What security considerations should be taken into account when passing values from one PHP form to another for database querying?

When passing values from one PHP form to another for database querying, it is important to sanitize and validate the input to prevent SQL injection attacks. One way to do this is by using prepared statements with parameterized queries, which helps to separate the SQL query from the user input. 

// Sanitize and validate input from form
$value = filter_var($_POST['value'], FILTER_SANITIZE_STRING);

// Connect to database
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

// Prepare and execute parameterized query
$stmt = $pdo->prepare("SELECT * FROM mytable WHERE column = :value");
$stmt->bindParam(':value', $value, PDO::PARAM_STR);
$stmt->execute();

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

Keywords

SQL injection prepared statements data validation cross-site scripting encryption.

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