What are some key considerations for securely updating data in a database using PHP?

When updating data in a database using PHP, it is important to sanitize user input to prevent SQL injection attacks. One way to do this is by using prepared statements with parameterized queries. Additionally, it is crucial to validate user input to ensure that only the expected data types and formats are being updated in the database. 

// Assume $conn is the database connection object

// Sanitize user input
$updatedData = filter_var($_POST['updated_data'], FILTER_SANITIZE_STRING);

// Prepare and execute a parameterized query
$stmt = $conn->prepare("UPDATE table SET column = :updatedData WHERE id = :id");
$stmt->bindParam(':updatedData', $updatedData, PDO::PARAM_STR);
$stmt->bindParam(':id', $_POST['id'], PDO::PARAM_INT);
$stmt->execute();

Keywords

SQL injection prepared statements PDO data validation encryption

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