How can PHP developers ensure data security and integrity when retrieving and storing data from external sources using PHP scripts?

To ensure data security and integrity when retrieving and storing data from external sources using PHP scripts, developers can implement input validation, parameterized queries to prevent SQL injection, and use encryption techniques to protect sensitive data. 

// Example of implementing input validation and parameterized queries in PHP
$user_input = $_POST['user_input'];

// Input validation
if (!filter_var($user_input, FILTER_VALIDATE_EMAIL)) {
    // Handle invalid input
}

// Parameterized query to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM users WHERE email = :email");
$stmt->bindParam(':email', $user_input);
$stmt->execute();

Keywords

SQL injection data validation prepared statements encryption secure coding practices

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