input in PHP programs is the risk of SQL injection attacks if user input is not properly sanitized. To prevent this, always use prepared statements or parameterized queries when interacting with a database to ensure that user input is treated as data rather than executable code. 

// Example of using prepared statements to prevent SQL injection

// Assuming $conn is the database connection object

// Prepare the SQL statement
$stmt = $conn->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);

// Set parameters and execute
$username = $_POST['username'];
$stmt->execute();

// Fetch results
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // Process results
}

// Close statement and connection
$stmt->close();
$conn->close();

Keywords

input validation user input security vulnerabilities SQL injection cross-site scripting

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